HMB (Calcium HMB) Ingredients & Drug Interactions
What is this page for?
First and foremost: checking HMB (Calcium HMB) against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
HMB (Calcium HMB) is a dietary supplement by BulkSupplements.com with 2 active ingredients. Its ingredients are commonly taken for bone health and osteoporosis prevention, dietary calcium deficiency, heartburn relief (calcium carbonate antacids).Based on those ingredients, 168 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Calcium. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against HMB (Calcium HMB) by BulkSupplements.com
Ask about any prescription or over-the-counter medication and we check it for interactions with HMB (Calcium HMB) by BulkSupplements.com — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of HMB (Calcium HMB) by BulkSupplements.com
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
This product contains 2 active ingredients: calcium and HMB (beta-hydroxy beta-methylbutyrate). Calcium is an essential mineral needed for bone strength, muscle function, heart rhythm, and nerve signaling.
HMB is a metabolite of the amino acid leucine that's been studied for its effects on muscle and recovery. There are no inactive ingredients listed for this formulation.
Does it work?
Insufficient evidence
Calcium is effective for several established uses: preventing and treating low blood calcium (hypocalcemia), managing high potassium levels (hyperkalemia), and treating upset stomach (dyspepsia). It's also likely effective for preventing and treating osteoporosis.
We don't have effectiveness data on file for HMB itself, so we can't tell you what the research shows for that ingredient in this product.
How safe is it?
Well-documented data
Calcium is generally well tolerated when you stick to recommended amounts, though high doses can cause problems. The most common side effects from oral calcium are belching, constipation, diarrhea, bloating, and stomach upset.
Rarely, very high doses have been linked to kidney stones and a serious skin condition called calciphylaxis. There's also some concern — not conclusive — that calcium intake above 1500–2000 mg daily might be tied to increased prostate cancer risk and possibly higher cardiovascular risk, though research on this is mixed and debated.
For pregnancy and breastfeeding, adequate calcium is important in both — staying within recommended amounts is considered likely safe in pregnancy and safe during breastfeeding. Talk with your doctor or midwife if you have questions about how much calcium you need during these times.
Meds to double-check
Major interaction found
Before you take this product, double-check it with your pharmacist if you're on any integrase inhibitors (dolutegravir, elvitegravir) or raltegravir for HIV, ceftriaxone (an antibiotic, especially if given intravenously), levothyroxine for thyroid disease, sotalol for heart rhythm, diltiazem for blood pressure or angina, or calcipotriene cream for psoriasis. These are the medication types with documented interactions with the calcium in this product.
The bottom line
Scorecard at a glanceFully disclosed formula with insufficient evidence for its stated purpose. Major medication interactions have been identified, and safety information is well characterized.
Calcium HMB is straightforward if you're not on HIV medications, antibiotics, thyroid replacement, or heart drugs — but if you are, this product needs careful timing or may not be right for you. The calcium here interacts with quite a few medications, some seriously.
Check your exact prescriptions with the tool on this page, and talk to your pharmacist before you start.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 22, 2024.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about HMB (Calcium HMB), straight from the product label.
| Brand | BulkSupplements.com |
|---|---|
| Barcode (UPC) | X000W5FISD |
| Net contents | 100 Gram(s); 3.5 Ounce(s) |
| Market status | On market |
| Date entered into DSLD | Aug 22, 2024 |
| DSLD ID | 312820 |
| Product type | Other Combinations |
| Supplement form | Powder |
| Dietary claims / uses | All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Dairy Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for HMB (Calcium HMB) by BulkSupplements.com, sourced from the NIH Dietary Supplement Label Database.
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Brand IP Statement(s)
BulkSupplements.com Clean & pure bulk supplements
FDA Disclaimer Statement
Warning: This product is not intended to diagnose, treat, cure, or prevent any disease.
Precautions
Always consult a physician before taking any dietary supplement.
Keep out of reach of children.
Formulation
Free of: Added sugar, soy, dairy, yeast, additives
Suggested/Recommended/Usage/Directions
Suggested use: As a dietary supplement, take 1000 mg (about 1/3 tsp) once or twice daily with water, or as directed by a physician.
