Drug & supplement interaction

Vitamin D + Topotecan

Topotecan brand name: Hycamtin.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Vitamin D and Topotecan in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Vitamin D and Topotecan

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Topotecan and Vitamin D in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Vitamin D safety at a glance

Vitamin D overall Generally safe Vitamin D is generally safe at recommended doses, but very high doses over time can cause toxicity.
Pregnancy Likely Safe When used orally and appropriately. Vitamin D is safe when used in doses below the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily. Read the full pregnancy detail
Breastfeeding Likely Safe When used orally and appropriately. Vitamin D is safe when used in doses below the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily. Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Topotecan and Vitamin D? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Topotecan

Interactions in our licensed database are recorded against drug classes, not just single drug names. Topotecan is filed under 3 classifications — topoisomerase i inhibitors, topoisomerase ii inhibitors, oral drugs. Vitamin D has documented interactions with 8 drug classes — the most serious being aluminum (moderate), atorvastatin (lipitor) (moderate) and calcipotriene (dovonex) (moderate) — and none of Topotecan’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Vitamin D Does Interact With Other Medications

Vitamin D has 80 moderate, 635 minor known drug interactions in our database — Topotecan isn’t one of them. If you take anything else, check it against the full list below.

Moderate 80 Minor 635 No known interaction 2,115 (incl. Topotecan)
Taking anything else?

Check Another of Your Medications Against Vitamin D

Covers the 2,830 medications we’ve checked against Vitamin D. Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Vitamin D and Topotecan May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do. One of them is worth acting on rather than waiting out — marked below.

  • Anemia Worth acting on Additional detail

    Vitamin D

    “Orally or intramuscularly, vitamin D is well tolerated.

    Serious Adverse Effects (Rare):

    Orally or intramuscularly: Excessive doses can lead to vitamin D toxicity with symptoms of hypercalcemia, and also sometimes azotemia and anemia.”

    Vitamin D · Natural Medicines adverse-effect record, reported in anemia.

    Topotecan

    Listed in the ADVERSE REACTIONS section of the FDA label for Topotecan. Read the label on DailyMed ›

  • Vomiting Additional detail

    Vitamin D

    “Orally, vitamin D may cause dry mouth. In clinical research, intake of vitamin D 50,000 IU weekly for 4 weeks followed by 50,000 IU monthly for 5 months thereafter was associated with a 3.7-fold increase in reports of dry mouth compared with placebo.Vitamin D intoxication can occur when vitamin D supplements are taken orally in excessive doses. Symptoms of vitamin D toxicity include pancreatitis.”

    Vitamin D · Natural Medicines adverse-effect record, reported in dry mouth.

    4 sources cited
    1. 91348. Turner AN, Carr Reese P, Fields KS, Anderson J, Ervin M, Davis JA, Fichorova RN, Roberts MW, Klebanoff MA, Jackson RD. A blinded, randomized controlled trial of high-dose vitamin D supplementation to reduce recurrence of bacterial vaginosis. Am J Obstet G PubMed
    2. 10142. 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
    3. 84433. Carlton, S., Clopton, D., and Cappuzzo, K. A. Vitamin D deficiency: appropriate replenishment therapies and the effects of vitamin D toxicity. Consult Pharm 2010;25(3):171-177. PubMed
    4. 104624. Murai IH, Fernandes AL, Sales LP, et al. Effect of a single high dose of vitamin D3 on hospital length of stay in patients with moderate to severe COVID-19: A randomized clinical trial. JAMA. 2021.

    Topotecan

    Listed in the ADVERSE REACTIONS section of the FDA label for Topotecan. Read the label on DailyMed ›

Reported for Vitamin D but not commonly for Topotecan: a change in sex drive, kidney problems, kidney stones and pancreatitis.

Effects for Topotecan come from the ADVERSE REACTIONS section of its FDA label; effects for Vitamin D come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Vitamin D in Pregnancy & Breastfeeding

Pregnancy Likely Safe

When used orally and appropriately. Vitamin D is safe when used in doses below the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily.

