[How to determine the optimal dosage of a drug]. / Comment déterminer la posologie optimale d'un médicament.

Determining the optimal dosage is an important step in the development of any drug, as it will provide a basis to demonstrate the effectiveness of that drug at different dosage levels. This determination is mainly attempted in phase II, notably by means of dose-response studies, but it is obvious that data obtained at every stage in the life of the drug will provide a better approach to dosage recommendations. Several examples are discussed.