Drug & supplement interaction

Diosmin + Castor Oil (OTC drug)

Castor Oil (OTC drug) brand name: Purge.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Diosmin and Castor Oil (OTC drug) in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Castor Oil (OTC drug) states a food rule worth keeping to.

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Interaction report

Diosmin and Castor Oil (OTC drug)

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Castor Oil (OTC drug) and Diosmin in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Diosmin safety at a glance

Diosmin overall Use caution Generally well tolerated short-term, but long-term safety is less well studied.
Pregnancy Likely Safe When used orally in amounts found in foods. Read the full pregnancy detail
Breastfeeding Likely Safe When used orally in amounts found in foods. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Castor Oil (OTC drug) and Diosmin? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Castor Oil (OTC drug)

Interactions in our licensed database are recorded against drug classes, not just single drug names. Castor Oil (OTC drug) is filed under 2 classifications — stimulant laxatives, oral drugs. Diosmin has documented interactions with 9 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), carbamazepine (tegretol) (moderate) and chlorzoxazone (parafon forte, paraflex) (moderate) — and none of Castor Oil (OTC drug)’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Diosmin Does Interact With Other Medications

Diosmin has 884 moderate known drug interactions in our database — Castor Oil (OTC drug) isn’t one of them. If you take anything else, check it against the full list below.

Moderate 884 No known interaction 1,946 (incl. Castor Oil (OTC drug))
Taking anything else?

Check Another of Your Medications Against Diosmin

Covers the 2,830 medications we’ve checked against Diosmin. Pick one to open its full report.

What to actually watch for

What Diosmin Itself Has Been Linked To

This is not an interaction — nothing below involves Castor Oil (OTC drug). It is the side-effect record for Diosmin on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Diosmin, this list is the first place to look. 3 entries are worth acting on rather than waiting out — marked below.

  • An irregular heartbeat Worth acting on Additional detail

    “Orally, diosmin can cause cardiac arrhythmias.”

    Diosmin · Natural Medicines adverse-effect record, reported in arrhythmia.

    2 sources cited
    1. 93887. 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
    2. 105293. 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. PubMed
  • Anemia Worth acting on Additional detail

    “Orally, diosmin can cause hemolytic anemia.”

    Diosmin · Natural Medicines adverse-effect record, reported in anemia.

    1 source cited
    1. 93887. 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
  • Hives Worth acting on Additional detail

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

    Diosmin · Natural Medicines adverse-effect record, reported in urticaria.

    1 source cited
    1. 93887. 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
  • Bloating or gas Additional detail

    “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).”

    Diosmin · Natural Medicines adverse-effect record, reported in diarrhea.

    6 sources cited
    1. 4861. 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. 4898. Thanapongsathorn W, Vajrabukka T. Clinical trial of oral diosmin (Daflon) in the treatment of hemorrhoids. Dis Colon Rectum 1992;35:1085-8. PubMed
    3. 4900. 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. 10229. 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. 54935. 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. 54970. 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
  • Muscle pain Additional detail

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

    Diosmin · Natural Medicines adverse-effect record, reported in pain.

    1 source cited
    1. 93887. 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
  • Stomach upset / Stomach pain Additional detail

    Recorded for Diosmin in the same Natural Medicines adverse-effect record shown under An irregular heartbeat above.

  • Itching Additional detail

    Recorded for Diosmin in the same Natural Medicines adverse-effect record shown under Hives above.

  • Tiredness Additional detail

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

    Diosmin · Natural Medicines adverse-effect record, reported in cluster headache.

    6 sources cited
    1. 4861. 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. 4898. Thanapongsathorn W, Vajrabukka T. Clinical trial of oral diosmin (Daflon) in the treatment of hemorrhoids. Dis Colon Rectum 1992;35:1085-8. PubMed
    3. 4900. 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. 10229. 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. 93887. 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
    6. 105293. 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. PubMed
  • Dizziness Additional detail

    Recorded for Diosmin in the same Natural Medicines adverse-effect record shown under An irregular heartbeat above.

Showing the 10 most notable of 13 recorded effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

Everything above comes from the Natural Medicines adverse-effect record for Diosmin — expand a row for the licensed statement it rests on. We haven’t matched Castor Oil (OTC drug) to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Castor Oil (OTC drug).

Special populations

Diosmin in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally in amounts found in foods.

Pregnancy And Lactation 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.

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

How to take them

Some Castor Oil (OTC drug) Products Have a Food Rule — Diosmin Should Not Break It

At least one FDA label for a product containing Castor Oil (OTC drug) says to take it on an empty stomach. Most supplements — Diosmin included — are taken with a meal, so the easy mistake is swallowing both together at breakfast. Where that rule applies, keep Castor Oil (OTC drug) on its own and move Diosmin to a meal later in the day.