Pregnancy Possibly Unsafe

When used orally in excessive amounts. Tell patients not to use doses above the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily. Hypercalcemia during pregnancy due to excessive vitamin D intake can lead to several fetal adverse effects, including suppression of parathyroid hormone, hypocalcemia, tetany, seizures, aortic valve stenosis, retinopathy, and mental and/or physical developmental delay.

Lactation Likely Safe

When used orally and appropriately. Vitamin D is safe when used in doses below the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily.

Lactation Possibly Unsafe

When used orally in excessive amounts. Tell patients not to use doses above the tolerable upper intake level (UL) of 4000 IU (100 mcg) daily.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

From our Q&A

Questions About Vitamin D or Topotecan

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Vitamin D or Topotecan, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Topotecan

This page covers Vitamin D only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Topotecan page lists 19 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Glucosamine (moderate).

By severity: 1 major · 9 moderate · 9 minor.

From our pharmacist’s overview on the Topotecan page

“Topotecan (Hycamtin) treats ovarian, cervical, and small cell lung cancers, and when a drug's entire job is killing tumor cells, anything that weakens it deserves genuine attention. Activated charcoal carries the only major rating among the 19 supplements flagged here.”

Reviewed by 2 · Jul 18, 2026

Open the Topotecan interaction page

One more smart check

Taking Vitamin D as Part of a Dietary Supplement Product? Check It for Interactions

We hold 26,930 real supplement products containing Vitamin D, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Vitamin D. Even though Vitamin D itself has no known interaction with Topotecan, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Vitamin D and Topotecan Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Vitamin D
Top 10

#5 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Topotecan
Steady interest

#1,755 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Vitamin D reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Vitamin D and Topotecan records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Vitamin D

What is Vitamin D?

Vitamin D
  • Bone health and osteoporosis
  • Correcting vitamin D deficiency
  • Immune system support
  • Muscle strength in older adults
  • General supplementation when sun exposure is low

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, especially those with low sun exposure, benefit from supplementation, but more is not always better and very high doses can be harmful. Ask your pharmacist or doctor whether a blood test and supplement make sense for you.

Not applicable (a vitamin, not a plant part) · Tablets, capsules, softgels, liquid drops, chewables, and injections

An interaction check asks whether these two react with each other — it does not ask whether Vitamin D is a good idea for someone in your situation. Here is what our Vitamin D record says about it on its own.

Vitamin D: dosing

The right dose of vitamin D depends on your age, blood level, health conditions, and how much sun and dietary vitamin D you get. There is no single dose that fits everyone.Supplements come in different strengths, and doses are measured in international units (IU) or micrograms (mcg). Some people only need a small daily amount, while those who are deficient may need a higher, supervised dose for a period of time.The best approach is to follow the directions on the product label or the advice of your pharmacist or doctor. A simple blood test can show whether you are low and help guide the right dose.

From our Vitamin D monograph — the full record covers uses, side effects and every documented interaction.

Read the full Vitamin D monograph & all interactions
Medication

About Topotecan

What Is Topotecan Used For?

Brand name: Hycamtin

Topotecan treats several serious cancers. The intravenous (IV) forms — sold under the brand names Hycamtin, Topotecan, and Topotecan Hydrochloride — are used for metastatic ovarian cancer that has progressed after prior chemotherapy, for small cell lung cancer (SCLC) that came back at least 60 days after first-line treatment, and for Stage IV-B, recurrent, or persistent cervical cancer (in combination with the chemotherapy drug cisplatin).

Hycamtin capsules (taken by mouth) are approved specifically for relapsed small cell lung cancer in patients who had at least a partial response to prior treatment and who are at least 45 days out from their first-line chemotherapy.

