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Articles

Food increases the bioavailability of isotretinoin

WA Colburn, DM Gibson, RE Wiens, and JJ Hanigan

Twenty healthy male subjects received 80 mg (2 X 40 mg SEG capsules) oral isotretinoin separated by two-week washout periods in an open randomized crossover design. Isotretinoin was administered during a complete fast, 1 hour after a standard breakfast, with a standard breakfast, or 1 hour before a standard breakfast. Blood samples were obtained at specific times over a 72-hour period. Isotretinoin blood concentrations were determined by a specific HPLC method. The relative bioavailability (AUC) of isotretinoin was found to be approximately 1.5 to 2 times greater when the dose was administered 1 hour before, concomitantly with, or 1 hour after a meal than when it was given during a complete fast. In addition, because the Cmax value is lower when the dose is administered with food rather than 1 hour after a meal, coadministration of isotretinoin with food may be the best method of administration.
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