Drug & supplement interaction

Shilajit + Famciclovir

Famciclovir brand name: Famvir.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Shilajit and Famciclovir 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.

Know someone taking this? Share
Facebook Post Reddit Email
On this page
Interaction report

Shilajit and Famciclovir

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 Famciclovir and Shilajit 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.

Shilajit safety at a glance

Shilajit overall Use caution Unpurified products may contain heavy metals or other contaminants, so only use purified, tested brands.
Pregnancy Avoid Not enough safety data and contamination risk, so it is best avoided during pregnancy.
Breastfeeding Avoid Safety is unknown while breastfeeding, so avoid it.

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

Still wondering about combining Famciclovir and Shilajit? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Famciclovir

Interactions in our licensed database are recorded against drug classes, not just single drug names. Famciclovir is filed under a single classification — oral drugs. Shilajit has documented interactions with 1 drug class — the most serious being antidiabetes drugs (moderate) — and none of Famciclovir’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

Shilajit Does Interact With Other Medications

Shilajit has 86 moderate known drug interactions in our database — Famciclovir isn’t one of them. If you take anything else, check it against the full list below.

Moderate 86 No known interaction 2,744 (incl. Famciclovir)
Taking anything else?

Check Another of Your Medications Against Shilajit

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

What to actually watch for

No Interaction Found — But Data Suggests Shilajit and Famciclovir May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. 2 of them are worth acting on rather than waiting out — marked below.

  • A severe allergic reaction / Hives Worth acting on Additional detail

    Shilajit

    “Orally, a case of allergy to shilajit made worse by exercise is reported in a 43-year-old female. Although symptoms were lacking when shilajit 400 mg was taken daily with meals for 3 months, she developed hives within an hour of taking a single dose of shilajit 800 mg. With intramuscular corticosteroids, symptoms improved but did not resolve.”

    Shilajit · Natural Medicines adverse-effect record, reported in allergic rhinitis (hay fever).

    1 source cited
    1. 112620. Losa F, Deidda M, Firinu D, Martino MLD, Barca MP, Giacco SD. Exercise-induced anaphylaxis with an Ayurvedic drug as cofactor: A case report. World J Clin Cases 2019;7(5):623-627. PubMed

    Famciclovir

    Listed in the ADVERSE REACTIONS section of the FDA label for Famciclovir. Read the label on DailyMed ›

  • Swelling Additional detail

    Shilajit

    “Orally, a case of apparent mineralocorticoid excess, or pseudohyperaldosteronism, with edema, increased urinary potassium, calcium, and magnesium loss, hypokalemia, and metabolic alkalosis, is reported in a 37-year-old female following the use of shilajit for 6 months during pregnancy. Product discontinuation and treatment with intravenous and oral potassium led to restoration of potassium levels.”

    Shilajit · Natural Medicines adverse-effect record, reported in hypokalemia.

    1 source cited
    1. 112622. Stavropoulos K, Sotiriadis A, Patoulias D, et al. Pseudohyperaldosteronism due to mumijo consumption during pregnancy: a licorice-like syndrome. Gynecol Endocrinol 2018;34(12):1019-1021. PubMed

    Famciclovir

    Listed in the ADVERSE REACTIONS section of the FDA label for Famciclovir. Read the label on DailyMed ›

  • Headache Additional detail

    Shilajit

    “Orally, headache is reported rarely following shilajit intake in clinical research.”

    Shilajit · Natural Medicines adverse-effect record, reported in cluster headache.

    1 source cited
    1. 112616. Sadeghi SMH, Hosseini Khameneh SM, Khodadoost M, et al. Efficacy of momiai in tibia fracture repair: A randomized double-blinded placebo-controlled clinical trial. J Altern Complement Med 2020;26(6):521-528.

    Famciclovir

    Listed in the ADVERSE REACTIONS section of the FDA label for Famciclovir. Read the label on DailyMed ›

Reported for Shilajit but not commonly for Famciclovir: raised blood pressure and low potassium.

Effects for Famciclovir come from the ADVERSE REACTIONS section of its FDA label; effects for Shilajit come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

From our Q&A

Questions About Shilajit or Famciclovir

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

This page covers Shilajit only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Famciclovir page lists 17 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).

By severity: 1 major · 7 moderate · 9 minor.

From our pharmacist’s overview on the Famciclovir page

“Famciclovir (Famvir) treats herpes infections like shingles and cold sores, and it only works if enough of the drug gets absorbed from your gut, which is exactly where every supplement on this list can interfere. The entry I would take most seriously is activated charcoal, the lone major-rated interaction, because charcoal binds medica…”

Reviewed by 2 · Jul 18, 2026

Open the Famciclovir interaction page

One more smart check

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

We hold 525 real supplement products containing Shilajit, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Shilajit. Even though Shilajit itself has no known interaction with Famciclovir, 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 Shilajit and Famciclovir 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 Shilajit
Top 25%

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

29 days ago today
Medication Famciclovir
Top half

#1,193 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 Shilajit reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Shilajit and Famciclovir 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 Shilajit

What is Shilajit?

