High-Potency D3 2000 IU Ingredients & Drug Interactions
by Altrum
What is this page for?
First and foremost: checking High-Potency D3 2000 IU 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
High-Potency D3 2000 IU is a dietary supplement by Altrum with 1 active ingredient. Its ingredients are commonly taken for bone health and osteoporosis, correcting vitamin d deficiency, immune system support.Based on those ingredients, 715 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Vitamin D. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against High-Potency D3 2000 IU by Altrum
Ask about any prescription or over-the-counter medication and we check it for interactions with High-Potency D3 2000 IU by Altrum — 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 High-Potency D3 2000 IU by Altrum
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 is a single-ingredient supplement: vitamin D at 2000 IU per softgel. Vitamin D is a fat-soluble nutrient your body uses to absorb calcium, support bone health, and regulate immune and heart function.
The inactive ingredients are extra virgin olive oil, bovine gelatin, glycerin, water, and safflower oil — these are the capsule and carrier materials.
Does it work?
Strong evidence
Vitamin D at this dose is effective for treating specific medical conditions including rickets, osteomalacia (soft bones from vitamin D deficiency), familial hypophosphatemia, hypoparathyroidism, and renal osteodystrophy. This product's potency is lower than what's typically used for these conditions, so talk with your doctor about whether this dose is right for your needs.
How safe is it?
Well-documented data
Vitamin D is generally well tolerated at recommended doses. However, very high doses over time can cause vitamin D toxicity, with symptoms of high blood calcium (hypercalcemia), kidney problems, and anemia.
In rare cases, excessive vitamin D can also cause eye inflammation and light sensitivity. There isn't enough data on file about the safety of this product at higher-than-recommended amounts during pregnancy or breastfeeding — talk with your doctor or pharmacist for personalized advice if you're pregnant, planning pregnancy, or nursing.
Meds to double-check
Moderate interaction found
Double-check before you start if you take thiazide diuretics (used for high blood pressure), heart medications like verapamil, diltiazem, or digoxin, cholesterol-lowering drugs like atorvastatin, vitamin D-analog skin creams like calcipotriene, or medications that use the CYP3A4 enzyme system (which includes many drugs). Your pharmacist can tell you if any of your medications fall into these categories.
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
This product is designed for people whose doctors have prescribed vitamin D for specific bone or mineral disorders. If you take heart medications, diuretics, or cholesterol drugs, check with your pharmacist before starting — vitamin D can interact with several common medications.
Never exceed recommended doses without medical guidance, as excessive vitamin D can cause serious problems.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Jul 24, 2025.
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 High-Potency D3 2000 IU, straight from the product label.
| Brand | Altrum |
|---|---|
| Net contents | 120 Softgel(s) |
| Market status | On market |
| Date entered into DSLD | Jul 24, 2025 |
| DSLD ID | 331467 |
| Product type | Vitamin |
| Supplement form | Softgel Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Gluten Free, 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 High-Potency D3 2000 IU by Altrum, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Vitamin D | 50 mcg | 250% |
Other ingredients: Extra Virgin Olive Oil, Bovine Gelatin, Glycerin, Water, Safflower Oil
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.
Suggested/Recommended/Usage/Directions
Suggested Usage: Take 1 softgel daily with a meal.
Formula
Our Vitamin D-3 softgels supply this key vitamin in a highly absorbable liquid softgel form. Vitamin D is normally obtained from the diet or produced by the skin from the ultraviolet energy of the sun. However, it is not abundant in food. As more people avoid sun exposure, Vitamin D supplementation becomes even more necessary to ensure that your body receives an adequate supply.
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Precautions
Caution: For adults only.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Keep out of reach of children.
Produced in a GMP facility that processes other ingredients containing these allergens.
Formulation
Natural color variation may occur in this product. Supports immune system Structural support
GMP
Non-GMO Not manufactured with yeast, wheat, gluten, soy, corn, milk, egg, fish, shellfish or sesame ingredients.
FDA Statement of Identity
A Dietary Supplement
Storage
Store in a cool, dry place after opening.
