A drug that shifts dose response curve to left has:
Ans. B. More potencyPosition of curve indicates potency and height of curve indicates efficacy. Left ward shift indicates increase in potency of the drug.Potency: amount of drug necessary to produce a given response.a. EC50 - The concentration of drug producing an effect that is 50 percent of the maximum is used to determine potency and is commonly designated as the EC50 . The smaller the EC50 , more is the potency of a drugb. Potency is given by position on DRC. The more leftward the curve, the more potent is drugEfficacy: maximum response produced by any dose of a druga. It is analogous to the maximal velocity (Vmax ) for a reactionb. In clinical setting, efficacy is more important than drug potencyc. Efficacy is given by height of DRC. Higher the curve, more efficacious is the drug
More efficacy
More potency
More safety
None
General Pharmacology