short-acting

adjective

(of a drug) quickly effective, but requiring regularly repeated doses for long-term treatment, being rapidly absorbed, distributed in the body, and excretedCompare intermediate-acting, long-acting

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012