Drug & supplement interaction

Camphor + Pretomanid

Pretomanid brand name: Pretomanid.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Camphor has a moderate interaction with Pretomanid. Theoretically, concomitant use of camphor with other hepatotoxic drugs might increase the risk of liver damage.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

Camphor and Pretomanid

Here is the interaction we found between these two, with the evidence behind it.

Moderate

HEPATOTOXIC DRUGS

Why this applies to Pretomanid

Pretomanid falls under HEPATOTOXIC DRUGS — the group Camphor interacts with.

Theoretically, concomitant use of camphor with other hepatotoxic drugs might increase the risk of liver damage.
There have been a few case reports of transient elevations in liver enzymes in adults after oral or topical use of camphor. There has also been one case of hepatotoxicity in an infant after topical camphor use.
Severity Moderate Likelihood Possible Evidence D

Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the gist: Pretomanid is one of the few medicines we have for hard-to-treat tuberculosis, and it is already known to be a little tough on the liver. Camphor, especially if any of it gets into your system, has been tied to occasional bumps in liver enzymes too. The worry is simple math: two things that can stress the liver, used together, might add up and raise the chance of liver irritation.

To be honest, this concern is theoretical, based on how each behaves rather than solid studies pairing them. Used properly on the skin in small amounts, camphor is unlikely to cause trouble. Never swallow camphor. Since you're on Pretomanid, just give your pharmacist or TB doctor a quick heads-up before using camphor products, and report any yellowing of the skin or eyes, dark urine, or belly pain.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Uc A, Bishop WP, Sanders KD. Camphor hepatotoxicity. South Med J 2000;93:596-8. DOI
  2. Rampini, S. K., Schneemann, M., Rentsch, K., and Bachli, E. B. Camphor intoxication after cao gio (coin rubbing). JAMA 7-3-2002;288(1):45.
  3. Cordoba Torres IT, Marino-Nieto J, Barkin HB, Fort AC, Cobas M. Vicks VapoRub intoxication: an unusual presentation of multiorgan failure. J Clin Anesth 2018;48:46-7. PubMed

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Camphor Also Interacts With Other Medications

Camphor has 369 moderate known drug interactions in our database — the Pretomanid one above is one of them. If you take anything else, check it against the full list below.

Moderate 369 No known interaction 2,461 (incl. Pretomanid)
Taking anything else?

Check Another of Your Medications Against Camphor

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

Everything else you take

See Every Supplement That Interacts With Pretomanid

This page covers Camphor only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Pretomanid page lists 143 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), Arsenic (major), Beer (major) and Cesium (major).

By severity: 10 major · 122 moderate · 11 minor.

From our pharmacist’s overview on the Pretomanid page

“Pretomanid is reserved for highly drug-resistant tuberculosis, and it can stress the liver and lengthen the heart's QT interval, so the supplements on this page deserve genuine care. Ten of the 143 ingredients on file carry a major rating, and nearly all of those either compound the liver risk (alcohol in beer or wine is the plainest e…”

Reviewed by 2 · Jul 18, 2026

Open the Pretomanid interaction page

One more smart check

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

We hold 51 real supplement products containing Camphor, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Camphor. Your product may carry other ingredients that interact with Pretomanid too, on top of Camphor — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Camphor and Pretomanid 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 Camphor
Steady interest

#1,364 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Pretomanid
Steady interest

#2,379 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.

Supplement

About Camphor

What is Camphor?

  • Muscle and joint aches
  • Cough and chest congestion
  • Itching and skin irritation
  • Cold sores or minor wounds
  • Counterirritant for pain

Camphor is a strong-smelling compound from the camphor tree (or made synthetically) that is used in many topical rub-on products for muscle aches, itching, and chest congestion. It can be helpful for these uses when applied to the skin in small, regulated amounts, but it is toxic and potentially deadly if swallowed, so it should never be taken by mouth. Keep camphor products away from children and check with a pharmacist before use.

Read the full Camphor monograph & all interactions
Medication

About Pretomanid

What Is Pretomanid Used For?

Brand name: Pretomanid

Pretomanid Tablet is used only as part of a three-drug regimen — together with bedaquiline and linezolid — to treat adults with pulmonary (lung) tuberculosis that is resistant to multiple antibiotics, including isoniazid, rifamycins, a fluoroquinolone, and a second-line injectable TB drug. It is also used for adults whose TB is resistant to isoniazid and rifampin and who cannot tolerate or are not responding to standard TB therapy.

Pretomanid Tablets are not for drug-sensitive TB, latent (inactive) TB infection, TB outside the lungs, or TB that responds to standard treatment. They should only be used in combination with bedaquiline and linezolid — safety and effectiveness with other drug combinations have not been established.

See full Pretomanid drug information
Keep checking

Other Drugs & Camphor

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

0Major
369Moderate
0Minor
2,460No known interaction
369 Moderate 2,460 No interaction
Moderate

369 interactions

Showing 60 of 369 moderate interactions — see all 369 on the Camphor page.

No interaction 2,460 drugs checked — show the list

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

Showing the 60 most looked-up of 2,460 medications checked with no known interaction — see the full Camphor list.

See the full Camphor interactions page
See every supplement checked against Pretomanid, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Camphor monograph › Uses, safety, and every drug interaction in one place Pretomanid supplement interactions › Every supplement checked against Pretomanid, ranked by severity Pretomanid drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Camphor and Pretomanid Together: Common Questions

Can you take Camphor with Pretomanid?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Camphor and Pretomanid interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Pretomanid and Camphor?

Our pharmacists answer your medication & supplement questions — free.

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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.