Abstract
Blood and tissue haloperidol concentrations can be altered by the concurrent administration of a number of other drugs. Here we describe effects of concurrent administration of the vitamin A metabolite, isotretinoin, on haloperidol and reduced haloperidol concentrations in the rat. Isotretinoin increased the concentrations of both haloperidol and reduced haloperidol in serum, red blood cells, and brain. However, the dose dependence and degree of the effect varied significantly across tissues. Further study is called for to elucidate the interaction of neuroleptics such as haloperidol with the vitamin A acids such as isotretinoin.
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