convulsant

 
Pronunciation: /kənˈvʌls(ə)nt/

adjective

  • (chiefly of drugs) producing sudden and involuntary muscle contractions.

noun

  • a convulsant drug.

Origin:

late 19th century: from French, from convulser, from Latin convuls- 'pulled violently, wrenched', from the verb convellere (see convulse)