Herb & supplement monograph

Diosmin Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated July 2026
What is this page for?

First and foremost: how Diosmin interacts with medications. The heart of this page is the interaction list — every drug Diosmin is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Diosmin is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Diosmin Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Diosmin drug interaction appears low to moderate for most people, since no interaction is rated major. Every listed interaction is rated moderate, and many rest on theory about how diosmin may affect the enzymes and transporters the body uses to clear medications.

Interactions deserving the most attention

The best-documented concern is carbamazepine, a seizure medicine. A human study found diosmin raised its blood levels and slowed its clearance, which could matter for seizure control. Similar human studies showed higher levels of diclofenac, chlorzoxazone, and fexofenadine when taken after diosmin. There is also one report of serious bleeding in an older woman taking warfarin, aspirin, and diosmin together, so people on blood thinners deserve extra care even though that evidence is limited.

What the rest of the list means

The long list of interacting medications mostly comes from a few broad drug-processing pathways that diosmin may inhibit, so a medication can appear on it based on theory alone. Lab findings even conflict for one of these pathways. Only a handful of medicines have actually been studied with diosmin in people, and the observed changes were moderate, not dangerous.

Check your medications against Diosmin

Based on HelloPharmacist’s Diosmin interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Diosmin

884 medications have a known interaction with Diosmin, graded by severity. Select any drug for the full evidence-based detail.

2,830 drugs
Ado-trastuzumab EmtansineKadcyla
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Ado-trastuzumab Emtansine interaction Ado-trastuzumab Emtansine drug page: uses, dosage & side effects
AbciximabReoPro
Moderate Anticoagulant/antiplatelet Drugs

Theoretically, diosmin may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.

Read the full Diosmin + Abciximab interaction
AbemaciclibVerzenio
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Abemaciclib interaction Abemaciclib drug page: uses, dosage & side effects
Abiraterone
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Abiraterone interaction Abiraterone drug page: uses, dosage & side effects
Abiraterone AcetateYonsa, Zytiga
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Abiraterone Acetate interaction Abiraterone Acetate drug page: uses, dosage & side effects
AbrocitinibCibinqo
Moderate Anticoagulant/antiplatelet Drugs

Theoretically, diosmin may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.

Read the full Diosmin + Abrocitinib interaction Abrocitinib drug page: uses, dosage & side effects
AcalabrutinibCalquence
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acalabrutinib interaction Acalabrutinib drug page: uses, dosage & side effects
AcenocoumarolSintrom
Moderate Anticoagulant/antiplatelet Drugs

Theoretically, diosmin may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.

Read the full Diosmin + Acenocoumarol interaction
AcetaminophenChildren's Tylenol, Children's Tylenol Meltaways, Tylenol, Tylenol Ex Strength
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen interaction Acetaminophen drug page: uses, dosage & side effects
Acetaminophen, AspirinGemnisyn
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Aspirin interaction
Acetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
Moderate Anticoagulant/antiplatelet Drugs

Theoretically, diosmin may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.

