Drug Interaction Report
1 potential interaction and/or warning found for the following 2 drugs:
- fosaprepitant
- fosphenytoin
Interactions between your drugs
fosphenytoin fosaprepitant
Applies to: fosphenytoin, fosaprepitant
MONITOR: Theoretically, coadministration of phenytoin and aprepitant may result in decreased plasma concentrations of both drugs. The mechanism is phenytoin induction of CYP450 3A4, of which aprepitant is a substrate, and aprepitant induction of CYP450 2C9, of which phenytoin is a substrate.
MANAGEMENT: During coadministration of aprepitant and phenytoin, the possibility of a diminished therapeutic response to both drugs should be considered. Pharmacologic response should be monitored more closely whenever one or the other drug is added to or withdrawn from therapy, and the dosage(s) adjusted as necessary.
References (2)
- (2003) "Product Information. Emend (aprepitant)." Merck & Co., Inc
- (2008) "Product Information. Emend for Injection (fosaprepitant)." Merck & Co., Inc
Drug and food/lifestyle interactions
No alcohol/food interactions were found with the drugs in your list. However, this does not necessarily mean no food interactions exist. Always consult your healthcare provider.
Therapeutic duplication warnings
No duplication 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
| Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. | |
| Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. | |
| 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. | |
| No interaction information available. |
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Further information
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