Drug & supplement interaction

Camphor + Phenazopyridine, Sulfamethizole

Phenazopyridine, Sulfamethizole brand names: Thiosulfil-A, Thiosulfil-A Forte.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Camphor and Phenazopyridine, Sulfamethizole 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

Camphor and Phenazopyridine, Sulfamethizole

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 Phenazopyridine, Sulfamethizole and Camphor 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.

Camphor safety at a glance

Camphor overall Use caution Generally tolerated for short-term topical use in regulated amounts, but toxic and dangerous if swallowed or overused.
Pregnancy Unsafe When used orally. Ingestion of camphor can cause serious toxicity including death. There is insufficient reliable information available about the safety of usin... Read the full pregnancy detail
Breastfeeding Unsafe When used orally. Ingestion of camphor can cause serious toxicity including death. There is insufficient reliable information available about the safety of usin... 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 Phenazopyridine, Sulfamethizole and Camphor? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Phenazopyridine, Sulfamethizole

Interactions in our licensed database are recorded against drug classes, not just single drug names. Phenazopyridine, Sulfamethizole is filed under 2 classifications — antibiotic drugs, oral drugs. Camphor has documented interactions with 1 drug class — the most serious being hepatotoxic drugs (moderate) — and none of Phenazopyridine, Sulfamethizole’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

Camphor Does Interact With Other Medications

Camphor has 370 moderate known drug interactions in our database — Phenazopyridine, Sulfamethizole isn’t one of them. If you take anything else, check it against the full list below.

Moderate 370 No known interaction 2,460 (incl. Phenazopyridine, Sulfamethizole)
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.

What to actually watch for

What Camphor Itself Has Been Linked To

This is not an interaction — nothing below involves Phenazopyridine, Sulfamethizole. It is the side-effect record for Camphor on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Camphor, this list is the first place to look. 5 entries are worth acting on rather than waiting out — marked below.

  • Wheezing / Shortness of breath Worth acting on Additional detail

    “When inhaled in large enough concentrations, camphor can irritate the nose and sinuses. However, it is difficult to determine a safe concentration of inhaled camphor.

    A 54-year-old females with a history of asthma developed shortness of breath, hypoxemia, and respiratory acidosis after oral ingestion of Vicks VapoRub, containing 4.8% camphor.”

    Camphor · Natural Medicines adverse-effect record, reported in asthma.

    2 sources cited
    1. 105033. Camphor (synthetic): Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health. 1994. https://www.cdc.gov/niosh/idlh/76222.html. Assessed 5/6/2021.
    2. 97260. 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
  • An irregular heartbeat Worth acting on Additional detail

    “Case reports of intoxication due to accidental or intentional consumption have included peripheral circulatory shock and sinus tachycardia. A 54-year-old female with a history of cardiomyopathy and atrial fibrillation developed several episodes of ventricular tachycardia and fibrillation requiring use of a defibrillator after ingestion of Vicks VapoRub, containing 4.8% camphor.”

    Camphor · Natural Medicines adverse-effect record, reported in atrial fibrillation.

    3 sources cited
    1. 39649. Vasey, R. H. and Karayannopoulos, S. J. Camphorated oil. Br.Med.J. 1-8-1972;1(5792):112.
    2. 97261. Rahimi M, Shokri F, Hassanian-Moghaddam H, et al. Severe camphor poisoning, a seven-year observational study. Environ Toxicol Pharmacol 2017;52:8-13. PubMed
    3. 97260. 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
  • Confusion Worth acting on Additional detail

    “Orally, camphor can cause significant toxicity. Neurological symptoms occur with ingestion of greater than 50 mg/kg. These symptoms include irritability, exaggerated tendon reflexes, tonic muscular contraction, myoclonic jerks, seizures, confusion, coma, and apnea. Seizures are sometimes the first manifestation of serious toxicity.”

    Camphor · Natural Medicines adverse-effect record, reported in common cold.

