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Drug Interactions between fosphenytoin and troleandomycin

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

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Interactions between your drugs

Moderate

troleandomycin fosphenytoin

Applies to: troleandomycin and fosphenytoin

MONITOR: Coadministration with phenytoin may reduce the plasma concentrations and antimicrobial efficacy of erythromycin and other macrolide antibiotics. The mechanism is induction of CYP450 3A metabolism by phenytoin. Additionally, plasma concentrations of phenytoin may be increased. One study has suggested that the pharmacokinetic disposition of phenytoin is not significantly altered in patients receiving erythromycin. However, occasional large changes in phenytoin clearance were noted in some patients.

MANAGEMENT: If concomitant use is medically necessary, caution and monitoring for altered efficacy and safety of both medications is recommended.

References (5)
  1. Bachmann K, Schwartz JI, Forney RB Jr, Jauregui L (1984) "Single dose phenytoin clearance during erythromycin treatment." Res Commun Chem Pathol Pharmacol, 46, p. 207-17
  2. Milne RW, Coulthard K, Nation RL, et al. (1988) "Lack of effect of erythromycin on the pharmacokinetics of single oral doses of phenytoin." Br J Clin Pharmacol, 26, p. 330-3
  3. Cerner Multum, Inc. "UK Summary of Product Characteristics."
  4. Canadian Pharmacists Association (2006) e-CPS. http://www.pharmacists.ca/function/Subscriptions/ecps.cfm?link=eCPS_quikLink
  5. Cerner Multum, Inc. "Australian Product Information."

Drug and food interactions

No alcohol/food interactions were found. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

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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