Herb & supplement monograph

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

But these pages have grown well beyond that into a full monograph — what Zinc 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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Zinc 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 Zinc drug interaction appears low for most people. None of the listed interactions are rated major, and nearly all involve zinc binding a medicine in the gut and lowering its absorption rather than causing any harmful buildup.

Interactions deserving the most attention

We see the strongest human evidence with antibiotics: zinc can bind quinolone and tetracycline antibiotics in the gut and cut their absorption by roughly a third, which could leave an infection undertreated. A similar, well-documented effect happens with cephalexin, and zinc can blunt the benefit of lower doses of penicillamine. Zinc also modestly lowers levels of some HIV medicines, including ritonavir, so people on HIV treatment should be aware of this pattern.

What the rest of the list means

The rest of the long list is less worrying than it looks. Many entries are theoretical, predicted from lab or animal research or from how similar minerals behave, and some predicted effects, such as a meaningful drop in atazanavir levels, have not proved clinically significant in people. In most cases the issue is absorption when medicines are taken together, not a dangerous combination.

Check your medications against Zinc

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

Interaction report

Drugs that interact with Zinc

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

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

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

AI summaries are generated from our Zinc 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 Zinc 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 Zinc affects

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

All 10 drug categories Zinc interacts with

Bictegravir/emtricitabine/tenofovir Alafenamide (biktarvy)Cephalexin (keflex)Cisplatin (platinol-aq)Integrase InhibitorsPenicillamine (cuprimine, Depen)Quinolone AntibioticsRitonavir (norvir)Tetracycline AntibioticsAmiloride (midamor)Atazanavir (reyataz)

Bictegravir/Emtricitabine/Tenofovir Alafenamide (Biktarvy)

Theoretically, zinc might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption.
Advise patients that bictegravir/emtricitabine/tenofovir alafenamide should be taken at least 2 hours before or 6 hours after zinc containing products.

Likelihood Probable Evidence D

Cephalexin (Keflex)

Zinc might decrease cephalexin levels by chelating with cephalexin in the gut and preventing its absorption.
A pharmacokinetic study shows that zinc sulfate 250 mg taken concomitantly with cephalexin 500 mg decreases peak levels of cephalexin by 31% and reduces the exposure to cephalexin by 27%. Also, taking zinc sulfate 3 hours before cephalexin decreases peak levels of cephalexin by 11% and reduces the exposure to cephalexin by 18%. By decreasing cephalexin levels, zinc might increase the risk of treatment failure. This effect does not occur when zinc is taken 3 hours after the cephalexin dose. To avoid an interaction, advise patients take zinc sulfate 3 hours after taking cephalexin.

Likelihood Probable Evidence B

Cisplatin (Platinol-Aq)

Theoretically, zinc might interfere with the therapeutic effects of cisplatin.
Animal research suggests that zinc stimulates tumor cell production of the protein metallothionein, which binds and inactivates cisplatin. It is not known whether zinc supplements or high dietary zinc intake can cause clinically significant interference with cisplatin therapy. Cisplatin might also increase zinc excretion.

Likelihood Possible Evidence D

Integrase Inhibitors

Theoretically, taking zinc along with integrase inhibitors might decrease the levels and clinical effects of these drugs.
Zinc is a divalent cation. Pharmacokinetic studies have shown that other divalent cations such as calcium and iron can decrease blood levels of the integrase inhibitor dolutegravir through chelation.

Likelihood Possible Evidence D

Penicillamine (Cuprimine, Depen)

Zinc might reduce the levels and clinical effects of penicillamine.
By forming an insoluble complex with penicillamine, zinc interferes with penicillamine absorption and activity. Zinc supplements reduce the efficacy of low-dose penicillamine (0.5-1 gram/day), but do not seem to affect higher doses (1-2.75 gram/day), provided dosing times are separated. Advise patients to take zinc and penicillamine at least 2 hours apart.

Likelihood Probable Evidence B

Quinolone Antibiotics

Zinc can decrease the levels and clinical effects of quinolones antibiotics.
Quinolones form complexes with zinc in the gastrointestinal tract, reducing absorption of both the quinolone and zinc if taken at the same time. Advise patients to take these drugs at least 2 hours before, or 4-6 hours after, zinc supplements.

Likelihood Probable Evidence B

Ritonavir (Norvir)

Zinc modestly reduces levels of ritonavir.
Clinical research shows that zinc might reduce serum ritonavir levels by chelating with ritonavir in the gut and preventing its absorption. In patients with HIV, ritonavir is taken with atazanavir to prevent the metabolism and increase the effects of atazanavir. A pharmacokinetic study shows that, in patients being treated with atazanavir/ritonavir, co-administration of zinc sulfate (Solvazinc tablets) 125 mg as a single dose or as multiple daily doses for 2 weeks reduces plasma levels of ritonavir by about 16%. However, atazanavir levels still remains high enough to prevent HIV virus replication. Therefore, the decrease in ritonavir levels is not likely to be clinically significant.

