Dose-proportional absorption of etretinate after doses of 25, 50, 75, and 100 mg. 1987

R J Wills, and L C Rodriguez, and A H Lin, and C Puccini, and W A Colburn
Department of Drug Metabolism, Hoffmann-La Roche Inc., Nutley, New Jersey 07110.

Twelve healthy male subjects received single oral doses of etretinate, ranging from 25 to 100 mg (1 to 4 x 25-mg capsules) in an open-label, four-way randomized crossover design. Plasma concentrations of etretinate and two active metabolites were determined by a specific high-performance liquid chromatographic (HPLC) method. Analysis of variance and orthogonal contrasts were used to assess dose proportionality. Mean (+/- %CV) maximum concentrations after 25- to 100-mg doses were 133 (50), 195 (33), 261 (53), and 446 (65) ng/ml, whereas AUC0-12 values were 581 (46), 1090 (39), 1500 (52), and 2440 (63) ng.hr/ml, respectively. The test for proportionality indicated that Cmax and AUC0-12 increased proportionally with an increase in dose (P greater than 0.05).

UI MeSH Term Description Entries
D008297 Male Males
D004305 Dose-Response Relationship, Drug The relationship between the dose of an administered drug and the response of the organism to the drug. Dose Response Relationship, Drug,Dose-Response Relationships, Drug,Drug Dose-Response Relationship,Drug Dose-Response Relationships,Relationship, Drug Dose-Response,Relationships, Drug Dose-Response
D005050 Etretinate An oral retinoid used in the treatment of keratotic genodermatosis, lichen planus, and psoriasis. Beneficial effects have also been claimed in the prophylaxis of epithelial neoplasia. The compound may be teratogenic. B10-9359,Ethyl Etrinoate,Ro 10-9359,Ro-10-9359,Tigason,Tigazon,B10 9359,B109359,Etrinoate, Ethyl,Ro 10 9359,Ro 109359,Ro109359
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults

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