Vitamin D3 2000 IU Ingredients & Drug Interactions
by Schiff
What is this page for?
First and foremost: checking Vitamin 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
Vitamin D3 2000 IU is a dietary supplement by Schiff 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 D3. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Vitamin D3 2000 IU by Schiff
Ask about any prescription or over-the-counter medication and we check it for interactions with Vitamin D3 2000 IU by Schiff — 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 Vitamin D3 2000 IU by Schiff
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 one active ingredient: vitamin D3 (also called cholecalciferol), a form of vitamin D your body uses to absorb calcium, support bone health, and regulate immune function. Each tablet delivers 2,000 IU of vitamin D3.
The remaining ingredients—cellulose, dicalcium phosphate, modified corn starch, croscarmellose sodium, and magnesium stearate—are inactive fillers and binders that help form and stabilize the tablet.
Does it work?
Strong evidence
Vitamin D3 is effective for treating specific vitamin D deficiency diseases: rickets (soft bones in children), osteomalacia (soft bones in adults), renal osteodystrophy (bone disease from kidney failure), hypoparathyroidism (low parathyroid hormone), and familial hypophosphatemia (a genetic phosphate disorder). If you're taking this supplement for general bone health, immune support, or other wellness purposes not listed above, the evidence we hold does not establish effectiveness.
How safe is it?
Well-documented data
Vitamin D is generally well tolerated at recommended doses, but very high doses over time can cause toxicity with symptoms including high blood calcium (hypercalcemia), bone loss, kidney problems, and in children, slowed growth. Rare serious effects include inflammation of the eye (calcific conjunctivitis) and light sensitivity.
There is no pregnancy or breastfeeding safety data on file for this product; the safety notes indicate it is often used during pregnancy at recommended amounts but only under a doctor's guidance. If you're pregnant or breastfeeding, talk with your doctor or pharmacist before taking this supplement.
Meds to double-check
Moderate interaction found
Before taking Schiff Vitamin D3 2000 IU, check with your pharmacist if you take: heart rhythm medications like verapamil, diltiazem, or digoxin; thiazide diuretics; atorvastatin; calcipotriene; or aluminum-containing antacids. Additionally, vitamin D may reduce the effectiveness of many other medications metabolized by the liver enzyme CYP3A4—your pharmacist can review your full medication list.
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 appropriate for people with diagnosed vitamin D deficiency diseases under medical supervision. If you take heart rhythm medications, thiazide diuretics, atorvastatin, or calcipotriene, you should check with your pharmacist before starting—the interactions are real, especially at higher doses.
At 2,000 IU daily, you're still well below the tolerable upper limit (4,000 IU), which lowers risk but doesn't eliminate it.
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 Oct 22, 2016.
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 Vitamin D3 2000 IU, straight from the product label.
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 Vitamin D3 2000 IU by Schiff, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Vitamin D3 | 2000 IU | 500% |
Other ingredients: Cellulose, Dicalcium Phosphate, Modified Corn Starch, Croscarmellose Sodium, Magnesium Stearate
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.
General Statements
2000 IU Vitamin D3 daily is optimal for bone strength, muscle strength, immune function, heart health and anti-aging benefits. Vitamin D3 is the natural form of Vitamin D and more powerful than Vitamin D2.
GUARANTEED for purity, freshness and labeled potency.
Since 1936
New look
Supports bone Health Promotes overall health and wellness
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
Formulation
GUARANTEED: No added sugar (sucrose, fructose, lactose), salt (sodium chloride), yeast, wheat, gluten or milk. No preservatives, artificial colors or artificial flavors.
Seals/Symbols
Schiff Quality Guarantee
Over 75 years of wellness
Brand IP Statement(s)
Schiff SURE DISSOLVE tablets are formulated to disintegrate within one hour.
FDA Statement of Identity
Dietary Supplement
Suggested/Recommended/Usage/Directions
Directions: For best results, take one (1) tablet daily.
Precautions
NOTE: If you are pregnant, lactating or on prescribed medication, consult your physician before using.
Keep out of reach of children.
Storage
Store in a cool, dry place with lid tightly closed.
General
10133 46610133.5
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Vitamin D3 2000 IU by Schiff 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 Vitamin D3 2000 IU by Schiff
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Tablet(s) Dosage formTablet Or Pill Amounts shown are per serving.
Vitamin D3
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 D3 monograph & interactionsOther (inactive) ingredients: Cellulose, Dicalcium Phosphate, Modified Corn Starch, Croscarmellose Sodium, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.
Vitamin D3 2000 IU by Schiff Drug Interactions
HelloPharmacist Interaction Report
Schiff Vitamin D3 2000 IU contains a single active ingredient—vitamin D3—which does interact with several medications, particularly at higher doses.
The most serious concerns involve heart rhythm drugs: verapamil and diltiazem can lose effectiveness if vitamin D causes high blood calcium (hypercalcemia), and digoxin carries a risk of dangerous heart rhythm problems under the same condition.
Read the full breakdown — every affected drug type, severity by severity
Thiazide diuretics (water pills for blood pressure) also pose a Moderate risk; they reduce how much calcium your body excretes in urine, so taking them with vitamin D supplements could push calcium levels too high. Atorvastatin (a cholesterol medication) may see reduced absorption and blood levels when vitamin D is taken alongside it.
Calcipotriene, a vitamin D-like topical treatment for psoriasis, should not be combined with vitamin D supplements because of hypercalcemia risk. Aluminum-containing products (some antacids, for instance) might have increased absorption in people with kidney disease.
