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Relative bioavailability of rectally administered carbamazepine suspension in humans

Relative bioavailability of rectally administered carbamazepine suspension in humans

Epilepsia 26(5): 429-433

The relative bioavailability of an investigational carbamazepine suspension was studied following rectal administration in human volunteers. Carbamazepine, in doses of approximately 6 mg/kg, was given to nine men. The routes of administration were oral tablet, oral suspension, and rectal suspension. There was no significant difference (p greater than 0.05) in total absorption, maximum serum concentration, and time to achieve maximum serum concentration between the orally-administered tablet and the rectally administered suspension. Orally administered suspension was absorbed more quickly and completely. All volunteers complained of a strong defecatory urge after the suspension was given rectally. The slow absorption after rectal administration precludes the use of this route in status epilepticus; however, it may be a satisfactory alternative for maintenance therapy when administration by the oral route is not possible.

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Accession: 006303604

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PMID: 4043011

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