Storage
Contents are sold by weight, not volume. Settling may occur. Store in a dry, cool place
General Statements
Use an accurate milligram scale. New
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
HMB (Calcium HMB) by BulkSupplements.com label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in HMB (Calcium HMB) by BulkSupplements.com
These are the 2 active ingredients this product is made of. Select any to open its full monograph.
Serving size1000 mg Dosage formPowder Servings per container100 Amounts shown are per serving.
Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.
Calcium
Interacts with168 drugs
Calcium is an essential mineral your body needs for strong bones, nerve signaling, and muscle function, and supplements can help fill gaps when diet f...
Calcium monograph & interactionsHMB
HMB (Calcium HMB) by BulkSupplements.com Drug Interactions
HelloPharmacist Interaction Report
Calcium HMB by BulkSupplements.com contains calcium, which does interact with a number of medications.
The most serious concern is with integrase inhibitors — antiretroviral drugs used for HIV. Calcium significantly reduces blood levels of dolutegravir (Tivicay) and elvitegravir (Vitekta), cutting their effectiveness.
If you take either of these, you'll need to space your doses carefully: take the HIV drug either 2 hours before or 6 hours after (for dolutegravir) or 2 hours after (for elvitegravir) your calcium supplement.
Read the full breakdown — every affected drug type, severity by severity
Calcium also has Major interactions with the antibiotic ceftriaxone (Rocephin). When ceftriaxone is given intravenously along with calcium — including calcium in IV fluids — it can form a dangerous precipitate in the lungs and kidneys.
IV calcium should be avoided within 48 hours of IV ceftriaxone.
There are Moderate interactions as well. Calcium can lower blood levels of raltegravir (Isentress), another HIV medication, though not enough to always require a dose change.
It also reduces how well your body absorbs levothyroxine (Synthroid) for thyroid disease, sotalol (Betapace) for heart rhythm, and diltiazem (Cardizem) for blood pressure and angina — spacing doses 2 to 4 hours apart helps. Additionally, taking calcipotriene (Dovonex), a vitamin D cream for psoriasis, together with calcium supplements might raise your calcium levels too high (hypercalcemia).
Altogether, these interactions span 167 individual medications. We could not check HMB itself for interactions — no data is on file for that ingredient.
Please use the medication checker below with your exact prescriptions before starting this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against HMB (Calcium HMB)?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in HMB (Calcium HMB) interact with 168 drugs. Click any drug to see the details.
1 of the 2 ingredients in HMB (Calcium HMB) interact with drugs. Each result below shows which ingredient is responsible. Calcium
Bendroflumethiazide, PotassiumCentyl K, Neo-NaClex-K
How Bendroflumethiazide, Potassium interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Bendroflumethiazide, Potassium interactionBendroflumethiazide, Rauwolfia SerpentinaRauzide
How Bendroflumethiazide, Rauwolfia Serpentina interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Bendroflumethiazide, Rauwolfia Serpentina interactionBenzthiazideExna
How Benzthiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Benzthiazide interactionBetamethasone Dipropionate, CalcipotrieneEnstilar, Wynzora
How Betamethasone Dipropionate, Calcipotriene interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumCalcipotriene (dovonex) Moderate
Interaction Summary
Taking calcipotriene with calcium might increase the risk for hypercalcemia.
Read the full Calcium + Betamethasone Dipropionate, Calcipotriene interactionBictegravir, Emtricitabine, Tenofovir AlafenamideBiktarvy
How Bictegravir, Emtricitabine, Tenofovir Alafenamide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumBictegravir/emtricitabine/tenofovir Alafenamide (biktarvy) Moderate
Interaction Summary
Calcium might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Read the full Calcium + Bictegravir, Emtricitabine, Tenofovir Alafenamide interactionBismuth Subsalicylate, Metronidazole, TetracyclineHelidac
How Bismuth Subsalicylate, Metronidazole, Tetracycline interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumTetracycline Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of tetracycline antibiotics.
Read the full Calcium + Bismuth Subsalicylate, Metronidazole, Tetracycline interactionBisoprolol, HydrochlorothiazideZiac
How Bisoprolol, Hydrochlorothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Bisoprolol, Hydrochlorothiazide interactionCalcipotrieneDovonex
How Calcipotriene interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumCalcipotriene (dovonex) Moderate
Interaction Summary
Taking calcipotriene with calcium might increase the risk for hypercalcemia.