Vitamin D may also induce liver enzymes (CYP3A4) that break down many other medications, potentially lowering their effectiveness; this is listed as a Minor concern but affects a broad range of drugs.
No interactions are documented in our data for inactive ingredients in this product. Run your exact medications through the checker below before starting.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Vitamin 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 Vitamin D3 2000 IU interact with 715 drugs. Click any drug to see the details.
1 of the 1 ingredient in Vitamin D3 2000 IU interact with drugs. Each result below shows which ingredient is responsible. Vitamin D3
Hydrochlorothiazide, ReserpineHydropres, Serpasil-Esidrix, Serpasil-Esidrix #1, Serpasil-Esidrix #2
How Hydrochlorothiazide, Reserpine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydrochlorothiazide, Reserpine interactionHydrochlorothiazide, SpironolactoneAldactazide, Aldactide 25, Aldactide 50, Spirozine
How Hydrochlorothiazide, Spironolactone interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydrochlorothiazide, Spironolactone interactionHydrochlorothiazide, TimololTimolide
How Hydrochlorothiazide, Timolol interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydrochlorothiazide, Timolol interactionHydrochlorothiazide, TriamtereneDyazide, Maxzide, Maxzide-25, Triamzide, Triazide
How Hydrochlorothiazide, Triamterene interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydrochlorothiazide, Triamterene interactionHydrochlorothiazide, ValsartanDiovan HCT
How Hydrochlorothiazide, Valsartan interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydrochlorothiazide, Valsartan interactionHydroflumethiazideSaluron
How Hydroflumethiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydroflumethiazide interactionHydroflumethiazide, ReserpineSalutensin, Salutensin-Demi
How Hydroflumethiazide, Reserpine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Hydroflumethiazide, Reserpine interactionIndapamideLozide, Lozol
How Indapamide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Indapamide interactionIrbesartan, HydrochlorothiazideCoAprovel
How Irbesartan, Hydrochlorothiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Irbesartan, Hydrochlorothiazide interactionMethyclothiazideAquatensen, Enduron
How Methyclothiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Methyclothiazide interactionMethyclothiazide, PargylineEutron
How Methyclothiazide, Pargyline interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Methyclothiazide, Pargyline interactionMethyclothiazide, ReserpineDiutensen-R
How Methyclothiazide, Reserpine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Methyclothiazide, Reserpine interactionMetolazoneDiulo, Mykrox, Zaroxolyn
How Metolazone interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Metolazone interactionPolythiazideRenese
How Polythiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Polythiazide interactionPolythiazide, PrazosinMinizide
How Polythiazide, Prazosin interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Polythiazide, Prazosin interactionPolythiazide, ReserpineRenese R
How Polythiazide, Reserpine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Polythiazide, Reserpine interactionReserpine, TrichlormethiazideMetatensin #2, Metatensin #4, Naquival
How Reserpine, Trichlormethiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Reserpine, Trichlormethiazide interactionTrandolapril, VerapamilTarka
How Trandolapril, Verapamil interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome 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 D3 + Trandolapril, Verapamil interactionTrichlormethiazideAq 4B Aquazide, Marazide II, Metahydrin, Naqua
How Trichlormethiazide interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Thiazide Diuretics Moderate
Interaction Summary
Theoretically, taking thiazide diuretics and high-dose vitamin D can increase the risk of hypercalcemia.
Read the full Vitamin D3 + Trichlormethiazide interactionVerapamilCalan, Calan SR, Covera HS, Isoptin, Isoptin SR, Veramil +3 more
How Verapamil interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Verapamil (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 D3 + Verapamil interactionAdo-trastuzumab EmtansineKadcyla
How Ado-trastuzumab Emtansine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Ado-trastuzumab Emtansine interactionAbemaciclibVerzenio
How Abemaciclib interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Abemaciclib interactionAbiraterone
How Abiraterone interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Abiraterone interactionAbiraterone AcetateYonsa, Zytiga
How Abiraterone Acetate interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Abiraterone Acetate interactionAcalabrutinibCalquence
How Acalabrutinib interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Acalabrutinib interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, PhenylephrineHycomine Compound
How Acetaminophen, Caffeine, Chlorpheniramine, Hydrocodone, Phenylephrine interacts with Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + 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 Vitamin D3 2000 IU — through 1 ingredient. Tap an ingredient for the detail:
Vitamin D3Cytochrome P450 3a4 (cyp3a4) Substrates Minor
Interaction Summary
Vitamin D might induce CYP3A4 enzymes and reduce the bioavailability of CYP3A4 substrates.
Read the full Vitamin D3 + Acetaminophen, Caffeine, Codeine interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Vitamin 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 D3
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 Vitamin D3 2000 IU, from the product label.
Schiff
See all Schiff products- Name
- Schiff Nutrition Group, Inc.
- City
- Salt Lake City
- State
- UT
- ZipCode
- 84104
- Phone Number
- 1-800-526-6251
- Web Address
- www.schiffvitamins.com
Vitamin D3 2000 IU by Schiff: Common Questions
Does Vitamin D3 2000 IU by Schiff interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Can I take this vitamin D if I'm pregnant or breastfeeding?
What does vitamin D3 actually do in the body?
Can I take too much of this supplement?
Will this interact with my blood pressure or heart medication?
Is there anything else in this tablet I should know about?
Can this supplement lower my cholesterol medication's effectiveness?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Vitamin 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 Vitamin 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
Vitamin 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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