Antispasmodic

n. drug which reduces spasms or cramps

adj. reduces spasms

For spasmolytics acting on skeletal muscle, see muscle relaxant. An antispasmodic (synonym: spasmolytic) is a drug that suppresses smooth muscle contraction, especially in tubular organs. The effect is to prevent spasms of the stomach, intestine or bladder.
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Antispasmodic /an·ti·spas·mod·ic/ 1. preventing or relieving spasms. 2. an agent that so acts. an·ti·spas·mod·ic adj. [more]Antispasmodic - Community and Resources

Noun
1. a drug used to relieve or prevent spasms (especially of the smooth muscles)
(synonym) spasmolytic, antispasmodic agent
(hypernym) medicine, medication, medicament, medicinal drug
(hyponym) atropine

(n.)
A medicine which prevents or allays spasms or convulsions.
  

(a.)
Good against spasms.