  • Fatigue and low energy
  • Male fertility and testosterone support
  • General vitality and aging
  • Athletic performance
  • Cognitive support

Shilajit is a sticky, tar-like substance found in rocks of mountain ranges like the Himalayas, used in traditional Ayurvedic medicine for energy and vitality. Human evidence is limited and mostly small or early-stage, so its real benefits are uncertain. Quality and purity vary widely, and contamination with heavy metals is a real concern, so choose tested products and talk to your pharmacist before use.

Mineral exudate (resin) from rock layers · Resin, capsules, powder, tablets

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

Shilajit: dosing

There is no well-established standard dose for shilajit, and products vary a lot in strength and form. Choose products that have been independently tested for heavy metals and contaminants.

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

Read the full Shilajit monograph & all interactions
Medication

About Famciclovir

What Is Famciclovir Used For?

Brand name: Famvir

Famciclovir treats infections caused by herpes viruses in adults. It is used for recurrent cold sores (herpes labialis), recurrent genital herpes and shingles (herpes zoster).

It can also be used for suppressive therapy, which means daily treatment to help prevent recurrent genital herpes outbreaks. In adults with HIV, it treats recurrent episodes of cold sores around the mouth (orolabial herpes) or genital herpes.

See full Famciclovir drug information
Keep checking

Other Drugs & Shilajit

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

0Major
86Moderate
0Minor
2,743No known interaction
86 Moderate 2,743 No interaction
Moderate

86 interactions

Showing 60 of 86 moderate interactions — see all 86 on the Shilajit page.

No interaction 2,743 drugs checked — show the list

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

Showing the 60 most looked-up of 2,743 medications checked with no known interaction — see the full Shilajit list.

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

Shilajit References

The 8 references that drive our Shilajit 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. Sadeghi SMH, Hosseini Khameneh SM, Khodadoost M, et al. Efficacy of momiai in tibia fracture repair: A randomized double-blinded placebo-controlled clinical trial. J Altern Complement Med 2020;26(6):521-528.
  2. Losa F, Deidda M, Firinu D, Martino MLD, Barca MP, Giacco SD. Exercise-induced anaphylaxis with an Ayurvedic drug as cofactor: A case report. World J Clin Cases 2019;7(5):623-627. PubMed
  3. Biswas TK, Pandit S, Mondal S, et al. Clinical evaluation of spermatogenic activity of processed Shilajit in oligospermia. Andrologia 2010;42(1):48-56. PubMed
  4. Stavropoulos K, Sotiriadis A, Patoulias D, et al. Pseudohyperaldosteronism due to mumijo consumption during pregnancy: a licorice-like syndrome. Gynecol Endocrinol 2018;34(12):1019-1021. PubMed
  5. Ghezelbash B, Shahrokhi N, Khaksari M, Ghaderi-Pakdel F, Asadikaram G. Hepatoprotective effects of shilajit on high fat-diet induced non-alcoholic fatty liver disease (NAFLD) in rats. Horm Mol Biol Clin Investig 2020;41(1):/j/hmbci. PubMed
  6. Ghezelbash B, Shahrokhi N, Khaksari M, Asadikaram G, Shahrokhi M, Shirazpour S. Protective roles of shilajit in modulating resistin, adiponectin, and cytokines in rats with non-alcoholic fatty liver disease. Chin J Integr Med 2022;28(6):531-537. PubMed
  7. Jafari M, Forootanfar H, Ameri A, et al. Antioxidant, cytotoxic and hyperalgesia-suppressing activity of a native Shilajit obtained from Bahr Aseman mountains. Pak J Pharm Sci 2019;32(5):2167-2173. DOI
  8. Trivedi NA, Mazumdar B, Bhatt JD, Hemavathi KG. Effect of shilajit on blood glucose and lipid profile in alloxan-induced diabetic rats. Ind. J. Pharmacol. 2004; 36(6):373-376.

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 Shilajit and Famciclovir Together: Common Questions

Is it safe to take Shilajit with Famciclovir?
We do not list a known interaction between Shilajit and Famciclovir. 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.
Do Shilajit and Famciclovir have any of the same side effects?
Yes — our sources link each of them separately to 4 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
How was the Shilajit and Famciclovir combination checked?
Interactions in our licensed database are recorded against drug classes. Famciclovir is filed under 1 classification, and Shilajit has documented interactions with 1 drug class — none of Famciclovir'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 Shilajit interact with any other medications?
Yes. Shilajit has 86 documented drug interactions in our database — Famciclovir 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 Famciclovir interact with any supplements?
Yes. Famciclovir has documented interactions with 17 supplements in our database — Shilajit is not one of them. The Famciclovir 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

Shilajit monograph Uses, safety profile, and every drug interaction in one place Famciclovir drug information The full plain-English guide to this medication Famciclovir supplement interactions Every supplement checked against Famciclovir, 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 8 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Famciclovir and Shilajit?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.