Read the full Calcium + Calcipotriene interactionCandesartan Cilexetil, HydrochlorothiazideAtacand HCT
How Candesartan Cilexetil, Hydrochlorothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Candesartan Cilexetil, Hydrochlorothiazide interactionCaptopril, HydrochlorothiazideAcezide, Capozide
How Captopril, Hydrochlorothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Captopril, Hydrochlorothiazide interactionChlorothiazideDiuril
How Chlorothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Chlorothiazide interactionChlorothiazide, MethyldopaAldochlor, Aldoclor 150, Aldoclor 250
How Chlorothiazide, Methyldopa interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Chlorothiazide, Methyldopa interactionChlorothiazide, ReserpineDiupres
How Chlorothiazide, Reserpine interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Chlorothiazide, Reserpine interactionChlortetracyclineAureomycin
How Chlortetracycline interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumTetracycline Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of tetracycline antibiotics.
Read the full Calcium + Chlortetracycline interactionChlorthalidoneHygroton, Thalitone
How Chlorthalidone interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Chlorthalidone interactionChlorthalidone, ClonidineClorpres, Combipres
How Chlorthalidone, Clonidine interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Chlorthalidone, Clonidine interactionCinoxacinCinobac
How Cinoxacin interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumQuinolone Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of quinolone antibiotics.
Read the full Calcium + Cinoxacin interactionCiprofloxacinCiloxan, Cipro, Cipro IV, Cipro XR, Ciprobay, Otiprio
How Ciprofloxacin interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumQuinolone Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of quinolone antibiotics.
Read the full Calcium + Ciprofloxacin interactionClinafloxacinClinafloxacin
How Clinafloxacin interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumQuinolone Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of quinolone antibiotics.
Read the full Calcium + Clinafloxacin interactionCryptenamine, MethyclothiazideDiutensen
How Cryptenamine, Methyclothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Cryptenamine, Methyclothiazide interactionCyclothiazideAnhydron, Fluidil
How Cyclothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Cyclothiazide interactionDarunavir, Cobicistat, Emtricitabine, Tenofovir AlafenamideSymtuza
How Darunavir, Cobicistat, Emtricitabine, Tenofovir Alafenamide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumBictegravir/emtricitabine/tenofovir Alafenamide (biktarvy) Moderate
Interaction Summary
Calcium might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Read the full Calcium + Darunavir, Cobicistat, Emtricitabine, Tenofovir Alafenamide interactionDemeclocyclineDeclomycin
How Demeclocycline interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumTetracycline Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of tetracycline antibiotics.
Read the full Calcium + Demeclocycline interactionDeserpidine, HydrochlorothiazideOreticyl, Oreticyl Forte
How Deserpidine, Hydrochlorothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Deserpidine, Hydrochlorothiazide interactionDeserpidine, MethyclothiazideEnduronyl, Enduronyl Forte
How Deserpidine, Methyclothiazide interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumThiazide Diuretics Moderate
Interaction Summary
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Read the full Calcium + Deserpidine, Methyclothiazide interactionDigoxinDigitek, Lanoxicaps, Lanoxin
How Digoxin interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumDigoxin (lanoxin) Moderate
Interaction Summary
Using intravenous calcium with digoxin might increase the risk of fatal cardiac arrhythmias.
Read the full Calcium + Digoxin interactionDihydroxyaluminum Sodium CarbonateRolaids
How Dihydroxyaluminum Sodium Carbonate interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumAluminum Moderate
Interaction Summary
Calcium citrate might increase aluminum absorption and toxicity.
Read the full Calcium + Dihydroxyaluminum Sodium Carbonate interactionDiltiazemAdizem-SR, Adizem-XL, Angitil SR, Angitil XL, Calcicard CR, Cardizem +23 more
How Diltiazem interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumCalcium Channel Blockers, Diltiazem (cardizem, Others) Moderate
Interaction Summary
Intravenous calcium may decrease the effects of calcium channel blockers; oral calcium is unlikely to have this effect.
