Overview Evaluation of Diphenhydramine Hydrochloride Effects in Subjects With Occasional Sleeplessness Status: Completed Trial end date: 2014-12-01 Target enrollment: Participant gender: Summary The present study was conducted to investigate the impact of diphenhydramine hydrochloride on the ability to initiate sleep. Phase: Phase 4 Details Lead Sponsor: Procter and GambleTreatments: DiphenhydraminePromethazine