Read the full Diosmin + Acetaminophen, Aspirin, Caffeine interaction
Acetaminophen, Brompheniramine, PhenylpropanolamineDimetapp Cold and Flu
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Brompheniramine, Phenylpropanolamine interaction
Acetaminophen, ButalbitalAxocet, Bancap, Bucet, Butex Forte, Esgic CF, Orbivan CF +5 more
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Butalbital interaction
Acetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Butalbital, Caffeine interaction Acetaminophen, Butalbital, Caffeine drug page: uses, dosage & side effects
Acetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Butalbital, Caffeine, Codeine interaction
Acetaminophen, Butalbital, CodeineBancap w/ Codeine
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Butalbital, Codeine interaction
Acetaminophen, Butalbital, Codeine PhosphatePhrenilin #3
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Butalbital, Codeine Phosphate interaction
Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, PhenylephrineHycomine Compound
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interaction
Acetaminophen, Caffeine, CodeineGesic C15, Gesic C30, Gesic C8, Lenoltec 1, Lenoltec 2, Lenoltec 3 +1 more
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Codeine interaction
Acetaminophen, Caffeine, Codeine, SalicylamideCodalan No.1, Codalan No.2, Codalan No.3
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Codeine, Salicylamide interaction
Acetaminophen, Caffeine, DihydrocodeineDHC Plus, Panlor DC, Panlor SS
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Dihydrocodeine interaction
Acetaminophen, Caffeine, IsomethepteneMigralam
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Isometheptene interaction
Acetaminophen, Caffeine, PyrilamineMidol Max Strength Menstrual
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Caffeine, Pyrilamine interaction
Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan HbrVicks Formula 44M Cough, Cold & Flu Relief
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine Maleate, Dextromethorphan Hbr interaction
Acetaminophen, Chlorpheniramine, Codeine, PhenylephrineColrex
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Codeine, Phenylephrine interaction
Acetaminophen, Chlorpheniramine, DextromethorphanCoricidin II Extra Strength Cold and Flu
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Dextromethorphan interaction
Acetaminophen, Chlorpheniramine, Dextromethorphan HydrobromideCoricidin HBP Maximum Strength Flu
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Dextromethorphan Hydrobromide interaction
Acetaminophen, Chlorpheniramine, Dextromethorphan, PhenylpropanolamineMulti Symptom Cold Relief
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Dextromethorphan, Phenylpropanolamine interaction
Acetaminophen, Chlorpheniramine, Dextromethorphan, PseudoephedrineChildren's Tylenol Cold Plus Cough, Tylenol Cold Ex Strength
Moderate Cytochrome P450 3a4 (cyp3a4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Dextromethorphan, Pseudoephedrine interaction
Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, SalicylamideRhinogesic GG
Moderate Cytochrome P450 2e1 (cyp2e1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.

Read the full Diosmin + Acetaminophen, Chlorpheniramine, Guaifenesin, Phenylephrine, Salicylamide interaction
Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Diosmin combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
The big picture

The kinds of drugs Diosmin affects

Every type of medication (drug category) Diosmin is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 9 drug categories Diosmin interacts with
Anticoagulant/antiplatelet DrugsCarbamazepine (tegretol)Chlorzoxazone (parafon Forte, Paraflex)Cytochrome P450 2c9 (cyp2c9) SubstratesCytochrome P450 2e1 (cyp2e1) SubstratesCytochrome P450 3a4 (cyp3a4) SubstratesDiclofenac (voltaren, Others)Fexofenadine (allegra)P-glycoprotein Substrates
Anticoagulant/Antiplatelet Drugs

Theoretically, diosmin may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
A case of spontaneous intraventricular hemorrhage has been reported for a 77-year-old female after 6 weeks of warfarin therapy, despite an international normalized ratio (INR) of only 1.8. The patient had also been taking aspirin and diosmin for several years. Experts speculate that chronic intake of diosmin predisposed the patient to spontaneous intraventricular hemorrhage by inducing chronic microcirculatory hypertension and inhibiting platelet aggregation. The presence of aspirin was also thought to play a role in this event.

Likelihood Possible Evidence D
Carbamazepine (Tegretol)

Theoretically, diosmin might reduce the effects of carbamazepine and increase the risk for convulsions.
A pharmacokinetic study in humans shows that taking diosmin (Venex) 500 mg daily for 10 days prior to oral administration of carbamazepine 200 mg increases blood levels of carbamazepine by approximately 58% and decreases carbamazepine clearance by 42%. It also decreases the formation of carbamazepine's active metabolite. It is speculated that diosmin reduces the metabolism of carbamazepine by inhibiting cytochrome P450 3A4 (CYP3A4).

Likelihood Probable Evidence B
Chlorzoxazone (Parafon Forte, Paraflex)

Theoretically, diosmin might increase the levels and clinical effects of chlorzoxazone.
A pharmacokinetic study in humans shows that taking diosmin (Venex 500) 500 mg daily for 9 days prior to oral administration of chlorzoxazone 250 mg increases blood levels of chlorzoxazone by 53% and decreases chlorzoxazone clearance by 40%. It is speculated that diosmin reduces the metabolism of chlorzoxazone by inhibiting cytochrome P450 2E1 (CYP2E1).

