Drug Interactions between crinecerfont and Phenytoin Sodium, Extended Release

Phenytoin levels may decrease when the suspension is given with enteral feedings. This could lead to a loss of seizure control. You could interrupt the feeding for 2 hours before and after the phenytoin dose. Alternatively, you may give the phenytoin suspension diluted in water and flush the tube with water after administration. These would make it easier for your body to absorb the medication. However, this still may not entirely avoid the interaction and may not always be feasible. You should have your phenytoin levels checked upon starting and stopping of enteral feedings. In addition, using phenytoin together with food may alter the effects of phenytoin. Contact your doctor if you experience worsening of seizure control or symptoms of toxicity, including twitching eye movements, slurred speech, loss of balance, tremor, muscle stiffness or weakness, nausea, vomiting, feeling light-headed, fainting, and slow or shallow breathing. If your doctor does prescribe these medications together, you may need a dose adjustment or special test to safely use both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Ask your doctor before making any changes to your therapy.

Consumer information for this interaction is not currently available.

ADJUST DOSING INTERVAL: Coadministration with food increases the oral bioavailability of crinecerfont. Administration of crinecerfont capsules and oral solution with a high-fat meal (800 to 1000 calories, 50% fat), increased crinecerfont peak plasma concentration (Cmax) by 4.9-fold and 8.6-fold, respectively, and systemic exposure (AUC) by 3.3-fold and 8.3-fold, respectively, compared to administration under fasting conditions.

MANAGEMENT: Crinecerfont should be administered twice daily with a meal in the morning and evening without regard to fat or calorie content.