Perillyl Alcohol + Letrozole
Letrozole brand name: Femara.
We found no known interaction between Perillyl Alcohol and Letrozole 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 two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.
Perillyl Alcohol and Letrozole
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 Letrozole and Perillyl Alcohol 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 Perillyl Alcohol at all — not against Letrozole, 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.
Perillyl Alcohol safety at a glance
Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
What Letrozole Is Prescribed For, and What Perillyl Alcohol Has Been Studied For
These two come up together because they touch the same health topic — not because they do the same job. Letrozole is a prescription medicine with approved uses on its FDA label. Perillyl Alcohol is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.
Letrozole is prescribed for: Letrozole (brand name Femara) is used to treat breast cancer in postmenopausal women whose tumors are driven by estrogen. It is used in three settings: as adjuvant (after-surgery) treatment for hormone receptor positive early breast cancer; as extended adjuvant treatment for women who have already completed about five years of tamoxifen therapy; and as first- or second-line treatment for locally advanced or metastatic (spread) breast cancer. Femara is specifically indicated for first-line treatment of hormone receptor positive or receptor-unknown locally advanced or metastatic breast cancer, and for advanced breast cancer in women whose disease has progressed after antiestrogen therapy.
Perillyl Alcohol has been studied for:
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Breast cancer studied, not established Perillyl Alcohol has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows
Perillyl Alcohol for breast cancer
Preliminary clinical research shows that taking perillyl alcohol 1200-1500 mg/m2 orally four times daily does not improve survival in women with advanced treatment-refractory breast cancer. Adverse effects limited the planned duration of the study.
1 source cited
- 98639. Bailey HH, Attia S, Love RR, et al. Phase II trial of daily oral perillyl alcohol (NSC 641066) in treatment-refractory metastatic breast cancer. Cancer Chemother Pharmacol. 2008;62(1):149-57. PubMed
Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Letrozole on your own; if you are taking Perillyl Alcohol for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.
Questions About Perillyl Alcohol or Letrozole
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Perillyl Alcohol or Letrozole, 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.
See Every Supplement That Interacts With Letrozole
This page covers Perillyl Alcohol only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Letrozole page lists 142 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), 7-methoxyflavone (moderate) and Acacia Rigidula (moderate).
By severity: 3 major · 99 moderate · 40 minor.
From our pharmacist’s overview on the Letrozole page
“Letrozole (Femara) is prescribed to keep hormone-driven breast cancer from returning, so a supplement that shifts its blood level can quietly undercut treatment. Give this list of 142 ingredients genuine respect, and learn the three major entries first.”
Reviewed by 2 · Jul 18, 2026
Where Perillyl Alcohol and Letrozole 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.
#1,373 of 1,452 supplements looked up here in the last 7 days
#50 of 2,830 medications looked up here in the last 7 days
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 Perillyl Alcohol reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Perillyl Alcohol and Letrozole 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.
About Perillyl Alcohol
What is Perillyl Alcohol?
- Cancer research (investigational)
- Antioxidant interest
- General wellness supplement
- Aromatherapy-related products
Perillyl alcohol is a natural compound found in the essential oils of plants like mint, lavender, and citrus, and it has mainly been studied as an experimental anti-cancer agent rather than as an everyday supplement. The evidence in people is limited and still under investigation, so it should not be used to treat or prevent any disease without medical supervision. Talk to your pharmacist or doctor before trying it.
Naturally found in the essential oils of plants such as lavender, peppermint, sage, cherries, and citrus fruits; often produced from limonene · Capsules, oral liquid, and (in research settings) intranasal preparations
An interaction check asks whether these two react with each other — it does not ask whether Perillyl Alcohol is a good idea for someone in your situation. Here is what our Perillyl Alcohol record says about it on its own.
Perillyl Alcohol: dosing
There is no established standard supplement dose of perillyl alcohol for the general public. The doses used in research were chosen for clinical trials and were given under close medical supervision, so they do not apply to over-the-counter use.If you choose to use a product that contains perillyl alcohol, follow the directions on the product label and do not exceed them.
From our Perillyl Alcohol monograph — the full record covers uses, side effects and every documented interaction.
About Letrozole
What Is Letrozole Used For?
Brand name: Femara
Letrozole (brand name Femara) is used to treat breast cancer in postmenopausal women whose tumors are driven by estrogen. It is used in three settings: as adjuvant (after-surgery) treatment for hormone receptor positive early breast cancer; as extended adjuvant treatment for women who have already completed about five years of tamoxifen therapy; and as first- or second-line treatment for locally advanced or metastatic (spread) breast cancer.
Femara is specifically indicated for first-line treatment of hormone receptor positive or receptor-unknown locally advanced or metastatic breast cancer, and for advanced breast cancer in women whose disease has progressed after antiestrogen therapy.
Other Drugs & Perillyl Alcohol
Browse every other medication we’ve checked against Perillyl Alcohol — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Perillyl Alcohol against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Testosterone ›
- Losartan Potassium ›
- Metoprolol ›
- Aspirin ›
- Ivermectin ›
- Rivaroxaban ›
- Rosuvastatin ›
- Escitalopram ›
- Tadalafil ›
- Acetaminophen ›
- Clopidogrel ›
- Valacyclovir ›
- Atorvastatin ›
- Docusate ›
- Hydroxyurea ›
- Abemaciclib ›
- Methamphetamine ›
- Sumatriptan ›
- Ibuprofen ›
- Semaglutide ›
- Tirzepatide ›
- Warfarin Sodium ›
- Prednisone ›
- Propranolol ›
- Lisdexamfetamine ›
- Acyclovir ›
- Bupropion ›
- Metformin ›
- Amoxicillin ›
- Lisinopril ›
- Bendamustine ›
- Amitriptyline ›
- Doxycycline ›
- Lamotrigine ›
- Fluoxetine ›
- Methotrexate ›
- Acetaminophen, Codeine ›
- Gabapentin ›
- Amphetamine ›
- Pregabalin ›
- Isotretinoin ›
- Dextroamphetamine ›
- Azithromycin ›
- Clonazepam ›
- Quetiapine ›
- Omeprazole ›
- Amlodipine Besylate ›
- Methylene Blue ›
- Duloxetine ›
- Buspirone ›
- Citalopram ›
- Ciprofloxacin ›
- Naproxen ›
- Bisoprolol ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Perillyl Alcohol list.