    6 sources cited
    1. 13442. Love JN, Sammon M, Smereck J. Are one or two dangerous? Camphor exposure in toddlers. J Emerg Med 2004;27:49-54.. PubMed
    2. 13444. Gouin S, Patel H. Unusual cause of seizure. Pediatr Emerg Care 1996;12:298-300. DOI
    3. 39560. Emery, D. P. and Corban, J. G. Camphor toxicity. J.Paediatr.Child Health 1999;35(1):105-106.
    4. 39589. SMITH, A. G. and MARGOLIS, G. Camphor poisoning; anatomical and pharmacologic study; report of a fatal case; experimental investigation of protective action of barbiturate. Am.J.Pathol. 1954;30(5):857-869.
    5. 39629. Agarwal, A. and Malhotra, H. S. Camphor ingestion: an unusual cause of seizure. J.Assoc.Physicians India 2008;56:123-124.
    6. 39646. Weiss, J. and Catalano, P. Camphorated oil intoxication during pregnancy. Pediatrics 1973;52(5):713-714. DOI
  • Seizures Worth acting on Additional detail

    “Orally, camphor is unsafe and can cause significant toxicity. Topically and by inhalation, camphor seems to be generally well-tolerated.

    Most Common Adverse Effects:

    Oral: Gastrointestinal and ocular symptoms of toxicity can occur within 5-90 minutes of ingestion.”

    Camphor · Natural Medicines adverse-effect record, reported in depression.

  • Liver problems / Bleeding or bruising Worth acting on Additional detail

    “Orally, camphor can cause transient elevations of liver enzymes in both adults and children. There is also a report of increased liver enzymes in an infant who received a camphor-containing topical cold remedy. The enzymes affected included aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase, and lactate dehydrogenase (LDH).”

    Camphor · Natural Medicines adverse-effect record, reported in common cold.

    3 sources cited
    1. 4608. Uc A, Bishop WP, Sanders KD. Camphor hepatotoxicity. South Med J 2000;93:596-8. DOI
    2. 39576. 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. 97260. 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
  • Mood changes or irritability Additional detail

    Recorded for Camphor in the same Natural Medicines adverse-effect record shown under Confusion above.

  • A fast or pounding heartbeat Additional detail

    Recorded for Camphor in the same Natural Medicines adverse-effect record shown under An irregular heartbeat above.

  • A skin rash Additional detail

    Recorded for Camphor in the same Natural Medicines adverse-effect record shown under Seizures above.

Showing the 10 most notable of 12 recorded effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

Everything above comes from the Natural Medicines adverse-effect record for Camphor — expand a row for the licensed statement it rests on. We haven’t matched Phenazopyridine, Sulfamethizole 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 Phenazopyridine, Sulfamethizole.

Special populations

Camphor in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally. Ingestion of camphor can cause serious toxicity including death. There is insufficient reliable information available about the safety of using camphor topically during pregnancy and lactation.

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

Everything else you take

See Every Supplement That Interacts With Phenazopyridine, Sulfamethizole

This page covers Camphor only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phenazopyridine, Sulfamethizole page lists 44 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Bacillus Coagulans (moderate), Bacillus Subtilis (moderate), Bifidobacterium Animalis Subsp. Lactis (moderate) and Bifidobacterium Bifidum (moderate).

By severity: 1 major · 33 moderate · 10 minor.

From our pharmacist’s overview on the Phenazopyridine, Sulfamethizole page

“Phenazopyridine with sulfamethizole (Thiosulfil-A) pairs a sulfa antibiotic with a urinary pain reliever, usually prescribed for a bladder infection, and this list deserves real attention, not a glance. The single major-rated interaction among the 44 ingredients on file is activated charcoal, which can bind the medication in the gut an…”

Reviewed by 2 · Jul 18, 2026

Open the Phenazopyridine, Sulfamethizole 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. Even though Camphor itself has no known interaction with Phenazopyridine, Sulfamethizole, 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 Camphor and Phenazopyridine, Sulfamethizole 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

#1,078 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Phenazopyridine, Sulfamethizole
Top 10%

#276 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 Camphor reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Camphor and Phenazopyridine, Sulfamethizole 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 .
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.

Cinnamomum camphora · Lauraceae · Wood, bark, and essential oil (camphor is also made synthetically) · Topical creams, ointments, balms, salves, vapor rubs, oils, inhalants, and liniments

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

Camphor: dosing

There is no established 'supplement' dose for camphor because it should not be taken by mouth. For skin products, the amount of camphor is regulated and listed on the label. Over-the-counter topical products typically contain camphor at low percentages.Always follow the directions on the product label, and do not apply more often or in larger amounts than directed. Use only finished products meant for skin use — never raw or homemade camphor preparations.

