Drug & supplement interaction

Cajeput Oil + Diphenhydramine

Diphenhydramine brand names: Benadryl, Dormin, Allerdryl, Valdrene, Sleep-Ettes D, and others.

No Known Interaction

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Updated June 2026 · Pair last verified Sep 20, 2026

The bottom line No known interaction

We found no known interaction between Cajeput Oil and Diphenhydramine 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

Cajeput Oil and Diphenhydramine

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 Diphenhydramine and Cajeput Oil 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.

Cajeput Oil safety at a glance

Cajeput Oil overall Use caution Generally used topically or for inhalation in diluted form; it can irritate skin and should not be swallowed.

Pregnancy Avoid Safety has not been established, so it is best avoided during pregnancy.

Breastfeeding Avoid Not enough safety information, so avoid use while breastfeeding.

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

Still wondering about combining Diphenhydramine and Cajeput Oil? Ask Dr. Brian Staiger, PharmD, BCPS directly ›

How we checked

Why No Interaction Is Listed for Diphenhydramine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Diphenhydramine is filed under 7 classifications — including cytochrome p450 2d6 (cyp2d6) inhibitors, anticholinergic drugs, topical drugs. Cajeput Oil has documented interactions with 2 drug classes — the most serious being antidiabetes drugs (moderate) and cytochrome p450 2d6 (cyp2d6) substrates (moderate) — and none of Diphenhydramine’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

Cajeput Oil Does Interact With Other Medications

Cajeput Oil has 278 moderate known drug interactions in our database — Diphenhydramine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 278 No known interaction 2,552 (incl. Diphenhydramine)

Taking anything else?

Check Another of Your Medications Against Cajeput Oil

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

What to actually watch for

What Diphenhydramine’s Own FDA Label Lists

This is not an interaction — none of it involves Cajeput Oil. These are the most notable effects listed in the ADVERSE REACTIONS section of Diphenhydramine’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. 10 of them are worth acting on rather than waiting out — marked below.

Trouble passing urine Worth acting on
Wheezing Worth acting on
An irregular heartbeat Worth acting on
Confusion Worth acting on
Seizures Worth acting on
A low platelet count Worth acting on
Anemia Worth acting on
A severe allergic reaction Worth acting on
Hives Worth acting on
A low white blood cell count Worth acting on

Showing the 10 most notable of 33 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Diphenhydramine. Read the label on DailyMed › Cajeput Oil’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Cajeput Oil side to compare — that is a limit of the record, not a statement that Cajeput Oil has no side effects.

From our Q&A

Questions About Cajeput Oil or Diphenhydramine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Cajeput Oil or Diphenhydramine, 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 Diphenhydramine

This page covers Cajeput Oil only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Diphenhydramine page lists 147 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: 1,4-butanediol (major), Activated Charcoal (major), Beer (major), Gamma-hydroxybutyrate (ghb) (major) and Henbane (major).

By severity: 9 major · 119 moderate · 19 minor.

From our pharmacist’s overview on the Diphenhydramine page

“Diphenhydramine (Benadryl, Simply Sleep) is sedating by design, and most of the 147 supplements and herbal ingredients on this list lean into that. Seventy-eight are sedating substances themselves, alcohol and kava the standouts, and stacking them can slow breathing and reflexes well beyond ordinary drowsiness.”

Reviewed by 2 · Jul 18, 2026

Open the Diphenhydramine interaction page

How much people look this up

Where Cajeput Oil and Diphenhydramine 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 Cajeput Oil

Top half

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

29 days ago today

Medication Diphenhydramine

Top 25%

#423 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 Cajeput Oil reference on this page ↓
Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Cajeput Oil and Diphenhydramine 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 Cajeput Oil

What is Cajeput Oil?

Muscle and joint aches
Cough and congestion
Minor skin irritation
Insect repellent
Aromatherapy

Cajeput oil is an aromatic essential oil traditionally used for aches, congestion, and minor skin complaints, but solid human evidence for these uses is limited. Like other essential oils, it should never be swallowed and should be diluted before applying to skin; consult a pharmacist or doctor before use, especially in children, pregnancy, or breastfeeding.

Melaleuca cajuputi · Myrtaceae · Essential oil distilled from the leaves and twigs · Essential oil, diluted topical rubs, inhalants/balms, aromatherapy blends

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

Cajeput Oil: dosing

There is no official, standardized dose for cajeput oil, and no proven safe amount for taking it internally. For topical or aromatherapy use, the general practice is to dilute a small amount of the essential oil in a carrier oil before applying to the skin.Because products differ in strength, follow the directions on the label and do not exceed them.

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

Read the full Cajeput Oil monograph & all interactions

Medication

About Diphenhydramine

What Is Diphenhydramine Used For?

Brand names: Benadryl, Dormin, Allerdryl, Valdrene, Sleep-Ettes D, Simply Sleep, Sominex, Diphenhydramine, Compoz, Sleep Aid, Benadryl cream, Benadryl spray, Dermamycin cream, Ziradryl, Nytol

Diphenhydramine temporarily relieves symptoms of hay fever, other upper respiratory allergies, and the common cold — including runny nose, sneezing, itchy or watery eyes, and itching of the nose or throat.

After Bite Xtra gel is formulated for topical use and is approved to temporarily relieve pain and itching from minor burns, minor cuts and scrapes, insect bites, minor skin irritations, and rashes from poison ivy, poison oak, and poison sumac.

See full Diphenhydramine drug information

Keep checking

Other Drugs & Cajeput Oil

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

0Major

278Moderate

0Minor

2,551No known interaction

278 Moderate 2,551 No interaction

Moderate

278 interactions

Showing 60 of 278 moderate interactions — see all 278 on the Cajeput Oil page.

No interaction 2,551 drugs checked — show the list

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

Showing the 60 most looked-up of 2,551 medications checked with no known interaction — see the full Cajeput Oil list.

See the full Cajeput Oil interactions page

See every supplement checked against Diphenhydramine, ranked by severity

Evidence & sources

Cajeput Oil References

The 2 references that drive our Cajeput Oil 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.

Moharram, F. A., Marzouk, M. S., El Toumy, S. A., Ahmed, A. A., and Aboutabl, E. A. Polyphenols of Melaleuca quinquenervia leaves--pharmacological studies of grandinin. Phytother Res 2003;17(7):767-773.
Subehan, Usia, T., Iwata, H., Kadota, S., and Tezuka, Y. Mechanism-based inhibition of CYP3A4 and CYP2D6 by Indonesian medicinal plants. J Ethnopharmacol. 5-24-2006;105(3):449-455. 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 Cajeput Oil and Diphenhydramine Together: Common Questions

Is it safe to take Cajeput Oil with Diphenhydramine?

We do not list a known interaction between Cajeput Oil and Diphenhydramine. 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.

How was the Cajeput Oil and Diphenhydramine combination checked?

Interactions in our licensed database are recorded against drug classes. Diphenhydramine is filed under 7 classifications, and Cajeput Oil has documented interactions with 2 drug classes — none of Diphenhydramine'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 Cajeput Oil interact with any other medications?

Yes. Cajeput Oil has 278 documented drug interactions in our database — Diphenhydramine 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 Diphenhydramine interact with any supplements?

Yes. Diphenhydramine has documented interactions with 147 supplements in our database — Cajeput Oil is not one of them. The Diphenhydramine 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

Cajeput Oil monograph Uses, safety profile, and every drug interaction in one place Diphenhydramine drug information The full plain-English guide to this medication Diphenhydramine supplement interactions Every supplement checked against Diphenhydramine, 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 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Diphenhydramine and Cajeput Oil?

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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.