Likelihood Probable Evidence B
Cytochrome P450 2C9 (Cyp2C9) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2C9 substrates.
Diclofenac is metabolized by CYP2C9 enzymes. Clinical and laboratory research shows that diosmin inhibits the metabolism of diclofenac. A pharmacokinetic study in humans shows that taking diosmin (Venex 500) 500 mg daily for 9 days prior to oral administration of diclofenac 100 mg increases blood levels of diclofenac and decreases diclofenac clearance.

Likelihood Possible Evidence D
Cytochrome P450 2E1 (Cyp2E1) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP2E1 substrates.
Chlorzoxazone is metabolized by CYP2E1 enzymes. A pharmacokinetic study in humans shows that taking diosmin (Venex 500) 500 mg daily for 9 days prior to oral administration of chlorzoxazone (Paraflex 250) 250 mg increases blood levels of chlorzoxazone by 34% and decreases chlorzoxazone clearance by 40%. It is speculated that diosmin reduces the metabolism of chlorzoxazone by inhibiting CYP2E1.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.
Laboratory research is conflicting with respect to the effects of diosmin on CYP3A4. Some research suggests that diosmin does not affect CYP3A4 activity. However, other research suggests that diosmin alters the metabolism of carbamazepine, a CYP3A4 substrate. Laboratory and animal research show that oral administration of diosmin for 7 days prior to oral administration of carbamazepine increases plasma concentrations of carbamazepine, decreases the clearance of carbamazepine, and decreases the formation of carbamazepine's active metabolite. Additionally, pharmacokinetic research in healthy male subjects shows that taking diosmin (Venex) 500 mg daily for 10 days prior to oral administration of carbamazepine 200 mg increases blood levels of carbamazepine by approximately 58% and decreases carbamazepine clearance by 42%. It is speculated that diosmin reduces the metabolism of carbamazepine by inhibiting CYP3A4. Diosmetin, a metabolite of diosmin, may also inhibit CYP3A4.

Likelihood Possible Evidence B
Diclofenac (Voltaren, Others)

Theoretically, diosmin might increase the levels and clinical effects of diclofenac.
Clinical and laboratory research shows that diosmin inhibits the metabolism of diclofenac. A pharmacokinetic study in humans shows that taking diosmin (Venex 500) 500 mg daily for 9 days prior to oral administration of diclofenac 100 mg increases blood levels of diclofenac and decreases diclofenac clearance. It is speculated that diosmin reduces the metabolism of diclofenac by inhibiting cytochrome P450 2C9 (CYP2C9).

Likelihood Probable Evidence B
Fexofenadine (Allegra)

Theoretically, diosmin might increase the levels and clinical effects of fexofenadine.
A pharmacokinetic study in humans shows that taking diosmin (Venex) 500 mg daily for 10 days prior to oral administration of fexofenadine 120 mg increases blood levels of fexofenadine by approximately 49% and decreases the apparent oral clearance of fexofenadine by 41%. The time taken to reach maximum plasma concentration, the half-life, and the apparent renal clearance of fexofenadine are not affected. For this reason, it is speculated that diosmin alters the pharmacokinetics of fexofenadine via inhibition of P-glycoprotein in the intestine, but not in the kidney or liver.

Likelihood Probable Evidence B
P-Glycoprotein Substrates

Theoretically, diosmin might increase levels of drugs that are substrates of P-glycoprotein (P-gp).
Preliminary laboratory research suggests that diosmin inhibits P-gp. Additionally, pharmacokinetic research in healthy male subjects shows that taking diosmin (Venex) 500 mg daily for 10 days prior to oral administration of fexofenadine 120 mg increases blood levels of fexofenadine, a P-gp substrate, by approximately 49% and decreases the apparent oral clearance of fexofenadine by 41%. The time taken to reach maximum plasma concentration, the half-life, and the apparent renal clearance of fexofenadine are not affected. For this reason, it is speculated that diosmin inhibits P-gp in the intestine, but not in the kidney or liver.

