Drug & supplement interaction

Basil + Quadrivalent Human Papillomavirus Vaccine

Quadrivalent Human Papillomavirus Vaccine brand name: Gardasil.

No Known Interaction

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

The bottom line No known interaction

We found no known interaction between Basil and Quadrivalent Human Papillomavirus Vaccine 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

Basil and Quadrivalent Human Papillomavirus Vaccine

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 Quadrivalent Human Papillomavirus Vaccine and Basil 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.

Basil safety at a glance

Basil overall Generally safe Basil is generally safe when eaten as a food, but concentrated extracts and essential oils are less studied.

Pregnancy Likely Safe When the above ground parts are used in amounts commonly found in foods. Read the full pregnancy detail

Breastfeeding Likely Safe When the above ground parts are used in amounts commonly 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 Quadrivalent Human Papillomavirus Vaccine and Basil? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

Keep it in perspective

Basil Does Interact With Other Medications

Basil has 289 moderate known drug interactions in our database — Quadrivalent Human Papillomavirus Vaccine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 289 No known interaction 2,541 (incl. Quadrivalent Human Papillomavirus Vaccine)

Taking anything else?

Check Another of Your Medications Against Basil

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

What to actually watch for

What Basil Itself Has Been Linked To

This is not an interaction — nothing below involves Quadrivalent Human Papillomavirus Vaccine. It is the side-effect record for Basil on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Basil, this list is the first place to look.

A skin rash Additional detail
“Allergic contact dermatitis has been reported in a 45-year old woman with occupational exposure to basil.”

Basil · Natural Medicines adverse-effect record, reported in dermatitis.
1 source cited

95140. Kiec-Swierczynska M, Krecisz B, Chomiczewska D, et al. Occupational allergic contact dermatitis caused by basil (Ocimum basilicum). Contact Dermatitis 2010;63(6):365-7.

Everything above comes from the Natural Medicines adverse-effect record for Basil — expand a row for the licensed statement it rests on. We haven’t matched Quadrivalent Human Papillomavirus Vaccine 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 Quadrivalent Human Papillomavirus Vaccine.

Special populations

Basil in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When the above ground parts are used in amounts commonly found in foods.

Pregnancy And Lactation Possibly Unsafe

When used in larger amounts due to the estragole constituent of the essential oil. Estragole might have mutagenic effects.

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

From our Q&A

Questions About Basil or Quadrivalent Human Papillomavirus Vaccine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Basil or Quadrivalent Human Papillomavirus Vaccine, 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.

One more smart check

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

We hold 396 real supplement products containing Basil, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Basil. Even though Basil itself has no known interaction with Quadrivalent Human Papillomavirus Vaccine, 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 Basil and Quadrivalent Human Papillomavirus Vaccine 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 Basil

Top 25%

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

29 days ago today

Medication Quadrivalent Human Papillomavirus Vaccine

Steady interest

#2,120 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 Basil reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Basil and Quadrivalent Human Papillomavirus Vaccine 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 Dr. Brian Staiger, PharmD, BCPS.

Supplement

About Basil

What is Basil?

Digestive upset and gas
Stress and anxiety
Antimicrobial support
Cold and cough symptoms
Headache
General antioxidant support

Basil is a popular cooking herb that is generally safe in the amounts used in food. While it has a long history of traditional medicinal use and contains antioxidant compounds, strong human evidence for most health claims is limited. Talk with your pharmacist or doctor before using concentrated supplements or essential oils.

Ocimum basilicum · Lamiaceae · Leaves, flowering tops, seeds, and essential oil · Fresh or dried leaves, culinary herb, tea, capsules, extracts, and essential oil

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

Basil: dosing

There is no well-established standard medicinal dose for basil. As a food and seasoning, it is used freely to taste with no special precautions for most people.For supplements, teas, or extracts, the right amount is not clearly defined by research. Follow the directions on the product label and do not exceed them.

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

Read the full Basil monograph & all interactions

Keep checking

Other Drugs & Basil

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

0Major

289Moderate

0Minor

2,540No known interaction

289 Moderate 2,540 No interaction

Moderate

289 interactions

Showing 60 of 289 moderate interactions — see all 289 on the Basil page.

No interaction 2,540 drugs checked — show the list

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

Showing the 60 most looked-up of 2,540 medications checked with no known interaction — see the full Basil list.

See the full Basil interactions page

See every supplement checked against Quadrivalent Human Papillomavirus Vaccine, ranked by severity

Evidence & sources

Basil References

The 7 references that drive our Basil 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.

Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
Tognolini, M., Barocelli, E., Ballabeni, V., Bruni, R., Bianchi, A., Chiavarini, M., and Impicciatore, M. Comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. Life Sci. 2-23-2006;78(13):1419-1432. PubMed
Tohti, I., Tursun, M., Umar, A., Turdi, S., Imin, H., and Moore, N. Aqueous extracts of Ocimum basilicum L. (sweet basil) decrease platelet aggregation induced by ADP and thrombin in vitro and rats arterio--venous shunt thrombosis in vivo. Thromb.Res 200 PubMed
Amrani, S., Harnafi, H., Gadi, D., Mekhfi, H., Legssyer, A., Aziz, M., Martin-Nizard, F., and Bosca, L. Vasorelaxant and anti-platelet aggregation effects of aqueous Ocimum basilicum extract. J Ethnopharmacol. 8-17-2009;125(1):157-162. PubMed
Umar, A., Imam, G., Yimin, W., Kerim, P., Tohti, I., Berke, B., and Moore, N. Antihypertensive effects of Ocimum basilicum L. (OBL) on blood pressure in renovascular hypertensive rats. Hypertens.Res 5-7-2010; PubMed
Kiec-Swierczynska M, Krecisz B, Chomiczewska D, et al. Occupational allergic contact dermatitis caused by basil (Ocimum basilicum). Contact Dermatitis 2010;63(6):365-7.

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 Basil and Quadrivalent Human Papillomavirus Vaccine Together: Common Questions

Is it safe to take Basil with Quadrivalent Human Papillomavirus Vaccine?

We do not list a known interaction between Basil and Quadrivalent Human Papillomavirus Vaccine. 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 Basil interact with any other medications?

Yes. Basil has 289 documented drug interactions in our database — Quadrivalent Human Papillomavirus Vaccine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.

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

Where next

Keep Exploring

Basil monograph Uses, safety profile, and every drug interaction in one place Quadrivalent Human Papillomavirus Vaccine supplement interactions Every supplement checked against Quadrivalent Human Papillomavirus Vaccine, 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 7 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Quadrivalent Human Papillomavirus Vaccine and Basil?

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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.