Gerhards was born in
Düren. He studied chemistry and medicine at the
University of Bonn. He earned a master's degree (Dipl. Chem.) in chemistry in 1954, passed the state exam in medicine in 1956 and earned a doctorate in medicine (Dr.med.) in the same year under the supervision of Wilhelm Dirscherl. He earned his second doctorate in chemistry (Dr.rer.nat.) in 1960 and his
Habilitation in
biochemistry at the
University of Marburg in 1967, with the dissertation
Stoffwechsel und Wirkungsmechanismus oraler Antidiabetica. Gerhards was an
assistant professor at the Institute of Physiological Chemistry at the University of Bonn from 1956 to 1960 and at the University of Marburg from 1960 to 1961. He joined
Schering AG in 1961 and was director of the departments for biological chemistry (1962–1970), animal experiments in pharmacodynamics and chemotherapy (1970–1980), and pharmaceutical chemistry and pharmacodynamics (from 1980). From 1972, he was also professor of biochemistry at the
Free University of Berlin. ==References==