Likelihood Possible Evidence D
Monograph

Diosmin: Uses, Safety & Side Effects

Medically reviewed by · Reviewed July 2026 ·
The bottom line

Diosmin is a citrus-derived flavonoid most often used for vein-related problems such as chronic venous insufficiency and hemorrhoids, and it is usually combined with a related flavonoid called hesperidin. Some studies suggest it may help relieve leg swelling and hemorrhoid symptoms, but quality varies. Talk to your pharmacist or doctor before starting it, especially if you are pregnant or breastfeeding.

Part used
A flavonoid derived from citrus fruit peels (often made from hesperidin)
Common forms
Tablets, capsules (often combined with hesperidin)
People commonly use it for
  • Chronic venous insufficiency
  • Hemorrhoids
  • Leg swelling and heaviness
  • Varicose veins
  • Spider veins

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallUse caution

Generally well tolerated short-term, but long-term safety is less well studied.

PregnancyLikely Safe

When used orally in amounts found in foods.

Read the full pregnancy detail
BreastfeedingLikely Safe

When used orally in amounts found in foods.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Diosmin is a plant compound called a flavonoid. It is found naturally in some citrus fruits and is usually made commercially from the peels of oranges or other citrus, often by converting a related flavonoid called hesperidin.

It is most often sold as a supplement or, in some countries, as a prescription medicine for vein problems. Many products combine diosmin with hesperidin in a mixture sometimes labeled as a "micronized purified flavonoid fraction."

People most commonly take diosmin to support healthy blood flow in the legs and to ease symptoms tied to veins, such as swelling, heaviness, and hemorrhoids.

How it works

Diosmin is thought to work mainly by improving the tone and strength of vein walls and by reducing leakiness of small blood vessels. This may help blood and fluid move better and reduce swelling.

Laboratory and animal studies suggest it may also reduce inflammation, protect the lining of blood vessels, and improve lymph flow. Some research suggests it has antioxidant effects as well.

It is important to know that many of these proposed mechanisms come from laboratory and animal research, and how strongly they apply in the human body is not fully understood.

Effectiveness

Does Diosmin work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 14 uses evaluated
3 Possibly effective 11 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.
Possibly Effective Chronic venous insufficiency (CVI)
Rating & evidence shown verbatim from Natural Medicines

Oral diosmin, as part of a micronized purified flavonoid fraction, seems to be beneficial for reducing symptoms of CVI. It is unclear if oral diosmin alone is beneficial.

Possibly Effective Hemorrhoids
Rating & evidence shown verbatim from Natural Medicines

Oral diosmin, as part of a micronized purified flavonoid fraction or in combination with other compounds, seems to be beneficial for hemorrhoids.

Possibly Effective Venous leg ulcers
Rating & evidence shown verbatim from Natural Medicines

Oral diosmin, as part of a micronized purified flavonoid fraction, seems to be beneficial for venous leg ulcers.

Also studied for 11 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Back pain
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin is beneficial for back pain.

Insufficient Reliable Evidence To Rate Chronic prostatitis and chronic pelvic pain syndrome (CP/CPPS)
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction, is beneficial for CPPS.

Insufficient Reliable Evidence To Rate Coronary artery bypass graft (CABG) surgery
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction, is beneficial for patients undergoing CABG surgery.

Insufficient Reliable Evidence To Rate Diabetes
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction or in combination with other compounds, is beneficial for diabetes.

Insufficient Reliable Evidence To Rate Diabetic neuropathy
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin is beneficial for diabetic neuropathy.

Insufficient Reliable Evidence To Rate Lymphedema
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction or in combination with other compounds, is beneficial for lymphedema.

Insufficient Reliable Evidence To Rate Metabolic syndrome
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin is beneficial for metabolic syndrome.

Insufficient Reliable Evidence To Rate Minor bleeding
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction, is beneficial for minor bleeding.

Insufficient Reliable Evidence To Rate Ovarian hyperstimulation syndrome
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin is beneficial for reducing the occurrence of ovarian hyperstimulation syndrome.