General Statements
This bottle is made from 100% PCR (post-consumer recycled) resin.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
High-Potency D3 2000 IU by Altrum 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 High-Potency D3 2000 IU by Altrum
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Softgel(s) Dosage formSoftgel Capsule Servings per container120 Amounts shown are per serving.
Vitamin D
Interacts with715 drugs
Vitamin D is a fat-soluble vitamin that helps your body absorb calcium and is important for healthy bones, muscles, and immune function. Many people,...
Vitamin D monograph & interactionsOther (inactive) ingredients: Extra Virgin Olive Oil, Bovine Gelatin, Glycerin, Water, Safflower Oil. These complete the product’s ingredient list but are not active constituents.
High-Potency D3 2000 IU by Altrum Drug Interactions
HelloPharmacist Interaction Report
Altrum High-Potency D3 2000 IU contains vitamin D, which interacts with several medication types.
The most serious concern is with thiazide diuretics — these drugs decrease how much calcium your kidneys excrete, and when combined with vitamin D supplements, this can lead to high blood calcium levels (hypercalcemia), which can cause serious problems.
Read the full breakdown — every affected drug type, severity by severity
Vitamin D also interacts with heart medications. Verapamil and diltiazem (calcium channel blockers used for arrhythmias) can become less effective if high-dose vitamin D raises your blood calcium.
Digoxin, a heart medication, carries a theoretical but important risk: hypercalcemia from vitamin D can trigger dangerous heart rhythms. Calcipotriene, a vitamin D-like cream for psoriasis, shouldn't be combined with this supplement because of hypercalcemia risk.
Additionally, vitamin D may reduce how your body absorbs atorvastatin (a cholesterol medication), and it theoretically might increase absorption of aluminum (mainly a concern if you have kidney failure). There's also a minor concern with a broad enzyme system (CYP3A4) that metabolizes many drugs — vitamin D might affect how quickly your body processes these medications.
Altogether, these interactions span 705 individual medications. Use the checker below to look up any medications you're taking before starting this product.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against High-Potency D3 2000 IU?
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 High-Potency D3 2000 IU interact with 715 drugs. Click any drug to see the details.
1 of the 1 ingredient in High-Potency D3 2000 IU interact with drugs. Each result below shows which ingredient is responsible. Vitamin D
Hydrochlorothiazide, ReserpineHydropres, Serpasil-Esidrix, Serpasil-Esidrix #1, Serpasil-Esidrix #2
How Hydrochlorothiazide, Reserpine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydrochlorothiazide, Reserpine interactionHydrochlorothiazide, SpironolactoneAldactazide, Aldactide 25, Aldactide 50, Spirozine
How Hydrochlorothiazide, Spironolactone interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydrochlorothiazide, Spironolactone interactionHydrochlorothiazide, TimololTimolide
How Hydrochlorothiazide, Timolol interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydrochlorothiazide, Timolol interactionHydrochlorothiazide, TriamtereneDyazide, Maxzide, Maxzide-25, Triamzide, Triazide
How Hydrochlorothiazide, Triamterene interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydrochlorothiazide, Triamterene interactionHydrochlorothiazide, ValsartanDiovan HCT
How Hydrochlorothiazide, Valsartan interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydrochlorothiazide, Valsartan interactionHydroflumethiazideSaluron
How Hydroflumethiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydroflumethiazide interactionHydroflumethiazide, ReserpineSalutensin, Salutensin-Demi
How Hydroflumethiazide, Reserpine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Hydroflumethiazide, Reserpine interactionIndapamideLozide, Lozol
How Indapamide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Indapamide interactionIrbesartan, HydrochlorothiazideCoAprovel
How Irbesartan, Hydrochlorothiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Irbesartan, Hydrochlorothiazide interactionMethyclothiazideAquatensen, Enduron
How Methyclothiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Methyclothiazide interactionMethyclothiazide, PargylineEutron
How Methyclothiazide, Pargyline interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Methyclothiazide, Pargyline interactionMethyclothiazide, ReserpineDiutensen-R
How Methyclothiazide, Reserpine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Methyclothiazide, Reserpine interactionMetolazoneDiulo, Mykrox, Zaroxolyn
