Drug & supplement interaction

Prohormones + Isoniazid

Isoniazid brand names: Laniazid, INH, Nydrazid.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Prohormones and Isoniazid 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

Prohormones and Isoniazid

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 Isoniazid and Prohormones 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 Prohormones at all — not against Isoniazid, 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.

Prohormones safety at a glance

Prohormones overall Avoid These hormone-altering compounds carry serious health risks and are best avoided without medical supervision.
Pregnancy Avoid Hormonal effects can harm a developing baby; do not use during pregnancy.
Breastfeeding Possibly Unsafe When used orally. Prohormones can be converted to active hormones in the body and cause adverse effects such as menstrual irregularities, infertility, hair loss... 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 Isoniazid and Prohormones? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Isoniazid’s Own FDA Label Lists

This is not an interaction — none of it involves Prohormones. These are the most notable effects listed in the ADVERSE REACTIONS section of Isoniazid’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.

  • Memory problems Worth acting on
  • Unsteadiness Worth acting on
  • A severe skin reaction Worth acting on mentioned in 4.6% of FDA reports for Isoniazid
  • Hallucinations Worth acting on
  • Pancreatitis Worth acting on
  • Yellowing of the skin or eyes Worth acting on
  • High blood sugar Worth acting on
  • Seizures Worth acting on
  • Liver problems Worth acting on mentioned in 5.4% of FDA reports for Isoniazid
  • A low platelet count Worth acting on

Showing the 10 most notable of 21 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 Isoniazid. Read the label on DailyMed › Where a percentage is shown, it is the share of 16,103 voluntary FDA FAERS reports for Isoniazid that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Prohormones’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Prohormones side to compare — that is a limit of the record, not a statement that Prohormones has no side effects.

Special populations

Prohormones in Pregnancy & Breastfeeding

Lactation Possibly Unsafe

When used orally. Prohormones can be converted to active hormones in the body and cause adverse effects such as menstrual irregularities, infertility, hair loss, and acne. Prohormones have also been associated with hepatotoxicity and increased risk of cardiovascular disease. The U.S. Food and Drug Administration and other regulatory agencies warn that dietary supplements containing prohormones are dangerous. Avoid using.

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 Prohormones or Isoniazid

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

This page covers Prohormones only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Isoniazid page lists 84 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Beer (major), Siberian Cocklebur (major), Wine (major) and Adrafinil (moderate).

By severity: 4 major · 67 moderate · 13 minor.

From our pharmacist’s overview on the Isoniazid page

“The liver does most of the worrying here. Isoniazid, a backbone of tuberculosis treatment, is already hard on the liver by itself, and 38 of the supplements on this list can add strain, from Siberian cocklebur, a major-rated entry, to everyday herbs like ashwagandha and black cohosh.”

Reviewed by 2 · Jul 18, 2026

Open the Isoniazid interaction page

How much people look this up

Where Prohormones and Isoniazid 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 Prohormones
Top half

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

29 days ago today
Medication Isoniazid
Steady interest

#2,580 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 Prohormones reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Prohormones and Isoniazid records this page draws on were last updated July 11, 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 Prohormones

What is Prohormones?

  • Muscle building
  • Strength and athletic performance
  • Body recomposition
  • Fat loss
  • Bodybuilding cycles

Prohormones are steroid-like compounds the body can convert into active anabolic hormones such as testosterone. They are marketed for muscle and strength gains, but they carry real risks to the liver, heart, and hormone balance, and many sold as supplements are legally and chemically questionable. We do not recommend them outside of medical supervision, and they should never be used during pregnancy or breastfeeding.

Synthetic or semi-synthetic steroidal compounds (not a plant part) · Capsules, tablets, powders

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

Prohormones: dosing

There is no established safe or standardized dose for prohormones, and we cannot recommend one. Products vary widely in their ingredients and strength, and labels are not always accurate.Because these compounds act like hormones and carry real risks, the safest approach is to avoid them unless you are under the care of a qualified medical provider.

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

Read the full Prohormones monograph & all interactions
Medication

About Isoniazid

What Is Isoniazid Used For?

Brand names: Laniazid, INH, Nydrazid

Isoniazid is used to treat all forms of tuberculosis (TB) caused by susceptible bacteria. Because TB bacteria can quickly become resistant to a single drug, isoniazid must always be combined with other anti-TB medications when treating active TB — it is never used alone for active disease.

Isoniazid is also used as preventive therapy (sometimes called latent TB treatment) for people who have a positive TB skin test but do not yet have active disease. This includes people with HIV infection, close contacts of someone with active TB, recent TB skin test converters, and people with certain medical conditions — such as silicosis, diabetes mellitus, end-stage renal disease, leukemia, or Hodgkin's disease — that raise their TB risk.

Most-Reported Side Effects for Isoniazid

From FAERS, the FDA’s public side-effect reporting system (16,103 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fever 1,102 reports
Nausea 903 reports
Drug-induced liver injury 862 reports
Drug reaction with eosinophilia and systemic symptoms 744 reports
Vomiting 637 reports
See full Isoniazid drug information
Keep checking

Other Drugs & Prohormones

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

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

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Prohormones list.

See the full Prohormones interactions page
See every supplement checked against Isoniazid, ranked by severity
Evidence & sources

Prohormones References

The 1 references that drive our Prohormones 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. Joseph JF, Parr MK. Synthetic androgens as designer supplements. Curr Neuropharmacol. 2015;13(1):89-100. 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 Prohormones and Isoniazid Together: Common Questions

Is it safe to take Prohormones with Isoniazid?
We do not list a known interaction between Prohormones and Isoniazid. 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 Isoniazid interact with any supplements?
Yes. Isoniazid has documented interactions with 84 supplements in our database — Prohormones is not one of them. The Isoniazid 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

Prohormones monograph Uses, safety profile, and every drug interaction in one place Isoniazid drug information The full plain-English guide to this medication Isoniazid supplement interactions Every supplement checked against Isoniazid, 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 1 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Isoniazid and Prohormones?

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.