Drug & supplement interaction

Sweet Violet + Tadalafil

Tadalafil brand names: Cialis, Tadliq.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated June 2026 · Pair last verified Sep 13, 2026

The bottom line No known interaction

We found no known interaction between Sweet Violet and Tadalafil 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.

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Interaction report

Sweet Violet and Tadalafil

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 Tadalafil and Sweet Violet 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Sweet Violet at all — not against Tadalafil, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Sweet Violet safety at a glance

Sweet Violet overall Use caution Generally regarded as gentle in small culinary or tea amounts, but human safety data are limited.

Pregnancy Avoid Not enough safety information is available, so it is best avoided during pregnancy.

Breastfeeding Avoid There is not enough information to know if it is safe while breastfeeding, so avoid it.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Tadalafil and Sweet Violet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

What to actually watch for

What Tadalafil’s Own FDA Label Lists

This is not an interaction — none of it involves Sweet Violet. These are the most notable effects listed in the ADVERSE REACTIONS section of Tadalafil’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both.

Flushing
A stuffy or runny nose
Back pain
Muscle pain
Stomach upset
Headache mentioned in 11.1% of FDA reports for Tadalafil
Stomach pain

From the ADVERSE REACTIONS section of the FDA label for Tadalafil. Read the label on DailyMed › Where a percentage is shown, it is the share of 98,103 voluntary FDA FAERS reports for Tadalafil that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Sweet Violet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Sweet Violet side to compare — that is a limit of the record, not a statement that Sweet Violet has no side effects.

From our Q&A

Questions About Sweet Violet or Tadalafil

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Sweet Violet or Tadalafil, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Tadalafil

This page covers Sweet Violet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Tadalafil page lists 144 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Mistletoe (major), Grapefruit (major), Hawthorn (major) and St. John's Wort (major).

By severity: 5 major · 98 moderate · 41 minor.

From our pharmacist’s overview on the Tadalafil page

“Grapefruit juice is the first thing to know about if you take tadalafil (Cialis, Tadliq). It blocks CYP3A4, the enzyme that clears the drug, so blood levels climb and side effects like a steep drop in blood pressure become more likely.”

Reviewed by 2 · Jul 18, 2026

Open the Tadalafil interaction page

One more smart check

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

We hold 14 real supplement products containing Sweet Violet, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Sweet Violet. Even though Sweet Violet itself has no known interaction with Tadalafil, 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 Sweet Violet and Tadalafil 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 Sweet Violet

Steady interest

#1,415 of 1,452 supplements looked up here in the last 7 days

29 days ago today

Medication Tadalafil

Top 1%

#16 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 Sweet Violet reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Sweet Violet and Tadalafil records this page draws on were last updated June 22, 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 Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Sweet Violet

What is Sweet Violet?

Cough and sore throat
Bronchitis and chest congestion
Trouble sleeping
Skin irritation
Mild constipation
Headache

Sweet Violet is a traditional herb used mainly as a soothing remedy for coughs, sore throats, and minor respiratory complaints. Modern scientific evidence supporting these uses is very limited, so it should not replace proven treatments. It is generally considered gentle in food-like amounts, but talk with your pharmacist or doctor before using it, especially if you are pregnant, breastfeeding, or giving it to a child.

Viola odorata · Violaceae · Flowers, leaves, and roots; sometimes the whole plant · Tea (infusion), syrup, dried herb, tincture, and topical preparations

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

Sweet Violet: dosing

There is no standardized or officially established dose for Sweet Violet. Traditional use most often involves a tea made from the dried flowers or leaves, or a syrup for cough, but exact amounts vary widely between products and recipes.The safest approach is to follow the directions on the product label and not exceed the recommended amount.

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

Read the full Sweet Violet monograph & all interactions

Medication

About Tadalafil

What Is Tadalafil Used For?

Brand names: Cialis, Tadliq

Tadalafil tablets (including Cialis and generic tadalafil) are used to treat erectile dysfunction (ED), the symptoms of benign prostatic hyperplasia (BPH — an enlarged prostate), or both conditions together. When used with the drug finasteride to start BPH treatment, this combination is recommended for up to 26 weeks.

