Herb & supplement monograph

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

But these pages have grown well beyond that into a full monograph — what Strontium 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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Strontium Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a serious Strontium drug interaction is low for most people, since the concerns are mostly about absorption rather than dangerous drug effects. None of the listed interactions are rated major; all are moderate, and most involve strontium and a medication blocking each other's absorption in the gut.

Interactions deserving the most attention

The best-documented issue is with antacids, which can noticeably reduce how much strontium the body absorbs, making the supplement less effective. Because strontium acts like calcium, it can also bind to quinolone and tetracycline antibiotics in the digestive tract and keep them from being absorbed, which matters because an antibiotic that is not absorbed may not clear an infection. These absorption effects are the interactions we would watch most closely.

What the rest of the list means

Many of the medications on the long list trace back to a few shared, mostly theoretical mechanisms. For example, hormone therapies such as androgens and estrogens might slow how the body clears strontium, but this comes from small studies and its real-world significance is unknown. A moderate rating here usually signals a manageable absorption issue, not a harmful combination.

Check your medications against Strontium

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

Interaction report

Drugs that interact with Strontium

101 medications have a known interaction with Strontium, 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 Strontium using our pharmacist-reviewed interaction data.

AI summaries are generated from our Strontium 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 Strontium 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 Strontium affects

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

All 5 drug categories Strontium interacts with

AndrogensAntacidsEstrogensQuinolone AntibioticsTetracycline Antibiotics

Androgens

Theoretically, androgens might reduce the excretion of strontium, potentially increasing its effects and adverse effects.
A small clinical study suggests that treatment with androgens such as testosterone, nandrolone, oxandrolone, and oxymetholone for 5-6 weeks might decrease urinary strontium excretion. The clinical significance of this interaction is unknown.

Likelihood Possible Evidence D

Antacids

Antacids can reduce the absorption of strontium, potentially decreasing its effectiveness.
Aluminum hydroxide and magnesium hydroxide can reduce absorption of strontium ranelate by 20% to 25%. Calcium can reduce its absorption to 60% to 70%. Avoid taking antacids within 2 hours of a dose of strontium ranelate. This interaction has also been reported with orally-administered radioactive strontium-85. It will likely also occur with other forms of strontium.

Likelihood Probable Evidence C

Estrogens

Theoretically, estrogens might reduce the excretion of strontium, potentially increasing its effects and adverse effects.
A small clinical study suggests that treatment with estrogens for 5-6 weeks might decrease urinary strontium excretion. The clinical significance of this interaction is unknown.

Likelihood Possible Evidence D

Quinolone Antibiotics

Theoretically, strontium might decrease the absorption of quinolone antibiotics.
Strontium is a divalent cation with similar properties to calcium. It is likely to form complexes with quinolones in the gastrointestinal (GI) tract, preventing absorption of the antibiotic. Recommend taking strontium supplements at least 2 hours before or after quinolones to avoid an interaction.

Likelihood Probable Evidence D

Tetracycline Antibiotics

Theoretically, strontium might decrease the absorption of tetracycline antibiotics.
Strontium is a divalent cation with similar properties to calcium. It is likely to form complexes with tetracyclines in the gastrointestinal (GI) tract, preventing absorption of the antibiotic. Recommend taking strontium supplements at least 2 hours before or after tetracyclines to avoid an interaction.

Likelihood Probable Evidence D

Monograph

Strontium: Uses, Safety & Side Effects

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

The bottom line

Strontium is a mineral that has been studied mainly for bone health and osteoporosis. The prescription form (strontium ranelate) showed benefit for fracture risk but carries serious heart-related safety concerns, while the over-the-counter supplement form (strontium citrate) has much less evidence. Talk to your doctor or pharmacist before using it, especially if you have heart disease or are at risk for blood clots.

Part used: Mineral element (not a plant)
Common forms: Capsules and tablets, usually as strontium citrate or strontium ranelate (prescription in some countries)

People commonly use it for

Bone health and osteoporosis
Reducing fracture risk
Tooth sensitivity (in some toothpastes)
Supporting bone density

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

Safety at a glance

OverallUse caution

Strontium has been linked to serious heart and clotting risks, especially the ranelate form.

PregnancyLikely Safe

When consumed orally in food amounts. Strontium has not been linked to toxicity when consumed in dietary amounts, which are typically about 0.5 mg to...

Read the full pregnancy detail

BreastfeedingLikely Safe

When consumed orally in food amounts. Strontium has not been linked to toxicity when consumed in dietary amounts, which are typically about 0.5 mg to...

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

Strontium is a naturally occurring mineral, similar in some ways to calcium. It is found in soil, rocks, water, and many foods in tiny amounts. It is not a plant or herb, but a chemical element.

The most studied medical form is strontium ranelate, which has been used as a prescription medicine in some countries to treat osteoporosis. A different form, strontium citrate, is sold as an over-the-counter dietary supplement, mainly for bone support. Strontium is also used in some special toothpastes to help with tooth sensitivity.

It is important not to confuse this everyday, non-radioactive strontium with radioactive forms of strontium (such as strontium-90), which are completely different and used in cancer treatment or found as nuclear waste.

How it works

Strontium is chemically similar to calcium, so the body handles it in a related way and it can be deposited into bone. In laboratory and animal studies, strontium appears to act on bone in two ways: it may help increase bone formation by bone-building cells (osteoblasts) and slow bone breakdown by bone-removing cells (osteoclasts).

Because strontium is heavier than calcium, it can also make bone density scans read higher, which does not always mean the bone is truly stronger. Many of these mechanisms come from lab research and may not fully explain results in people.

Effectiveness

Does Strontium work?

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

Evidence overview · 9 uses evaluated

2 Effective 1 Likely effective 2 Possibly effective 4 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 Dental hypersensitivity