About us Contacts Drug interactions: 390 212
Drug search by name

Felbamate Tablets and Phenytoin Sodium

Determining the interaction of Felbamate Tablets and Phenytoin Sodium and the possibility of their joint administration.

Check result:
Felbamate Tablets <> Phenytoin Sodium
Relevance: 07.06.2022 Reviewer: Shkutko P.M., M.D., in

In the database of official manuals used in the service creation an interaction registered by statistical results of studies was found, which can either lead to negative consequences for the patient health or strengthen a mutual positive effect. A doctor should be consulted to address the issue of joint drug administration.

Consumer:

Using phenytoin together with felbamate may alter the effects of both medications. Contact your doctor if you experience a worsening of seizure control or signs of phenytoin toxicity, including drowsiness, visual disturbances, change in mental status, seizures, nausea, or loss of muscle coordination. 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. Do not stop using any medications without first talking to your doctor.

Professional:

ADJUST DOSE: Felbamate may increase steady-state plasma concentrations of phenytoin by decreasing its plasma clearance. Also, phenytoin may increase (and may nearly double) the plasma clearance of felbamate. Other hydantoins may interact with felbamate in a similar manner.

MANAGEMENT: When combination therapy is started, felbamate should be initiated at 1200 mg per day in 3 to 4 divided doses while reducing the phenytoin dose by 20% to 40%. In general, the felbamate dose may be titrated more quickly than when felbamate is given as monotherapy. Close observation for clinical and laboratory evidence of altered effects is indicated. Patients should be advised to notify their physician if they experience symptoms of toxicity, including drowsiness, visual disturbances, change in mental status, seizures, nausea, or ataxia.

References
  • Fuerst RH, Graves NM, Leppik IE, Brundage RC, Holmes GB, Remmel RP "Felbamate increases phenytoin but decreases carbamazepine concentrations." Epilepsia 29 (1988): 488-91
  • Wagner ML, Graves NM, Marienau K, Holmes GB, Remmel RP, Leppik IE "Discontinuation of phenytoin and carbamazepine in patients receiving felbamate." Epilepsia 32 (1991): 398-406
  • Graves NM, Holmes GB, Fuerst RH, Leppik IE "Effect of felbamate on phenytoin and carbamazepine serum concentrations." Epilepsia 30 (1989): 225-9
  • "Product Information. Felbatol (felbamate)." Wallace Laboratories, Cranbury, NJ.
Felbamate Tablets

Generic Name: felbamate

Brand name: Felbatol

Synonyms: Felbamate

Phenytoin Sodium

Generic Name: phenytoin

Brand name: Dilantin, Dilantin Infatabs, Phenytek, Phenytoin Sodium, Prompt

Synonyms: n.a.

In the course of checking the drug compatibility and interactions, data from the following reference sources was used: Drugs.com, Rxlist.com, Webmd.com, Medscape.com.

Interaction with food and lifestyle
Disease interaction