<prompt> Shoest acting calcium channel blocker ?Verapami IAmlodipineNimodipincDiltiazam  <response>: Ans. is c i.e., Nimodipine Nimodipine is shoest acting CCB. -Katzung 1012 - 191 Nimodipine selectively relaxes cerebral vasculature - can be used in subarachnoid haemmorrhage or ruptured congenital intracranial aneurism. Amlodipine is longest acting CCB. Amlodipine has maximum oral bioavailabilitv. Nisoldipine has minimum oral bioavailability. 