Am J Health-Syst Pharm
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American Journal of Hospital Pharmacy, Vol 47, Issue 9, 2034-2037
Copyright © 1990 by American Society of Health-System Pharmacists

Articles

Loss of carbamazepine suspension through nasogastric feeding tubes

AL Clark-Schmidt, WR Garnett, DR Lowe, and HT Karnes


The apparent loss of carbamazepine suspension during administration through polyvinyl chloride nasogastric feeding tubes in vitro was studied. Twelve methods of administering carbamazepine suspension (100 mg/5 mL) were tested; the methods differed with respect to nasogastric tube size, presence and type of diluent, and type of flush solution. Undiluted or 50% diluted carbamazepine suspension 200 mg was drawn up in a syringe and forced through adult or pediatric nasogastric feeding tubes. The tubes were immediately flushed twice with 50 mL of sterile water, 0.9% sodium chloride solution, or 5% dextrose solution, by using the same syringe used to administer the suspension. Samples were collected and analyzed for carbamazepine concentration by high-performance liquid chromatography. Each administration method was tested six times, and the results were subjected to analysis of variance. Significant loss of carbamazepine was noted for four of the six methods in which undiluted suspension was administered. In these methods, adult and pediatric tubes were flushed with sterile water or 0.9% sodium chloride. No significant loss of drug occurred for any of the methods involving the use of diluent. Significant losses were associated with diluent and flush solution but not nasogastric tube size. Carbamazepine suspension should be mixed with an equal volume of diluent before being administered through nasogastric feeding tubes.
 



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