Read the full Calcium + Diltiazem interactionDiltiazem, EnalaprilTeczem
How Diltiazem, Enalapril interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumCalcium Channel Blockers, Diltiazem (cardizem, Others) Moderate
Interaction Summary
Intravenous calcium may decrease the effects of calcium channel blockers; oral calcium is unlikely to have this effect.
Read the full Calcium + Diltiazem, Enalapril interactionDoripenemDoribax
How Doripenem interacts with HMB (Calcium HMB) — through 1 ingredient. Tap an ingredient for the detail:
CalciumQuinolone Antibiotics, Tetracycline Antibiotics Moderate
Interaction Summary
Calcium seems to reduce the absorption of quinolone antibiotics.
Read the full Calcium + Doripenem interactionEach ingredient & the kinds of drugs it affects
For each ingredient in HMB (Calcium HMB) with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
Calcium
Ceftriaxone (Rocephin)
Co-administration of intravenous calcium and ceftriaxone can result in precipitation of a ceftriaxone-calcium salt in the lungs and kidneys.
Avoid administering intravenous calcium in any form, such as parenteral nutrition or Lactated Ringers, within 48 hours of intravenous ceftriaxone. Case reports in neonates show that administering intravenous ceftriaxone and calcium can result in precipitation of a ceftriaxone-calcium salt in the lungs and kidneys. In several cases, neonates have died as a result of this interaction. So far there are no reports in adults; however, there is still concern that this interaction might occur in adults.
Dolutegravir (Tivicay)
Calcium seems to reduce levels of dolutegravir.
Advise patients to take dolutegravir either 2 hours before or 6 hours after taking calcium supplements. Pharmacokinetic research suggests that taking calcium carbonate 1200 mg concomitantly with dolutegravir 50 mg reduces plasma levels of dolutegravir by almost 40%. Calcium appears to decrease levels of dolutegravir through chelation.
Elvitegravir (Vitekta)
Calcium seems to reduce levels of elvitegravir.
Advise patients to take elvitegravir either 2 hours before or 2 hours after taking calcium supplements. Pharmacokinetic research suggests that taking calcium along with elvitegravir can reduce blood levels of elvitegravir through chelation.
Aluminum
Calcium citrate might increase aluminum absorption and toxicity. Other types of calcium do not increase aluminum absorption.
Calcium citrate can increase the absorption of aluminum when taken with aluminum hydroxide. The increase in aluminum levels may become toxic, particularly in individuals with kidney disease. However, the effect of calcium citrate on aluminum absorption is due to the citrate anion rather than calcium cation. Calcium acetate does not appear to increase aluminum absorption.
Bictegravir/Emtricitabine/Tenofovir Alafenamide (Biktarvy)
Calcium might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Advise patients that bictegravir/emtricitabine/tenofovir alafenamide and calcium can be taken together if taken with food. However, if taken on an empty stomach, bictegravir/emtricitabine/tenofovir alafenamide should not be taken with, or 2 hours after, calcium containing products.
Bisphosphonates
Calcium reduces the absorption of bisphosphonates.
Advise patients to take bisphosphonates at least 30 minutes before calcium, but preferably at a different time of day. Calcium supplements decrease absorption of bisphosphonates.
Calcipotriene (Dovonex)
Taking calcipotriene with calcium might increase the risk for hypercalcemia.
Calcipotriene is a vitamin D analog used topically for psoriasis. It can be absorbed in sufficient amounts to cause systemic effects, including hypercalcemia. Theoretically, combining calcipotriene with calcium supplements might increase the risk of hypercalcemia.
Digoxin (Lanoxin)
Using intravenous calcium with digoxin might increase the risk of fatal cardiac arrhythmias.
Hypercalcemia increases the risk of fatal cardiac arrhythmias with digoxin. However, one retrospective analysis of clinical data suggests that intravenous calcium does not increase the risk of dysrhythmias or mortality in patients receiving digoxin.
Diltiazem (Cardizem, Others)
Theoretically, calcium may reduce the therapeutic effects of diltiazem.
Hypercalcemia can reduce the effectiveness of verapamil in atrial fibrillation. Theoretically, calcium might increase this risk of hypercalcemia and reduce the effectiveness of diltiazem.
Levothyroxine (Synthroid, Others)
Calcium seems to reduce the absorption and effectiveness of levothyroxine.
