Overview Efficacy and Safety of PT001 to Placebo and Open-label Spiriva® Respimat® in Subjects With Persistant Asthma Status: Completed Trial end date: 2019-09-12 Target enrollment: Participant gender: Summary Study Comparing the Efficacy and Safety of PT001 to Placebo and Open-label Spiriva® Respimat® in Subjects With Persistent Asthma Phase: Phase 2/Phase 3 Details Lead Sponsor: Pearl Therapeutics, Inc.Treatments: Tiotropium Bromide