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Drug Interactions between foscarnet and tiludronate

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

foscarnet tiludronate

Applies to: foscarnet and tiludronate

MONITOR: Coadministration with other drugs that can reduce serum calcium may potentiate the risk of hypocalcemia associated with foscarnet. Foscarnet chelates with divalent metal ions and causes a dose-related reduction in ionized serum calcium. Hypocalcemia may occur in 15% to 30% of treated patients. Severe hypocalcemia (Trousseau's and Chvostek's signs) and fatalities have been reported rarely in postmarketing surveillance during use of foscarnet in combination with intravenous pentamidine. The interaction has not been reported with other drugs.

MANAGEMENT: Close monitoring is recommended during concomitant use of foscarnet with other drugs that are known to affect calcium concentrations. Serum creatinine and electrolyte levels should be assessed prior to initiating therapy and frequently during therapy. Patients should be advised to promptly notify their physician if they experience potential symptoms of hypocalcemia such as perioral tingling, numbness in extremities, and paresthesias.

References (3)
  1. (1991) "Foscarnet: a review." Drugs, 41, p. 106-29
  2. (2001) "Product Information. Foscavir (foscarnet)." Astra-Zeneca Pharmaceuticals
  3. Youle M, Clarbour J, Gazzard B, Chanas A (1988) "Severe hypocalcemia in AIDS patients treated with foscarnet and pentamidine." Lancet, 1, p. 1455-6

Drug and food interactions

Moderate

tiludronate food

Applies to: tiludronate

ADJUST DOSING INTERVAL: Food significantly decreases the bioavailability of tiludronate. The manufacturer reports up to a 90% decrease in bioavailability when administered with or 2 hours after a standard breakfast. Clinical efficacy, however, was demonstrated when tiludronate was taken 2 hours before or after meals.

MANAGEMENT: Tiludronate should be administered with 6 to 8 ounces of plain water at least 2 hours before or 2 hours after food.

References (1)
  1. "Product Information. Skelid (tiludronate)." Sanofi Winthrop Pharmaceuticals

Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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