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

Read the full Camphor monograph & all interactions
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
370Moderate
0Minor
2,459No known interaction
370 Moderate 2,459 No interaction
Moderate

370 interactions

Showing 60 of 370 moderate interactions — see all 370 on the Camphor page.

No interaction 2,459 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 2,459 medications checked with no known interaction — see the full Camphor list.

See the full Camphor interactions page
See every supplement checked against Phenazopyridine, Sulfamethizole, ranked by severity
Evidence & sources

Camphor References

The 20 references that drive our Camphor 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.

  1. Uc A, Bishop WP, Sanders KD. Camphor hepatotoxicity. South Med J 2000;93:596-8. DOI
  2. Love JN, Sammon M, Smereck J. Are one or two dangerous? Camphor exposure in toddlers. J Emerg Med 2004;27:49-54.. PubMed
  3. Ruha AM, Graeme KA, Field A. Late seizure following ingestion of Vicks VapoRub. Acad Emerg Med 2003;10:691. . PubMed
  4. Gouin S, Patel H. Unusual cause of seizure. Pediatr Emerg Care 1996;12:298-300. DOI
  5. Ernst E. Adverse effects of herbal drugs in dermatology. Br J Dermatol 2000;143:923-9. PubMed
  6. Fung AE, Oxford KW. Microwave-superheated Vics Vapo Rub: an ocular public health danger. Am J Ophthalmol 2004;137:379-80. PubMed
  7. Emery, D. P. and Corban, J. G. Camphor toxicity. J.Paediatr.Child Health 1999;35(1):105-106.
  8. 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.
  9. SMITH, A. G. and MARGOLIS, G. Camphor poisoning; anatomical and pharmacologic study; report of a fatal case; experimental investigation of protective action of barbiturate. Am.J.Pathol. 1954;30(5):857-869.
  10. Ragucci, K. R., Trangmar, P. R., Bigby, J. G., and Detar, T. D. Camphor ingestion in a 10-year-old male. South.Med.J. 2007;100(2):204-207. PubMed
  11. Agarwal, A. and Malhotra, H. S. Camphor ingestion: an unusual cause of seizure. J.Assoc.Physicians India 2008;56:123-124.
  12. Weiss, J. and Catalano, P. Camphorated oil intoxication during pregnancy. Pediatrics 1973;52(5):713-714. DOI
  13. Vasey, R. H. and Karayannopoulos, S. J. Camphorated oil. Br.Med.J. 1-8-1972;1(5792):112.
  14. Mascie-Taylor, B. H., Widdop, B., and Davison, A. M. Camphor intoxication treated by charcoal haemoperfusion. Postgrad.Med.J. 1981;57(673):725-726. PubMed
  15. Theis, J. G. and Koren, G. Camphorated oil: still endangering the lives of Canadian children. CMAJ. 6-1-1995;152(11):1821-1824.

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 Camphor and Phenazopyridine, Sulfamethizole Together: Common Questions

Is it safe to take Camphor with Phenazopyridine, Sulfamethizole?
We do not list a known interaction between Camphor and Phenazopyridine, Sulfamethizole. 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 Camphor and Phenazopyridine, Sulfamethizole combination checked?
Interactions in our licensed database are recorded against drug classes. Phenazopyridine, Sulfamethizole is filed under 2 classifications, and Camphor has documented interactions with 1 drug class — none of Phenazopyridine, Sulfamethizole'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 Camphor interact with any other medications?
Yes. Camphor has 370 documented drug interactions in our database — Phenazopyridine, Sulfamethizole 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 Phenazopyridine, Sulfamethizole interact with any supplements?
Yes. Phenazopyridine, Sulfamethizole has documented interactions with 44 supplements in our database — Camphor is not one of them. The Phenazopyridine, Sulfamethizole 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

Camphor monograph Uses, safety profile, and every drug interaction in one place Phenazopyridine, Sulfamethizole supplement interactions Every supplement checked against Phenazopyridine, Sulfamethizole, 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 20 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Phenazopyridine, Sulfamethizole and Camphor?

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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.