Antispasmodics are medicines which possess the power of overcoming the
spasms of the muscles, or allaying any severe pain which is not
attended by inflammation. The class includes a great many, but the
most safe and serviceable are ammonia, assafoetida, galbanum,
valerian, bark, ether, camphor, opium, and chloroform; with the
minerals, oxide of zinc and calomel.