Perillyl Alcohol References
The 18 references that drive our Perillyl Alcohol 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.
- Bailey HH, Wilding G, Tutsch KD, et al. A phase I trial of perillyl alcohol administered four times daily for 14 days out of 28 days. Cancer Chemother Pharmacol 2004;54:368-76. PubMed
- Stearns V, Coop A, Singh B, et al. A pilot surrogate end point biomarker trial of perillyl alcohol in breast neoplasia. Clin Cancer Res 2004;10:7583-91. PubMed
- Morgan-Meadows S, Dubey S, Gould M, et al. Phase I trial of perillyl alcohol administered four times daily continuously. Cancer Chemother Pharmacol 2003;52:361-6. PubMed
- Liu G, Oettel K, Bailey H, et al. Phase II trial of perillyl alcohol (NSC 641066) administered daily in patients with metastatic androgen independent prostate cancer. Invest New Drugs 2003;21:367-72. PubMed
- Granath J, Ingvarsson S, von Thiele U, Lundberg U. Stress management: a randomized study of cognitive behavioural therapy and yoga. Cogn Behav Ther 2006;35:3-10. PubMed
- Ripple, G. H., Gould, M. N., Arzoomanian, R. Z., Alberti, D., Feierabend, C., Simon, K., Binger, K., Tutsch, K. D., Pomplun, M., Wahamaki, A., Marnocha, R., Wilding, G., and Bailey, H. H. Phase I clinical and pharmacokinetic study of perillyl alcohol adm
- Ripple GH, Gould MN, Stewart JA, and et al. Phase I clinical trial of perillyl alcohol administered daily. Clin Cancer Res 1998;4(5):1159-1164.
- Hudes, G. R., Szarka, C. E., Adams, A., Ranganathan, S., McCauley, R. A., Weiner, L. M., Langer, C. J., Litwin, S., Yeslow, G., Halberr, T., Qian, M., and Gallo, J. M. Phase I pharmacokinetic trial of perillyl alcohol (NSC 641066) in patients with refract
- Bailey, H. H., Levy, D., Harris, L. S., Schink, J. C., Foss, F., Beatty, P., and Wadler, S. A phase II trial of daily perillyl alcohol in patients with advanced ovarian cancer: Eastern Cooperative Oncology Group Study E2E96. Gynecol.Oncol. 2002;85(3):464- PubMed
- Murren, J. R., Pizzorno, G., DiStasio, S. A., McKeon, A., Peccerillo, K., Gollerkari, A., McMurray, W., Burtness, B. A., Rutherford, T., Li, X., Ho, P. T., and Sartorelli, A. Phase I study of perillyl alcohol in patients with refractory malignancies. Canc PubMed
- Azzoli, C. G., Miller, V. A., Ng, K. K., Krug, L. M., Spriggs, D. R., Tong, W. P., Riedel, E. R., and Kris, M. G. A phase I trial of perillyl alcohol in patients with advanced solid tumors. Cancer Chemother.Pharmacol. 2003;51(6):493-498. PubMed
- Meadows, S. M., Mulkerin, D., Berlin, J., Bailey, H., Kolesar, J., Warren, D., and Thomas, J. P. Phase II trial of perillyl alcohol in patients with metastatic colorectal cancer. Int J Gastrointest.Cancer 2002;32(2-3):125-128. PubMed
- Stratton SP, Alberts DS, Einspahr JG, et al. A phase 2a study of topical perillyl alcohol cream for chemoprevention of skin cancer. Cancer Prev Res (Phila). 2010;3(2):160-9. PubMed
- da Fonseca CO, Linden R, Futuro D, Gattass CR, Quirico-Santos T. Ras pathway activation in gliomas: a strategic target for intranasal administration of perillyl alcohol. Arch Immunol Ther Exp (Warsz). 2008;56(4):267-76. PubMed
- Stratton SP, Saboda KL, Myrdal PB, et al. Phase 1 study of topical perillyl alcohol cream for chemoprevention of skin cancer. Nutr Cancer. 2008;60(3):325-30. PubMed
- Matos JM, Schmidt CM, Thomas HJ, et al. A pilot study of perillyl alcohol in pancreatic cancer. J Surg Res. 2008;147(2):194-9. PubMed
- Bailey HH, Attia S, Love RR, et al. Phase II trial of daily oral perillyl alcohol (NSC 641066) in treatment-refractory metastatic breast cancer. Cancer Chemother Pharmacol. 2008;62(1):149-57. PubMed
- Schönthal AH, Peereboom DM, Wagle N, et al. Phase I trial of intranasal NEO100, highly purified perillyl alcohol, in adult patients with recurrent glioblastoma. Neurooncol Adv 2021;3(1):vdab005. 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.
Taking Perillyl Alcohol and Letrozole Together: Common Questions
Is it safe to take Perillyl Alcohol with Letrozole?
Do Perillyl Alcohol and Letrozole have any of the same side effects?
Are Perillyl Alcohol and Letrozole used for the same thing?
Does Letrozole interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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