Telazol^® (TEL) (tiletamine hydrochloride and zolazepam hydrochloride combination) was used to immobilize 50 wild red howler monkeys (Alouatta seniculus) in Venezuela between October 1989 and February 1991. The mean (±SD) dosages of TEL used for adult males and adult females were 22.4 (±7.3) mg/kg and 22.5 (±5.0) mg/kg, respectively. Juveniles of both sexes received a mean dose of 30.5 (±5.6) mg/kg. The induction time for TEL ranged from 1 to 6.2 min. Thirteen animals were given an additional dosage of ketamine hydrochloride manually when they recovered from the first injection of TEL. Total recovery times ranged from 39 to 308 min. There were no apparent side effects to the fetuses of two pregnant females.