Wiktionary
sympatholytic
a. (context medicine English) That opposes the stimulation of the sympathetic nervous system n. (context medicine English) Any medicine having this effect
Wikipedia
Sympatholytic
A sympatholytic (or sympathoplegic) drug is a medication which inhibits the postganglionic functioning of the sympathetic nervous system (SNS). They are indicated for various functions, for example they may be used as antihypertensives. They are also used to treat anxiety, such as Generalized Anxiety Disorder, Panic Disorder and PTSD.