The pharmacokinetic software package MW/Pharm offers an interactive, user-friendly program which gives rapid answers in clinical practice. It comprises a database with pharmacokinetic parameters of 180 drugs, a medication history database, and procedures for an individual drug dosage regimen calculation. The included curve-fitting facilities allow estimation of pharmacokinetic parameters on the basis of medication history, taking into account a varying status of the patient with respect to body weight and kidney function, optionally using a Bayesian procedure. The module KinBes performs the evaluation of bioavailability studies, including various methods, and an extensive statistical evaluation of bioequivalence.