Insufficient Reliable Evidence To Rate Varicose veins
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin, as part of a micronized purified flavonoid fraction, is beneficial for varicose veins.

Insufficient Reliable Evidence To Rate Venous thromboembolism (VTE)
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral diosmin is beneficial for prevention of VTE.

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

Diosmin appears to be generally well tolerated when taken by mouth for short periods. However, its long-term safety has not been thoroughly studied.

People with stomach or bowel sensitivity may notice digestive upset. If you have a medical condition or take other medicines, check with your pharmacist or doctor first.

For pregnancy, there is not enough reliable safety information, so diosmin should be used only if a doctor advises it. For breastfeeding, information is also lacking, so it is safer to avoid it. As with any supplement, talk to a healthcare professional before starting.

Side effects

Most reported side effects are mild. They can include stomach upset, nausea, diarrhea, and headache. Some people may notice dizziness or skin reactions.

Serious side effects appear to be uncommon, but because supplements are not tightly regulated, product quality can vary. Stop taking diosmin and seek medical care if you have signs of an allergic reaction, such as rash, itching, swelling, or trouble breathing.

Diosmin: Reported Adverse Effects

Documented safety reports on Diosmin from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Orally, diosmin is generally well tolerated.

Most Common Adverse Effects:

Orally: Abdominal pain, diarrhea, dizziness, gastritis, nausea, skin inflammation, and skin redness.

Serious Adverse Effects (Rare):

Orally: Cardiac arrhythmias and hemolytic anemia.

Reports by condition
Anemia Hematologic

Orally, diosmin can cause hemolytic anemia.

  1. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
Arrhythmia Cardiovascular

Orally, diosmin can cause cardiac arrhythmias.

  1. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
  2. Steinbruch M, Nunes C, Gama R, et al. Is nonmicronized diosmin 600?mg as effective as micronized diosmin 900?mg plus hesperidin 100?mg on chronic venous disease symptoms? Results of a noninferiority study. Int J Vasc Med. 2020;2020:4237204.
Cluster headache Neurologic/CNS

Orally, diosmin can cause headache, low energy, and dizziness in some patients.

  1. Misra MC, Parshad R. Randomized clinical trial of micronized flavonoids in the early control of bleeding from acute internal haemorrhoids. Br J Surgery 2000;87:868-72.
  2. Thanapongsathorn W, Vajrabukka T. Clinical trial of oral diosmin (Daflon) in the treatment of hemorrhoids. Dis Colon Rectum 1992;35:1085-8.
  3. Cospite M. Double-blind, placebo-controlled evaluation of clinical activity and safety of Daflon 500 mg in the treatment of acute hemorrhoids. Angiology 1994;45:566-73.
  4. Guilhou JJ, Dereure O, Marzin L, et al. Efficacy of Daflon 500 mg in venous leg ulcer healing: a double-blind, randomized, controlled versus placebo trial in 107 patients. Angiology 1997;48:77-85..
  5. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
  6. Steinbruch M, Nunes C, Gama R, et al. Is nonmicronized diosmin 600?mg as effective as micronized diosmin 900?mg plus hesperidin 100?mg on chronic venous disease symptoms? Results of a noninferiority study. Int J Vasc Med. 2020;2020:4237204.
  7. Mansilha A, Caldevilla H, Puskás A, Lucien A, Roby L, Kirienko A. MPFF 1000 mg chewable once daily vs. MPFF 500 mg twice daily in chronic venous disease: the double-blind, randomized, non-inferiority CHEWY trial. Int Angiol 2022;41(6):464-475.
Diarrhea Gastrointestinal

Orally, diosmin can cause gastrointestinal side effects, including abdominal pain, diarrhea, nausea, flatulence, and gastritis. In one case, exacerbation of chronic colopathy was reported after taking a specific diosmin-containing product (Daflon 500, Les Laboratoires Servier).