How Metolazone interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Metolazone interactionPolythiazideRenese
How Polythiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Polythiazide interactionPolythiazide, PrazosinMinizide
How Polythiazide, Prazosin interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Polythiazide, Prazosin interactionPolythiazide, ReserpineRenese R
How Polythiazide, Reserpine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Polythiazide, Reserpine interactionReserpine, TrichlormethiazideMetatensin #2, Metatensin #4, Naquival
How Reserpine, Trichlormethiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Reserpine, Trichlormethiazide interactionTrandolapril, VerapamilTarka
How Trandolapril, Verapamil interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates, Verapamil (calan, Others) Moderate
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Trandolapril, Verapamil interactionTrichlormethiazideAq 4B Aquazide, Marazide II, Metahydrin, Naqua
How Trichlormethiazide interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DThiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D + Trichlormethiazide interactionVerapamilCalan, Calan SR, Covera HS, Isoptin, Isoptin SR, Veramil +3 more
How Verapamil interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DVerapamil (calan, Others), Cytochrome P450 3a4 (cyp3a4) Substrates Moderate
Interaction Summary
Hypercalcemia induced by high-dose vitamin D can reduce the therapeutic effects of verapamil for arrhythmia.
Read the full Vitamin D + Verapamil interactionAdo-trastuzumab EmtansineKadcyla
How Ado-trastuzumab Emtansine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Ado-trastuzumab Emtansine interactionAbemaciclibVerzenio
How Abemaciclib interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Abemaciclib interactionAbiraterone
How Abiraterone interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Abiraterone interactionAbiraterone AcetateYonsa, Zytiga
How Abiraterone Acetate interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Abiraterone Acetate interactionAcalabrutinibCalquence
How Acalabrutinib interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acalabrutinib interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, PhenylephrineHycomine Compound
How Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interactionAcetaminophen, Caffeine, CodeineGesic C15, Gesic C30, Gesic C8, Lenoltec 1, Lenoltec 2, Lenoltec 3 +1 more
How Acetaminophen, Caffeine, Codeine interacts with High-Potency D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin DCytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D + Acetaminophen, Caffeine, Codeine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in High-Potency D3 2000 IU 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.
Vitamin D
Aluminum
Vitamin D might increase aluminum absorption and toxicity, but this has only been reported in people with renal failure.
The protein that transports calcium across the intestinal wall can also bind and transport aluminum. This protein is stimulated by vitamin D, which may therefore increase aluminum absorption. This mechanism may contribute to increased aluminum levels and toxicity in people with renal failure, when they take vitamin D and aluminum-containing phosphate binders chronically.
Atorvastatin (Lipitor)
Vitamin D might reduce absorption of atorvastatin.
A small, low-quality clinical study shows that taking vitamin D reduces levels of atorvastatin and its active metabolites by up to 55%. However, while atorvastatin levels decreased, total cholesterol, low-density lipoprotein (LDL) cholesterol, and high-density lipoprotein (HDL) cholesterol levels did not substantially change. Atorvastatin is metabolized in the gut by CYP3A4 enzymes, and researchers theorized that vitamin D might induce CYP3A4, causing reduced levels of atorvastatin. However, this proposed mechanism was not specifically studied.
Calcipotriene (Dovonex)
Taking calcipotriene with vitamin D increases 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 vitamin D supplements might increase the risk of hypercalcemia.
Digoxin (Lanoxin)
Theoretically, hypercalcemia induced by high-dose vitamin D can increase the risk of arrhythmia from digoxin.
High doses of vitamin D can cause hypercalcemia. Hypercalcemia increases the risk of fatal cardiac arrhythmias with digoxin. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and digoxin concurrently.
Diltiazem (Cardizem, Others)
Theoretically, hypercalcemia induced by high-dose vitamin D can reduce the therapeutic effects of diltiazem for arrhythmia.