Likelihood Probable Evidence B

Tetracycline Antibiotics

Zinc might reduce levels of tetracycline antibiotics.
Tetracyclines form complexes with zinc in the gastrointestinal tract, which can reduce absorption of both the tetracycline and zinc when taken at the same time. Taking zinc sulfate 200 mg with tetracycline reduces absorption of the antibiotic by 30% to 40%. Demeclocycline and minocycline cause a similar interaction. However, doxycycline does not seem to interact significantly with zinc. Advise patients to take tetracyclines at least 2 hours before, or 4-6 hours after, zinc supplements to avoid any interactions.

Likelihood Probable Evidence B

Amiloride (Midamor)

Amiloride can modestly reduce zinc excretion and increase zinc levels.
Clinical research shows that amiloride can reduce urinary zinc excretion, especially at doses of 10 mg per day or more. This zinc-sparing effect can help to counteract zinc losses caused by thiazide diuretics, but it is unlikely to cause zinc toxicity at usual amiloride doses. The other potassium-sparing diuretics, spironolactone (Aldactone) and triamterene (Dyrenium), do not seem to have a zinc-sparing effect.

Likelihood Probable Evidence B

Atazanavir (Reyataz)

Zinc modestly reduces levels of atazanavir, although this effect does not seem to be clinically significant.
Clinical research shows that zinc might decrease serum atazanavir levels by chelating with atazanavir in the gut and preventing its absorption. Although a single dose of zinc sulfate (Solvazinc tablets) 125 mg orally does not affect atazanavir concentrations in patients being treated with atazanavir/ritonavir, co-administration of zinc sulfate 125 mg daily for 2 weeks reduces plasma levels of atazanavir by about 22% in these patients. However, despite this decrease, atazanavir levels still remain at high enough concentrations for the prevention of HIV virus replication.

Likelihood Probable Evidence B

Monograph

Zinc: Uses, Safety & Side Effects

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

The bottom line

Zinc is an essential mineral that your body needs for immune function, wound healing, taste, and smell. Most people get enough from food, but supplements can help correct or prevent a deficiency. Taking too much zinc for too long can cause harm, so check with a pharmacist or doctor before using high-dose supplements.

Part used: Not applicable (an essential mineral)
Common forms: Tablets, capsules, lozenges, liquid, and topical creams

People commonly use it for

Zinc deficiency
Immune support
Cold symptoms
Acne
Wound healing

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

Safety at a glance

OverallUse caution

Generally safe in recommended amounts, but high doses can be harmful.

PregnancyLikely Safe

When used orally and appropriately. Zinc is safe in amounts that do not exceed the tolerable upper intake level (UL) of 34 mg daily during pregnancy i...

Read the full pregnancy detail

BreastfeedingLikely Safe

When used orally and appropriately. Zinc is safe in amounts that do not exceed the tolerable upper intake level (UL) of 34 mg daily during lactation i...

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

Zinc is a mineral that your body needs in small amounts to work properly. It is called an essential nutrient because your body cannot make it, so you must get it from food or supplements. Zinc plays a role in many body processes, including immune function, wound healing, cell growth, and your sense of taste and smell.

Zinc is found naturally in foods such as meat, shellfish (especially oysters), beans, nuts, seeds, dairy, and whole grains. It is also added to some breakfast cereals. As a supplement, zinc comes in many forms, including zinc gluconate, zinc acetate, zinc citrate, zinc picolinate, and zinc sulfate.

People take zinc supplements to prevent or treat deficiency, support the immune system, shorten colds, and help with skin conditions like acne. It is sold as tablets, capsules, lozenges, liquids, and topical products.

How it works

Zinc is a building block for hundreds of enzymes and proteins in your body. These enzymes help with many tasks, such as making DNA, growing new cells, healing wounds, and breaking down nutrients.

Zinc also helps immune cells develop and work normally, which is why deficiency can weaken the immune system. For colds, researchers think zinc may interfere with how certain cold viruses multiply in the throat and may reduce inflammation, though this is still being studied.

Because zinc is involved in so many basic processes, both too little and too much can throw the body off balance. Some of these mechanisms come from laboratory and early research, so the full picture is still being worked out.

Effectiveness

Does Zinc work?

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

Evidence overview · 123 uses evaluated

1 Effective 1 Likely effective 19 Possibly effective 14 Leans ineffective 88 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 Zinc deficiency