papaverine: an alkaloid medicine (trade name Kavrin) obtained from opium; used to relax smooth muscles; it is nonaddictive
muscle relaxant: a drug that reduces muscle contractility by blocking the transmission of nerve impulses or by decreasing the excitability of the motor end plate or by other actions
ruminantia: cattle; bison; sheep; goats; antelopes; deer; chevrotains; giraffes; camels