Most-Reported Side Effects for Topotecan

From FAERS, the FDA’s public side-effect reporting system (6,853 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Febrile neutropenia 602 reports
Anemia 576 reports
Neutropenia 557 reports
Nausea 459 reports
Disease progression 453 reports
See full Topotecan drug information
Keep checking

Other Drugs & Vitamin D

Browse every other medication we’ve checked against Vitamin D — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
80Moderate
635Minor
2,114No known interaction
80 Moderate 635 Minor 2,114 No interaction
Moderate

80 interactions

Showing 60 of 80 moderate interactions — see all 80 on the Vitamin D page.

Minor

635 interactions

Showing 60 of 635 minor interactions — see all 635 on the Vitamin D page.

No interaction 2,114 drugs checked — show the list

We also checked Vitamin D against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,114 medications checked with no known interaction — see the full Vitamin D list.

See the full Vitamin D interactions page
See every supplement checked against Topotecan, ranked by severity
Evidence & sources

Vitamin D References

The 26 references that drive our Vitamin D monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. Tatro DS, ed. Drug Interactions Facts. Facts and Comparisons Inc., St. Louis, MO. 1999.
  3. 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
  4. Bar-Or D, Yoel G. Calcium and calciferol antagonize effect of verapamil in atrial fibrillation. Br Med J 1981;282:1585-6.
  5. 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.
  6. Crowe M, Wollner L, Griffiths RA. Hypercalcemia following vitamin D and thiazide therapy in the elderly. Practitioner 1984;228:312-3.
  7. Parfitt AM. Thiazide-induced hypercalcemia in vitamin D-treated hypoparathyroidism. Ann Intern Med 1972;77:557-63. PubMed
  8. Thiazide diuretics and the risk of osteoporosis. Pharmacist's Letter/Prescriber's Letter 2003;19(11):191105.
  9. Moon J. The role of vitamin D in toxic metal absorption. J Am Coll Nutr 1994;13:559-64.
  10. 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.
  11. Adler AJ, Berlyne GM. Duodenal aluminum absorption in the rat: effect of vitamin D. Am J Physiol 1985;249:G209-13. PubMed
  12. Schwartz JB. Effects of vitamin D supplementation in atorvastatin-treated patients: A new drug interaction with an unexpected consequence. Clin Pharmacol Ther 2009;85:198-203. PubMed
  13. Dietary reference intakes for calcium and vitamin D. Institute of Medicine, November 30, 2010. Available at: http://www.iom.edu/~/media/Files/Report%20Files/2010/Dietary-Reference-Intakes-for-Calcium-and-Vitamin-D/Vitamin%20D%20and%20Calcium%202010%20Repo
  14. Cox KA, Dunn MA. Aluminum toxicity alters the regulation of calbindin-D28k protein and mRNA expression in chick intestine. J Nutr 2001;131:2007-13. PubMed
  15. Escribano, J., Balaguer, A., Pagone, F., Feliu, A., and Roque, I. Figuls. Pharmacological interventions for preventing complications in idiopathic hypercalciuria. Cochrane.Database.Syst.Rev. 2009;(1):CD004754. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Vitamin D and Topotecan Together: Common Questions

Is it safe to take Vitamin D with Topotecan?
We do not list a known interaction between Vitamin D and Topotecan. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Vitamin D and Topotecan have any of the same side effects?
Yes — our sources link each of them separately to 2 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
How was the Vitamin D and Topotecan combination checked?
Interactions in our licensed database are recorded against drug classes. Topotecan is filed under 3 classifications, and Vitamin D has documented interactions with 8 drug classes — none of Topotecan's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Vitamin D interact with any other medications?
Yes. Vitamin D has 715 documented drug interactions in our database — Topotecan is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Topotecan interact with any supplements?
Yes. Topotecan has documented interactions with 19 supplements in our database — Vitamin D is not one of them. The Topotecan interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Vitamin D monograph Uses, safety profile, and every drug interaction in one place Topotecan drug information The full plain-English guide to this medication Topotecan supplement interactions Every supplement checked against Topotecan, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 26 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.