Overview To Determine if Diphenhydramine Works for Nasal Congestion at Two Different Doses Status: Completed Trial end date: 2007-05-01 Target enrollment: Participant gender: Summary The study was to determine if the drug worked to relieve nasal congestion experienced by people with seasonal allergies. Phase: Phase 4 Details Lead Sponsor: Johnson & Johnson Consumer and Personal Products WorldwideTreatments: DiphenhydramineEphedrinePromethazinePseudoephedrine