This may not be true of your version. Food instructions belong to the product, not the ingredient: two Castor Oil (OTC drug) products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.

Directions Preferably taken on an empty stomach.

From the Dosage and Administration section of the FDA label we read for Castor Oil (OTC drug) — where that label names a specific product, the instruction is that product's.

A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.

Everything else you take

See Every Supplement That Interacts With Castor Oil (OTC drug)

This page covers Diosmin only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Castor Oil (OTC drug) page lists 46 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Jalap (major), Oleander (major), Alder Buckthorn (moderate) and Aloe (moderate).

By severity: 3 major · 34 moderate · 9 minor.

From our pharmacist’s overview on the Castor Oil (OTC drug) page

“Castor oil, the classic over-the-counter purgative, deserves real care around supplements. Most of what's flagged against it are herbal laxatives in their own right, and doubling up can drain enough fluid and potassium to cause genuine harm, in some cases making plants that contain heart-active compounds, oleander chief among them, far…”

Reviewed by 2 · Jul 18, 2026

Open the Castor Oil (OTC drug) interaction page

One more smart check

Taking Diosmin as Part of a Dietary Supplement Product? Check It for Interactions

We hold 121 real supplement products containing Diosmin, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Diosmin. Even though Diosmin itself has no known interaction with Castor Oil (OTC drug), another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Diosmin and Castor Oil (OTC drug) Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Diosmin
Top half

#387 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Castor Oil (OTC drug)
Top 25%

#570 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Diosmin reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Diosmin and Castor Oil (OTC drug) records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Diosmin

What is Diosmin?

  • Chronic venous insufficiency
  • Hemorrhoids
  • Leg swelling and heaviness
  • Varicose veins
  • Spider veins

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.

A flavonoid derived from citrus fruit peels (often made from hesperidin) · Tablets, capsules (often combined with hesperidin)

An interaction check asks whether these two react with each other — it does not ask whether Diosmin is a good idea for someone in your situation. Here is what our Diosmin record says about it on its own.

Diosmin: dosing

There is no single official dose of diosmin for supplement use. Do not assume that taking more will work better or be safer.

From our Diosmin monograph — the full record covers uses, side effects and every documented interaction.

Read the full Diosmin monograph & all interactions
Keep checking

Other Drugs & Diosmin

Browse every other medication we’ve checked against Diosmin — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
884Moderate
0Minor
1,945No known interaction
884 Moderate 1,945 No interaction
Moderate

884 interactions

Showing 60 of 884 moderate interactions — see all 884 on the Diosmin page.

No interaction 1,945 drugs checked — show the list

We also checked Diosmin against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 1,945 medications checked with no known interaction — see the full Diosmin list.

See the full Diosmin interactions page
See every supplement checked against Castor Oil (OTC drug), ranked by severity
Evidence & sources

Diosmin References

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

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Diosmin and Castor Oil (OTC drug) Together: Common Questions

Is it safe to take Diosmin with Castor Oil (OTC drug)?
We do not list a known interaction between Diosmin and Castor Oil (OTC drug). That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Should I take Diosmin and Castor Oil (OTC drug) at the same time of day?
At least one FDA label for a product containing Castor Oil (OTC drug) says to take it on an empty stomach, and supplements are usually taken with a meal — so taking them together at breakfast is the easy mistake. Where that applies, keep Castor Oil (OTC drug) on its own and move Diosmin to a meal later in the day. Food instructions belong to the product rather than the ingredient, so check the directions on your own box. This is about absorption, not an interaction.
How was the Diosmin and Castor Oil (OTC drug) combination checked?
Interactions in our licensed database are recorded against drug classes. Castor Oil (OTC drug) is filed under 2 classifications, and Diosmin has documented interactions with 9 drug classes — none of Castor Oil (OTC drug)'s classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Diosmin interact with any other medications?
Yes. Diosmin has 884 documented drug interactions in our database — Castor Oil (OTC drug) is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Castor Oil (OTC drug) interact with any supplements?
Yes. Castor Oil (OTC drug) has documented interactions with 46 supplements in our database — Diosmin is not one of them. The Castor Oil (OTC drug) interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Diosmin monograph Uses, safety profile, and every drug interaction in one place Castor Oil (OTC drug) supplement interactions Every supplement checked against Castor Oil (OTC drug), ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 20 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Castor Oil (OTC drug) and Diosmin?

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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.