Career
During his military service and until 1952, he worked at the Institute of Pharmacology of the University of Cologne. After he returned to Belgium, he worked part time at the Ghent University Institute of Pharmacology and Therapeutics, headed by Corneille Heymans, who had won the Nobel Prize for medicine in 1938.[4]
With a loan of fifty thousand Belgian francs received from his father, Janssen founded his own research laboratory in 1953. That same year, he discovered ambucetamide, an antispasmodic found to be particularly effective for the relief of menstrual pain.[5]
In 1956, Janssen received his habilitation in pharmacology with pro venia legendi ("permission to lecture") designation for his thesis on Compounds of the R 79 type. He left the university and established what would become Janssen Pharmaceutica.[1]
On 11 February 1958, he developed haloperidol, a major breakthrough in the treatment of schizophrenia.[6] Working with his team, he developed the fentanyl family of drugs and a number of anesthetic agents, including droperidol and etomidate.[7][8] One of the anti-diarrheal drugs he developed, diphenoxylate (Lomotil), was used in the Apollo program.[9][10]
In 1959, Janssen synthesized the potent opioid fentanyl based on SAR studies of meperidine.[11] In the 1970s, he would improve upon the potency of fentanyl with the synthesis of Carfentanil.[12]
In 1985, Janssen Pharmaceutical became the first Western pharmaceutical company to establish a factory in China.[13] In 1995, together with Paul Lewi, he founded the Center for Molecular Design, where he and his team[14] used a supercomputer to search candidate molecules for potential AIDS treatments.[15][16]
Altogether Janssen and his cadre of scientists discovered more than eighty new medications, four of which are on the WHO list of essential medicines.
In 1991, he was elevated to the Belgian nobility by King Baudouin receiving the title of Baron.
