Dose response curves of salbutamol for bronchodilation and tachycardia are widely separated on dose axis. This information suggested that sulbutamol is: (A) Highly potent cardiac stimulant, (B) Highly efficacious bronchodilator, (C) Highly toxic drug, (D) Highly selective drug
Answer is D. Ref-Katzung 10/e p28,29 Wide Separation of two curves on DRC suggest that the dose required to produce one action is much higher than the other.