Drug Interaction Report

Parathyroid Hormone Injection and Digoxin: Interaction Details

A pharmacist-reviewed analysis of the Parathyroid Hormone Injection and Digoxin interaction: the documented clinical effects, severity rating, onset, mechanism, and management considerations, with cited references throughout.

AI-assisted, pharmacist-reviewed · Source data updated Aug 9, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature

Parathyroid Hormone Injection

Natpara Natpara®
+

Digoxin

Cardoxin® Digitek Digitek® Digox Lanoxicaps® Lanoxin Lanoxin®
Dr. Brian Staiger, PharmD, BCPS
Medically reviewed by
Dr. Brian Staiger, PharmD, BCPS
Updated Aug 9, 2026
Editorial policy · Data sources
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Interaction severity
Major
Potentially serious — often needs a change or close monitoring.
How we grade severity & evidence

Severity levels

  • Contraindicated: These should generally not be used together.
  • Major: Potentially serious — often needs a change or close monitoring.
  • Moderate: Can be significant — usually manageable with monitoring.
  • Minor: Usually limited clinical impact.

Evidence grades

  • Established: Well documented — supported by controlled studies or strong clinical data.
  • Probable: Good supporting evidence, though not definitively proven.
  • Suspected: Some evidence suggests this interaction, but it is not well established.
  • Possible: Limited or conflicting evidence; the interaction may occur.
  • Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.

Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.

Worried about symptoms right now? Contact your pharmacist or prescriber, or call Poison Control at 1-800-222-1222 (US). Call 911 for an emergency.
Onset
unspecified
Evidence
theoretical
Severity
Major

What happens

Increased risk of digoxin toxicity and reduced digoxin exposure

Interaction Deep Dive

Concomitant use of digoxin with parathyroid hormone may cause digoxin toxicity if hypercalcemia occurs due to transient increases in calcium caused by parathyroid hormone. Monitor serum calcium and digoxin levels and check for signs and symptoms of digitalis toxicity. Dose adjustment of digoxin and parathyroid hormone may be required during concurrent use1 Concomitant use of digoxin and parathyroid hormone may also reduce digoxin exposure. Increase in the dose of digoxin may be required with concomitant use digoxin and parathyroid hormone 2345.

Why it happens (mechanism)

Hypercalcemia-induced alteration of digoxin inotropic effect; unknown

Common questions

Can I take Parathyroid Hormone Injection and Digoxin together?

Increased risk of digoxin toxicity and reduced digoxin exposure Always confirm with your pharmacist or prescriber before making any change.

How serious is the Parathyroid Hormone Injection and Digoxin interaction?

It is rated major. Potentially serious — often needs a change or close monitoring.

How quickly could this interaction happen?

The documented onset is "unspecified". The timing of this interaction is not well characterized.

How strong is the evidence for this interaction?

The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.

Questions for your pharmacist

  • Does my dose of Parathyroid Hormone Injection or Digoxin need adjusting while I take them together?
  • What symptoms should prompt me to call you or my prescriber right away?
  • Does the timing of my doses matter for this combination?
  • Is there a safer alternative to one of these medications for me?

References (5)

  1. Product Information: NATPARA(R) subcutaneous injection, parathyroid hormone subcutaneous injection. NPS Pharmaceuticals (per manufacturer), Bedminster, NJ, 2015.
  2. Product Information: LANOXIN(R) oral tablets, digoxin oral tablets. Concordia Pharmaceuticals Inc (per FDA), Kansas City, MO, 2019. DailyMed
  3. Product Information: DIGOXIN oral tablets, digoxin oral tablets. Aurobindo Pharma USA, Inc. (per Dailymed), East Windsor, NJ, May. DailyMed
  4. Product Information: LANOXIN® intravenous, intramuscular injection, digoxin intravenous, intramuscular injection. Covis Pharma (per FDA), King of Prussia, PA, 2025. DailyMed
  5. Product Information: DIGOXIN intravenous injection, digoxin intravenous injection. Hikma Pharmaceuticals USA Inc. (per Dailymed), Berkeley Heights, NJ, 2023. DailyMed
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Parathyroid Hormone Injection

Keep reading about Parathyroid Hormone Injection

All Parathyroid Hormone Injection interactions (2) Parathyroid Hormone Injection drug information
Also serious with: Alendronate
Digoxin

Keep reading about Digoxin

All Digoxin interactions (453) Digoxin drug information
Also serious with: Levoketoconazole Meclofenamate Mavorixafor Octreotide Injection
Beyond drug–drug

These medications also interact with supplements

Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:

Digoxin + Activated Charcoal Aloe Blue Flag Danshen European Buckthorn Foxglove Indian Snakeroot Lily-of-the-valley + 105 more

major · moderate · minor — check everything you take with our drug–supplement interaction checker.

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This information is for education, not a substitute for professional medical advice. Do not start, stop, or change any medication without talking to your pharmacist or prescriber.