High doses of vitamin D can cause hypercalcemia. Hypercalcemia can reduce the effectiveness of verapamil in atrial fibrillation. Theoretically this could also occur with diltiazem. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and diltiazem concurrently.
Thiazide Diuretics
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Thiazide diuretics decrease urinary calcium excretion, which could lead to hypercalcemia if vitamin D supplements are taken concurrently. This has been reported in people being treated with vitamin D for hypoparathyroidism, and also in elderly people with normal parathyroid function who were taking a thiazide, vitamin D, and calcium-containing antacids daily.
Verapamil (Calan, Others)
Hypercalcemia induced by high-dose vitamin D can reduce the therapeutic effects of verapamil for arrhythmia.
Hypercalcemia due to high doses of vitamin D can reduce the effectiveness of verapamil in atrial fibrillation. Avoid vitamin D doses above the tolerable upper intake level (4000 IU daily for adults) and monitor serum calcium levels in people taking vitamin D and verapamil concurrently.
Cytochrome P450 3A4 (Cyp3A4) Substrates
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
There is some concern that vitamin D might induce CYP3A4. In vitro research suggests that vitamin D induces CYP3A4 transcription. Additionally, observational research has found that increased UV light exposure and serum vitamin D levels are associated with decreased serum levels of CYP3A4 substrates such as tacrolimus and sirolimus, while no association between UV light exposure or vitamin D levels and levels of mycophenolic acid, a non-CYP3A4 substrate, was found. A small, low-quality clinical study shows that taking vitamin D reduces levels of the CYP3A4 substrate atorvastatin and its active metabolites by up to 55%; however, the clinical effects of atorvastatin were not reduced. While researchers theorized that vitamin D might induce CYP3A4, this proposed mechanism was not specifically studied.
Brand information
Manufacturer and brand details for High-Potency D3 2000 IU, from the product label.
Altrum
See all Altrum products- Name
- ALTRUM Nutrition Div. of AMSOIL INC.
- City
- Superior
- State
- WI
- ZipCode
- 54880
- Phone Number
- (715) 392-7101
High-Potency D3 2000 IU by Altrum: Common Questions
Does High-Potency D3 2000 IU by Altrum interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Is 2000 IU a high dose of vitamin D?
Can I take this if I'm pregnant?
What does this supplement actually do?
What are the side effects?
Can I take too much of this?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if High-Potency D3 2000 IU 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 High-Potency D3 2000 IU’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
High-Potency D3 2000 IU'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 26 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.
Vitamin D 26 references
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
- Tatro DS, ed. Drug Interactions Facts. Facts and Comparisons Inc., St. Louis, MO. 1999.
- Koutkia P, Chen TC, Holick MF. Vitamin D intoxication associated with an over-the-counter supplement. N Engl J Med 2001;345:66-7. PubMed
- Bar-Or D, Yoel G. Calcium and calciferol antagonize effect of verapamil in atrial fibrillation. Br Med J 1981;282:1585-6.
- Demontis R, Leflon A, Fournier A, et al. 1 alpha(OH) vitamin D3 increases plasma aluminum in hemodialyzed patients taking AI(OH)3. Clin Nephrol 1986;26:146-9.
- Crowe M, Wollner L, Griffiths RA. Hypercalcemia following vitamin D and thiazide therapy in the elderly. Practitioner 1984;228:312-3.
- Parfitt AM. Thiazide-induced hypercalcemia in vitamin D-treated hypoparathyroidism. Ann Intern Med 1972;77:557-63. PubMed
- Thiazide diuretics and the risk of osteoporosis. Pharmacist's Letter/Prescriber's Letter 2003;19(11):191105.
- Moon J. The role of vitamin D in toxic metal absorption. J Am Coll Nutr 1994;13:559-64.
- Demontis R, Reissi D, Noel C, et al. Indirect clinical evidence that 1alphaOH vitamin D<SUB>3</SUB> increases the intestinal absorption of aluminum. Clin Nephrol 1989;31:123-7.
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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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