  1. Misra MC, Parshad R. Randomized clinical trial of micronized flavonoids in the early control of bleeding from acute internal haemorrhoids. Br J Surgery 2000;87:868-72.
  2. Thanapongsathorn W, Vajrabukka T. Clinical trial of oral diosmin (Daflon) in the treatment of hemorrhoids. Dis Colon Rectum 1992;35:1085-8.
  3. Cospite M. Double-blind, placebo-controlled evaluation of clinical activity and safety of Daflon 500 mg in the treatment of acute hemorrhoids. Angiology 1994;45:566-73.
  4. Guilhou JJ, Dereure O, Marzin L, et al. Efficacy of Daflon 500 mg in venous leg ulcer healing: a double-blind, randomized, controlled versus placebo trial in 107 patients. Angiology 1997;48:77-85..
  5. Cospite, M. and Dominici, A. Double blind study of the pharmacodynamic and clinical activities of 5682 SE in venous insufficiency. Advantages of the new micronized form. Int Angiol. 1989;8(4 Suppl):61-65.
  6. Buckshee, K., Takkar, D., and Aggarwal, N. Micronized flavonoid therapy in internal hemorrhoids of pregnancy. Int J Gynaecol Obstet 1997;57(2):145-151.
  7. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
  8. Gavrilov SG, Karalkin AV, Moskalenko YP, Grishenkova AS. Efficacy of two micronized purified flavonoid fraction dosing regimens in the pelvic venous pain relief. Int Angiol. 2021;40(3):180-186.
  9. Steinbruch M, Nunes C, Gama R, et al. Is nonmicronized diosmin 600?mg as effective as micronized diosmin 900?mg plus hesperidin 100?mg on chronic venous disease symptoms? Results of a noninferiority study. Int J Vasc Med. 2020;2020:4237204.
  10. Schastlivtsev I, Lobastov K, Barinov V, Kanzafarova I. Diosmin 600 in adjunction to rivaroxaban reduces the risk of post-thrombotic syndrome after femoropopliteal deep vein thrombosis: results of the RIDILOTT DVT study. Int Angiol. 2020;39(5):361-371.
  11. Mansilha A, Caldevilla H, Puskás A, Lucien A, Roby L, Kirienko A. MPFF 1000 mg chewable once daily vs. MPFF 500 mg twice daily in chronic venous disease: the double-blind, randomized, non-inferiority CHEWY trial. Int Angiol 2022;41(6):464-475.
Pain Musculoskeletal

Orally, one case report of muscle pain was thought to be related to diosmin use.

  1. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
Urticaria Dermatologic

Orally, diosmin can cause skin redness, hives, itchiness, and inflammation.

  1. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no single official dose of diosmin for supplement use. It is often sold combined with hesperidin in standardized products, and the right amount can depend on the condition and the specific product.

The best approach is to follow the directions on the product label and check with your pharmacist or doctor before starting. Do not assume that taking more will work better or be safer.

Pregnancy & Breastfeeding

Diosmin & Pregnancy

Likely Safe

When used orally in amounts found in foods.

Possibly Safe

When used orally in doses of up to 900 mg daily for 30 days in combination with other flavonoids, such as hesperidin. Some evidence suggests that taking this combination may be associated with placental insufficiency when used during the third trimester of pregnancy; however, the combination does not seem to induce fetal abnormalities, retard fetal growth, increase the risk of intrauterine death, or affect birth weight. Also, when breastfeeding, this combination does not seem to affect infant growth or feeding.

  1. Buckshee, K., Takkar, D., and Aggarwal, N. Micronized flavonoid therapy in internal hemorrhoids of pregnancy. Int J Gynaecol Obstet 1997;57(2):145-151.

Diosmin & Breastfeeding

Likely Safe

When used orally in amounts found in foods.

Possibly Safe

When used orally in doses of up to 900 mg daily for 30 days in combination with other flavonoids, such as hesperidin. Some evidence suggests that taking this combination may be associated with placental insufficiency when used during the third trimester of pregnancy; however, the combination does not seem to induce fetal abnormalities, retard fetal growth, increase the risk of intrauterine death, or affect birth weight. Also, when breastfeeding, this combination does not seem to affect infant growth or feeding.

