Difference between rantidine & cimetidine is -

Ans. is 'a' i.e., Ranitidine is 5 times more potent than cimetidine o Ranitidine has several desirable features compared to cimetidine:5 times more potent than cimetidine.No antiandrogenic action, does not increase prolactin secretion or spare estradiol from hepatic metabolism - no effect on male sexual function or gynaecomastia.Lesser permeability into brain.Less marked inhibition of hepatic metabolism of other drugs.Overall incidence of side - effects is lower.