Which of the following can reverse one or more smooth muscle effects of circulating histamine in humans?
Adrenaline is a physiological antagonist of histamine. It reverses bronchoconstriction caused by histamine. Ranitidine is an H2 antagonist that decreases gastric acid secretion but has no effect on smooth muscles.
Granisetron
Adrenaline
Ranitidine
Sumatriptan