  1. Buckshee, K., Takkar, D., and Aggarwal, N. Micronized flavonoid therapy in internal hemorrhoids of pregnancy. Int J Gynaecol Obstet 1997;57(2):145-151.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

© 2026 Therapeutic Research Center

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 20 references that drive our Diosmin monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Misra MC, Parshad R. Randomized clinical trial of micronized flavonoids in the early control of bleeding from acute internal haemorrhoids. Br J Surgery 2000;87:868-72. PubMed
  2. Thanapongsathorn W, Vajrabukka T. Clinical trial of oral diosmin (Daflon) in the treatment of hemorrhoids. Dis Colon Rectum 1992;35:1085-8. PubMed
  3. Cospite M. Double-blind, placebo-controlled evaluation of clinical activity and safety of Daflon 500 mg in the treatment of acute hemorrhoids. Angiology 1994;45:566-73.
  4. Guilhou JJ, Dereure O, Marzin L, et al. Efficacy of Daflon 500 mg in venous leg ulcer healing: a double-blind, randomized, controlled versus placebo trial in 107 patients. Angiology 1997;48:77-85.. PubMed
  5. Cospite, M. and Dominici, A. Double blind study of the pharmacodynamic and clinical activities of 5682 SE in venous insufficiency. Advantages of the new micronized form. Int Angiol. 1989;8(4 Suppl):61-65.
  6. Buckshee, K., Takkar, D., and Aggarwal, N. Micronized flavonoid therapy in internal hemorrhoids of pregnancy. Int J Gynaecol Obstet 1997;57(2):145-151. PubMed
  7. Kumar RM, Van Gompel JJ, Bower R, Rabinstein AA. Spontaneous intraventricular hemorrhage associated with prolonged diosmin therapy. Neurocrit Care. 2011 Jun;14(3):438-40. PubMed
  8. Milano G, Leone S, Fucile C, Zuccoli ML, Stimamiglio A, Martelli A, Mattioli F. Uncommon serum creatine phosphokinase and lactic dehydrogenase increase during diosmin therapy: two case reports. J Med Case Rep. 2014 Jun 16;8:194. PubMed
  9. Rajnarayana K, Venkatesham A, Krishna DR. Bioavailability of diclofenac sodium after pretreatment with diosmin in healthy volunteers. Drug Metabol Drug Interact. 2007;22(2-3):165-74. PubMed
  10. Rajnarayana K, Venkatesham A, Nagulu M, Srinivas M, Krishna DR. Influence of diosmin pretreatment on the pharmacokinetics of chlorzoxazone in healthy male volunteers. Drug Metabol Drug Interact. 2008;23(3-4):311-21. PubMed
  11. Yoo HH, Lee M, Chung HJ, Lee SK, Kim DH. Effects of diosmin, a flavonoid glycoside in citrus fruits, on P-glycoprotein-mediated drug efflux in human intestinal Caco-2 cells. J Agric Food Chem. 2007 Sep 5;55(18):7620-5. PubMed
  12. Bedada SK, Neerati P. Modulation of CYP3A enzyme activity by diosmin and its consequence on carbamazepine pharmacokinetics in rats. Naunyn Schmiedebergs Arch Pharmacol. 2018;391(2):115-21. PubMed
  13. Burkina V, Zlabek V, Halsne R, Ropstad E, Zamaratskaia G. In vitro effects of the citrus flavonoids diosmin, naringenin and naringin on the hepatic drug-metabolizing CYP3A enzyme in human, pig, mouse and fish. Biochem Pharmacol. 2016;110-111:109-16 PubMed
  14. Bedada SK, Boga PK. Influence of diosmin on the metabolism and disposition of carbamazepine in healthy subjects. Xenobiotica. 2017;47(10):879-84. PubMed
  15. Bedada SK, Boga PK, Kotakonda HK. The effect of diosmin on the pharmacokinetics of fexofenadine in healthy human volunteers. Xenobiotica. 2017;47(3):230-35. PubMed
Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Brand directory

Brands that make products with Diosmin

60 brands in our database make a supplement containing Diosmin.