Advise patients to take levothyroxine and calcium supplements at least 4 hours apart. Calcium reduces levothyroxine absorption, probably by forming insoluble complexes. Calcium carbonate supplements reduce effectiveness of levothyroxine in patients with hypothyroidism.
Lithium
Theoretically, concomitant use of calcium and lithium may increase this risk of hypercalcemia.
Clinical research suggests that long-term use of lithium may cause hypercalcemia in 10% to 60% of patients. Theoretically, concomitant use of lithium and calcium supplements may further increase this risk.
Quinolone Antibiotics
Calcium seems to reduce the absorption of quinolone antibiotics.
Advise patients to take oral quinolones at least 2 hours before or 4-6 hours after calcium supplements or calcium-fortified foods. Taking calcium at the same time as oral quinolones can reduce quinolone absorption. Calcium binds to quinolones in the gut.
Raltegravir (Isentress)
Calcium may reduce levels of raltegravir.
Pharmacokinetic research shows that taking a single dose of calcium carbonate 3000 mg along with raltegravir 400 mg twice daily modestly decreases the mean area under the curve of raltegravir, but the decrease does not necessitate a dose adjustment of raltegravir. However, a case of elevated HIV-1 RNA levels and documented resistance to raltegravir has been reported for a patient taking calcium carbonate 1 gram three times daily plus vitamin D3 (cholecalciferol) 400 IU three times daily in combination with raltegravir 400 mg twice daily for 11 months. It is thought that calcium reduced raltegravir levels by chelation, leading to treatment failure.
Sotalol (Betapace)
Calcium seems to reduce the absorption of sotalol.
Advise patients to separate doses by at least 2 hours before or 4-6 hours after calcium. Calcium appears to reduce the absorption of sotalol, probably by forming insoluble complexes.
Tetracycline Antibiotics
Calcium seems to reduce the absorption of tetracycline antibiotics.
Advise patients to take oral tetracyclines at least 2 hours before, or 4-6 hours after calcium supplements. Taking calcium at the same time as oral tetracyclines can reduce tetracycline absorption. Calcium binds to tetracyclines in the gut.
Thiazide Diuretics
Taking calcium along with thiazides might increase the risk of hypercalcemia and renal failure.
Thiazides reduce calcium excretion by the kidneys. Using thiazides along with moderately large amounts of calcium carbonate increases the risk of milk-alkali syndrome (hypercalcemia, metabolic alkalosis, renal failure). Patients may need to have their serum calcium levels and/or parathyroid function monitored regularly.
Verapamil (Calan, Others)
Theoretically, calcium may reduce the therapeutic effects of verapamil.
Hypercalcemia can reduce the effectiveness of verapamil in atrial fibrillation. Theoretically, use of calcium supplements may increase this risk of hypercalcemia and reduce the effectiveness of verapamil.
Calcium Channel Blockers
Intravenous calcium may decrease the effects of calcium channel blockers; oral calcium is unlikely to have this effect.
Intravenous calcium is used to decrease the effects of calcium channel blockers in the management of overdose. Intravenous calcium gluconate has been used before intravenous verapamil (Isoptin) to prevent or reduce the hypotensive effects without affecting the antiarrhythmic effects. But there is no evidence that dietary or supplemental calcium when taken orally interacts with calcium channel blockers.
Brand information
Manufacturer and brand details for HMB (Calcium HMB), from the product label.
BulkSupplements.com
See all BulkSupplements.com products- Name
- BulkSupplements.com
- Street Address
- 7511 Eastgate Rd
- City
- Henderson
- State
- NV
- ZipCode
- 89011
- Web Address
- BulkSupplements.com
HMB (Calcium HMB) by BulkSupplements.com: Common Questions
Does HMB (Calcium HMB) by BulkSupplements.com interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Can I take this if I'm pregnant or breastfeeding?
What are the common side effects of calcium?
Is calcium effective for bone health?
What is HMB, and does it work?
Can very high doses of calcium cause problems?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if HMB (Calcium HMB) is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind HMB (Calcium HMB)’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
HMB (Calcium HMB)'s label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 62 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Calcium 62 references
- Shils M, Olson A, Shike M. Modern Nutrition in Health and Disease. 8th ed. Philadelphia, PA: Lea and Febiger, 1994.
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DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
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