title: Oral tetracycline and retinoic acid gel in acne.
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy*; D000284:Administration, Oral; D000287:Administration, Topical; D000293:Adolescent; D000328:Adult; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D005260:Female; D005782:Gels; D006801:Humans; D008297:Male; D013752:Tetracycline / Q000008:administration & dosage* / Q000627:therapeutic use; D014212:Tretinoin / Q000008:administration & dosage* / Q000627:therapeutic use; D014801:Vitamin A / Q000031:analogs & derivatives*
chemical_list: D005782:Gels; D014801:Vitamin A; D014212:Tretinoin; D013752:Tetracycline