Product directory

Supplement products with Diosmin

121 products in our database contain Diosmin. Open any to see its full ingredient list and every drug interaction we check.

Varicosil by Approved Science Capsule 45 Capsule(s) View ingredients & interactions Varicosil by Approved Science Capsule 45 Capsule(s) View ingredients & interactions Vasoflex D1 by Kramer Novis Other (e.g. Tea Bag) 90 Caplet(s) View ingredients & interactions Vasoflex HD by Kramer Novis Other (e.g. Tea Bag) 90 Caplet(s) View ingredients & interactions Vein Support by Doctor's Best Capsule 60 Veggie Cap(s) View ingredients & interactions Vein Support by Zoi Research Capsule 90 Vegetarian Capsule(s) View ingredients & interactions Vein Support by Zoi Research Capsule 250 Vegetarian Capsule(s) View ingredients & interactions VeinEase by AOR Advanced Orthomolecular Research Premium Capsule 60 Vegetarian Capsule(s) View ingredients & interactions VeinFactors by Futurebiotics Capsule 90 Vegetarian Capsule(s) View ingredients & interactions VeinoMax by SuperSmart Capsule 180 Vegetarian Capsule(s) View ingredients & interactions VeinRid Premium by Premium Certified Capsule 45 Veggie Capsule(s) View ingredients & interactions VeinSense by Natural Factors WS WomenSense Capsule 60 Vegetarian Capsule(s) View ingredients & interactions Venaliv by Kramer Novis Tablet Or Pill 90 Tablet(s) View ingredients & interactions VenaMend by Premier Research Labs Capsule 90 Plant-Source Capsule(s) View ingredients & interactions Venous Support by Karuna Capsule 90 Vegetarian Capsule(s) View ingredients & interactions Venous Support by Progressive Professional from Progressive Laboratories Capsule 90 Vegetable Capsule(s) View ingredients & interactions Venous Support by Karuna Capsule 90 Vegetarian Capsule(s) View ingredients & interactions Venous Support by Amvilab Tablet Or Pill 60 Tablet(s) View ingredients & interactions Venous Support by Karuna Capsule 90 Vegetarian Capsule(s) View ingredients & interactions VesselMax by Ortho Molecular Products Capsule 90 Capsule(s) View ingredients & interactions Youthful Legs by Life Extension Softgel Capsule 60 Softgel(s) View ingredients & interactions Youthful Legs by Life Extension Softgel Capsule 60 Softgel(s) View ingredients & interactions Beautiful Legs by Reserveage Nutrition Capsule 30 Veggie Capsule(s) Off market View ingredients & interactions Best Vein Support by Doctor's Best Capsule 60 Veggie Cap(s) Off market View ingredients & interactions
Pharmacist Counseling Corner

Diosmin: Common Questions

What is Diosmin used for, and does it work?
People use Diosmin for many reasons, but the evidence varies by use. According to the Natural Medicines database, there is at least some clinical evidence supporting Diosmin for Chronic venous insufficiency (CVI), Hemorrhoids and Venous leg ulcers. For most other uses it has been studied for, the evidence is currently insufficient to rate. See the graded list on this page, and always confirm with your pharmacist or doctor.
Does Diosmin interact with prescription medications?
Yes. We list 884 medications with a known interaction with Diosmin. Use the checker above to see how Diosmin interacts with a specific drug.
How are Diosmin interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Diosmin with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Diosmin interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Diosmin used for?
It is most commonly used for vein-related problems such as chronic venous insufficiency, varicose veins, leg swelling, and hemorrhoids.
Is Diosmin the same as hesperidin?
No, but they are related citrus flavonoids and are often combined in the same supplement, since Diosmin is frequently made from hesperidin.
Is Diosmin safe to take?
It is generally well tolerated for short-term use in many people, but long-term safety is less clear, so it is best to check with your pharmacist or doctor first.
Can I take Diosmin while pregnant or breastfeeding?
There is not enough reliable safety information, so it should be avoided unless your doctor specifically recommends it.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Products that contain Diosmin

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