Adcirca, Alyq (tablets), and Tadliq (oral suspension) are indicated specifically for pulmonary arterial hypertension (PAH — high blood pressure in the lungs), to improve the ability to exercise.

Most-Reported Side Effects for Tadalafil

From FAERS, the FDA’s public side-effect reporting system (99,210 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Dyspnea 11,917 reports

Headache 10,982 reports

Diarrhea 8,020 reports

Nausea 6,697 reports

Fatigue 6,080 reports

See full Tadalafil drug information

Keep checking

Other Drugs & Sweet Violet

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

0Major

0Moderate

0Minor

2,829No known interaction

2,829 No interaction

No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Sweet Violet list.

See the full Sweet Violet interactions page

See every supplement checked against Tadalafil, ranked by severity

Evidence & sources

Sweet Violet References

The 8 references that drive our Sweet Violet 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.

Beiraghdar F, Einollahi B, Ghadyani A, et al. A two-week, double-blind, placebo-controlled trial of Viola odorata, Echium amoenum and Physalis alkekengi mixture in symptomatic benign prostate hyperplasia (BPH) men. Pharm Biol 2017;55(1):1800-5.
Qasemzadeh MJ, Sharifi H, Hamedanian M, et al. The effect of Viola odorata flower syrup on the cough of children with asthma: a double-blind, randomized controlled trial. J Evid Based Complementary Altern Med 2015;20(4):287-91. doi: 10.1177/21565872155848 PubMed
Feyzabadi Z, Rezaeitalab F, Badiee S, et al. Efficacy of Violet oil, a traditional Iranian formula, in patients with chronic insomnia: A randomized, double-blind, placebo-controlled study. J Ethnopharmacol 2018;214:22-8. doi: 10.1016/j.jep.2017.11.036. PubMed
Shayesteh M, Vaez-Mahdavi MR, Shams J, et al. Effects of Viola odorata as an Add-On Therapy on Insomnia in Patients with Obsession or Depression: A Pilot Randomized Double-Blind Placebo-Controlled Trial. J Altern Complement Med 2020;26(5):398-408.
Taherzadeh Z, Khaluyan H, Iranshahy M, Rezaeitalab F, Eshaghi Ghalibaf MH, Javadi B. Evaluation of sedative effects of an intranasal dosage form containing saffron, lettuce seeds and sweet violet in primary chronic insomnia: A randomized, double-dummy, do
Tafazoli V, Shahriari M, Heydari M, Nikbakht HA, Zarshenaas MM, Nimrouzi M. The Effect of Viola Odorata L. Oil for Fever in Children: A Randomized Triple-blinded Placebo-controlled Clinical Trial. Curr Drug Discov Technol 2020;17(5):696-703. PubMed
Yazdi N, Kardooni M, Namjuyan F, Vardanjani HM, Tafazoli V, Jaladat AM. Efficacy of Sweet Violet (Viola odorata) flower oil on the symptoms of adults with allergic rhinitis: A double-blind randomized placebo-controlled clinical trial. Complement Ther Med PubMed
Saffar Shahroodi A, Nejabat M, Nimrouzi M, Aghaei H, Salehi A, Rezaei Mokarram A. Effects of intranasal administration of violet oil in dry eye disease. Clin Exp Optom 2019;102(6):576-582. 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 Sweet Violet and Tadalafil Together: Common Questions

Is it safe to take Sweet Violet with Tadalafil?

We do not list a known interaction between Sweet Violet and Tadalafil. 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.

Does Tadalafil interact with any supplements?

Yes. Tadalafil has documented interactions with 144 supplements in our database — Sweet Violet is not one of them. The Tadalafil 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

Sweet Violet monograph Uses, safety profile, and every drug interaction in one place Tadalafil drug information The full plain-English guide to this medication Tadalafil supplement interactions Every supplement checked against Tadalafil, 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 8 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Tadalafil and Sweet Violet?

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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.