Drug & supplement interaction

Deer Velvet + Leflunomide

Leflunomide brand name: Arava.

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

We found no known interaction between Deer Velvet and Leflunomide 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

Deer Velvet and Leflunomide

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 Leflunomide and Deer Velvet 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.

Deer Velvet safety at a glance

Deer Velvet overall Use caution It appears generally well tolerated in short-term use, but long-term safety and product quality are not well studied.
Pregnancy Avoid There is not enough safety information, so it is best avoided during pregnancy.
Breastfeeding Avoid There is not enough safety information, so it is best avoided while breastfeeding.

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

Still wondering about combining Leflunomide and Deer Velvet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Leflunomide

Interactions in our licensed database are recorded against drug classes, not just single drug names. Leflunomide is filed under 3 classifications — cytochrome p450 2c9 (cyp2c9) inhibitors, hepatotoxic drugs, oral drugs. Deer Velvet has documented interactions with 2 drug classes — the most serious being contraceptive drugs (minor) and estrogens (minor) — and none of Leflunomide’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

Deer Velvet Does Interact With Other Medications

Deer Velvet has 52 minor known drug interactions in our database — Leflunomide isn’t one of them. If you take anything else, check it against the full list below.

Minor 52 No known interaction 2,778 (incl. Leflunomide)
Taking anything else?

Check Another of Your Medications Against Deer Velvet

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

What to actually watch for

What Leflunomide’s Own FDA Label Lists

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

  • Blood clots Worth acting on
  • Pancreatitis Worth acting on
  • Yellowing of the skin or eyes Worth acting on
  • A severe skin reaction Worth acting on
  • Chest pain Worth acting on
  • A low platelet count Worth acting on
  • Raised blood pressure Worth acting on
  • Shortness of breath Worth acting on
  • A severe allergic reaction Worth acting on
  • A low white blood cell count Worth acting on

Showing the 10 most notable of 35 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 Leflunomide. Read the label on DailyMed › Where a percentage is shown, it is the share of 104,033 voluntary FDA FAERS reports for Leflunomide that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Deer Velvet’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Deer Velvet side to compare — that is a limit of the record, not a statement that Deer Velvet has no side effects.

Everything else you take

See Every Supplement That Interacts With Leflunomide

This page covers Deer Velvet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Leflunomide page lists 59 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 Ashwagandha (moderate).

By severity: 4 major · 46 moderate · 9 minor.

From our pharmacist’s overview on the Leflunomide page

“Leflunomide (Arava) quiets rheumatoid arthritis by damping down the immune system, and its best-known danger is liver injury, so the 59 supplements and herbs on this page are worth slowing down for. Thirty-eight of them carry liver risks of their own, and of the four rated major, two are simply alcoholic drinks, while a third, Siberian…”

Reviewed by 2 · Jul 18, 2026

Open the Leflunomide interaction page

One more smart check

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

We hold 249 real supplement products containing Deer Velvet, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Deer Velvet. Even though Deer Velvet itself has no known interaction with Leflunomide, 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 Deer Velvet and Leflunomide 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 Deer Velvet
Top 25%

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

29 days ago today
Medication Leflunomide
Steady interest

#2,319 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 Deer Velvet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Deer Velvet and Leflunomide 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 .
Supplement

About Deer Velvet

What is Deer Velvet?

Deer Velvet
  • Athletic performance and strength
  • Energy and fatigue
  • Joint health and arthritis
  • Immune support
  • Sexual function and libido

Deer velvet is a traditional remedy made from the soft, growing antlers of deer or elk, and it is most often promoted for energy, athletic performance, and joint health. Good-quality human evidence is limited, and most claims are not well proven. Talk to your pharmacist or doctor before using it, and avoid it during pregnancy and breastfeeding.

Cervus nippon · Cervidae · Soft, growing antler (velvet) tissue, including the skin, cartilage, and bone, from male deer or elk · Capsules, tablets, powders, extracts, sprays, and teas

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

Deer Velvet: dosing

There is no standardized or well-established dose for deer velvet. Products differ widely in strength, form, and how they are processed, so amounts on labels are not consistent.If you choose to use it, follow the directions on the product label and do not exceed the recommended amount.

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

Read the full Deer Velvet monograph & all interactions
Medication

About Leflunomide

What Is Leflunomide Used For?

Brand name: Arava

Leflunomide tablets — sold under the brand name Arava and as generic leflunomide — are used to treat active rheumatoid arthritis (RA) in adults. Both Arava and generic leflunomide tablets are FDA-approved for this use.

Rheumatoid arthritis is an autoimmune condition in which the immune system attacks the joints, causing pain, swelling, and stiffness. Leflunomide helps calm that overactive immune response to reduce symptoms and slow joint damage.

Most-Reported Side Effects for Leflunomide

From FAERS, the FDA’s public side-effect reporting system (104,033 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Rheumatoid arthritis 25,337 reports
Arthralgia 17,395 reports
Drug intolerance 15,935 reports
Joint swelling 15,925 reports
Fatigue 15,756 reports
See full Leflunomide drug information
Keep checking

Other Drugs & Deer Velvet

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

0Major
0Moderate
52Minor
2,777No known interaction
52 Minor 2,777 No interaction
Minor

52 interactions

No interaction 2,777 drugs checked — show the list

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

Showing the 60 most looked-up of 2,777 medications checked with no known interaction — see the full Deer Velvet list.

See the full Deer Velvet interactions page
See every supplement checked against Leflunomide, ranked by severity
Evidence & sources

Deer Velvet References

The 2 references that drive our Deer Velvet 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. Sleivert, G., Burke, V., Palmer, C., Walmsley, A., Gerrard, D., Haines, S., and Littlejohn, R. The effects of deer antler velvet extract or powder supplementation on aerobic power, erythropoiesis, and muscular strength and endurance characteristics. Int PubMed
  2. Bubenik, G. A., Miller, K. V., Lister, A. L., Osborn, D. A., Bartos, L., and van der Kraak, G. J. Testosterone and estradiol concentrations in serum, velvet skin, and growing antler bone of male white-tailed deer. J Exp Zoolog.A Comp Exp Biol 3-1-2005;30 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 Deer Velvet and Leflunomide Together: Common Questions

Is it safe to take Deer Velvet with Leflunomide?
We do not list a known interaction between Deer Velvet and Leflunomide. 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 Deer Velvet and Leflunomide combination checked?
Interactions in our licensed database are recorded against drug classes. Leflunomide is filed under 3 classifications, and Deer Velvet has documented interactions with 2 drug classes — none of Leflunomide'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 Deer Velvet interact with any other medications?
Yes. Deer Velvet has 52 documented drug interactions in our database — Leflunomide 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 Leflunomide interact with any supplements?
Yes. Leflunomide has documented interactions with 59 supplements in our database — Deer Velvet is not one of them. The Leflunomide 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

Deer Velvet monograph Uses, safety profile, and every drug interaction in one place Leflunomide drug information The full plain-English guide to this medication Leflunomide supplement interactions Every supplement checked against Leflunomide, 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 Leflunomide and Deer Velvet?

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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.