Find information on medical topics, symptoms, drugs, procedures, news and more, written for the health care professional.

Comparison of dose-response curves.

Comparison of dose-response curves.
Comparison of dose-response curves.

Drug X has greater biologic activity per dosing equivalent and is thus more potent than drug Y or Z. Drugs X and Z have equal efficacy, indicated by their maximal attainable response (ceiling effect). Drug Y is more potent than drug Z, but its maximal efficacy is lower.