Interference of oral phenytoin absorption by continuous nasogastric feedings

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Abstract
Inhibition of phenytoin absorption by continuous nasogastric tube feeding was studied in 20 neurosurgery patients and 5 normal subjects. Ten patients receiving phenytoin suspension 300 mg per day coadministered with continuous nasogastric feedings had a mean phenytoin serum concentration of 2.59 μg per milliliter. When the feedings were discontinued, the average concentration rose to 10.22 μg per milliliter in 7 days. In 10 other patients stabilized on phenytoin suspension 300 mg per day, the average serum concentration decreased from 9.80 μg per milliliter to 2.72 μg per milliliter in 7 days when continuous tube feedings were started. Five normal subjects received a single oral dose of phenytoin suspension alone and while drinking a nasogastric tube feeding preparation orally at a rate of 100 ml per hour; phenytoin serum levels decreased an average of 71.6% when the tube feeding was taken concurrently.

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