Herb & supplement monograph

Vitamin A Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Vitamin A interacts with medications. The heart of this page is the interaction list — every drug Vitamin A is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Vitamin A is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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On this page

Vitamin A Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Vitamin A drug interaction appears low for most people who keep their intake within recommended limits. Nearly all of the listed interactions are rated moderate, rest on theoretical or limited evidence, and mainly involve high doses of vitamin A rather than typical supplement amounts.

Interactions deserving the most attention

The clearest concern is with retinoids, prescription medicines derived from vitamin A, where adding a supplement can push vitamin A to toxic levels; this combination has the best-documented risk. High doses also deserve care with warfarin, since vitamin A toxicity has been linked to bleeding and may work against vitamin K. With tetracycline antibiotics, case reports suggest high-dose vitamin A may raise the chance of increased pressure inside the skull.

What the rest of the list means

The long list of interacting medications does not mean every combination is harmful. Most entries reflect a theoretical worry, largely that very high vitamin A doses could add to liver strain when combined with medicines that can also affect the liver. At everyday supplement doses, these predicted effects have not been shown to cause meaningful problems for most people.

Check your medications against Vitamin A

Based on HelloPharmacist’s Vitamin A interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Vitamin A

389 medications have a known interaction with Vitamin A, graded by severity. Select any drug for the full evidence-based detail.

9 major interactions. These combinations can be clinically significant — best avoided, or used only with close professional supervision. Always check with your pharmacist before combining them with Vitamin A.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Vitamin A using our pharmacist-reviewed interaction data.

AI summaries are generated from our Vitamin A interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction 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.
Possible. 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
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Vitamin A combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Vitamin A affects

Every type of medication (drug category) Vitamin A is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 4 drug categories Vitamin A interacts with

RetinoidsHepatotoxic DrugsTetracycline AntibioticsWarfarin (coumadin)

Retinoids

Concomitant use of retinoids with vitamin A supplements might produce supratherapeutic vitamin A levels.
Retinoids, which are vitamin A derivatives, could have additive toxic effects when taken with vitamin A supplements.

Likelihood Probable Evidence D

Hepatotoxic Drugs

Theoretically, taking high doses of vitamin A in combination with other potentially hepatotoxic drugs might increase the risk of liver disease.
The tolerable upper intake level (UL) is the highest level of intake that is likely to pose no risk of adverse effects. Doses of vitamin A above the UL can cause hepatotoxicity, ranging from elevated liver enzymes to liver failure.

Likelihood Possible Evidence C

Tetracycline Antibiotics

Theoretically, taking tetracycline antibiotics with high doses of vitamin A can increase the risk of pseudotumor cerebri.
Benign intracranial hypertension (pseudotumor cerebri) can occur with tetracyclines and with acute or chronic vitamin A toxicity. Case reports suggest that taking tetracyclines and vitamin A concurrently can increase the risk of this condition. Avoid high doses of vitamin A in people taking tetracyclines chronically.

Likelihood Possible Evidence D

Warfarin (Coumadin)

Theoretically, high doses of vitamin A could increase the risk of bleeding with warfarin.
Vitamin A toxicity is associated with hemorrhage and hypoprothrombinemia, possibly due to vitamin K antagonism. Advise patients taking warfarin to avoid doses of vitamin A above the tolerable upper intake level of 10,000 IU/day for adults.

Likelihood Possible Evidence D

Monograph

Vitamin A: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Vitamin A is an essential nutrient important for vision, skin, immune function, and growth. Most people get enough from a balanced diet, and supplements are mainly useful for correcting a true deficiency. Because vitamin A is fat-soluble and can build up to harmful levels, more is not better, and high doses are especially risky in pregnancy.

Common forms: Capsules, softgels, tablets, liquid drops, multivitamins; also found in foods

People commonly use it for

Eye and vision health
Skin health and acne
Immune support
Correcting vitamin A deficiency
Childhood growth and development

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally safe at recommended amounts, but high doses can be toxic because it builds up in the body.

PregnancyLikely Safe

When used orally or intramuscularly and appropriately. Vitamin A, as pre-formed vitamin A (retinol or retinyl ester), is safe during pregnancy and lac...

Read the full pregnancy detail

BreastfeedingLikely Safe

When used orally or intramuscularly and appropriately. Vitamin A, as pre-formed vitamin A (retinol or retinyl ester), is safe during pregnancy and lac...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Vitamin A is an essential, fat-soluble vitamin that your body needs but cannot make on its own. It comes in two main forms. Preformed vitamin A (retinol and retinyl esters) is found in animal foods like liver, fish, eggs, and dairy. Provitamin A carotenoids, such as beta-carotene, come from colorful fruits and vegetables and can be turned into vitamin A inside the body.

Most people get the vitamin A they need from food. Supplements are commonly used to prevent or treat a deficiency, support eye and skin health, and help the immune system. It is sold alone or as part of multivitamins, and it is also given in public health programs in parts of the world where deficiency is common.

How it works

Vitamin A is converted in the body into active forms, including retinal and retinoic acid. Retinal is part of a pigment in the eye that lets you see in dim light, which is why a shortage causes night blindness.

Retinoic acid acts like a signal that helps control how certain genes are turned on and off. Through this, vitamin A supports the growth and repair of skin and the linings of the body, normal cell development, and a healthy immune response. Carotenoids like beta-carotene also act as antioxidants. Much of the detailed mechanism comes from laboratory and animal research, but vitamin A's core role in vision and growth is well established in humans.

Effectiveness

Does Vitamin A work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 67 uses evaluated

1 Effective 9 Possibly effective 9 Leans ineffective 48 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Effective Vitamin A deficiency