Cimetidine does not alter free unchanged captopril pharmacokinetics and biological effects in healthy volunteer.

The effects of cimetidine (single or repeated administration) on free unchanged captopril plasma levels, pharmacokinetic parameters and plasma converting enzyme inhibitory effects have been investigated in normal healthy volunteers. Cimetidine affected neither captopril pharmacokinetic parameters nor its biological effects, suggesting that no change in captopril dosing is necessary when cimetidine is co-administered.