<chemical> A phenothiazine derivative that is effective as an antipruritic. ... Pharmacological action: antipruritics. ... Chemical name: 10H-Phenothiazine-10-propanamine, N,N,beta-trimethyl- ... (12 Dec 1998) ... 
(tri-mep´rә-zēn) a phenothiazine derivative with powerful antihistaminic action; used as the tartrate salt to relieve itching.