MENLO PARK, Calif., Nov. 7, 2012 /PRNewswire/ -- Depomed, Inc. (Nasdaq: DEPO) today announced top line results from a Phase 2 clinical trial of DM-1992, Depomed's investigative novel gastric-retentive, extended-release formulation of carbidopa/levodopa, in patients with advanced Parkinson's disease with motor fluctuations. Phase 2 Study Design and ResultsThe trial was a randomized, active-controlled, open-label, crossover study evaluating DM-1992 dosed twice daily against a generic version of immediate-release carbidopa/levodopa (IR CD/LD) dosed as needed (mean daily dosing frequency = 4.8). 34 patients with advanced Parkinson's disease with motor fluctuations enrolled in the study at eight U.S. clinical centers. All enrolled patients completed the study. Baseline measurements were established over a three-day patient self-assessment period during which patients were maintained on existing Parkinson's medications. DM-1992 and IR CD/LD were each administered over a ten-day period that included a six-day dose optimization period, followed by a three-day patient self-assessment period and one in-clinic day for clinician evaluation and pharmacokinetic measurements. The primary endpoint for the study is change in percent "off" time during waking hours, as measured by patient self-assessment during the treatment period relative to the baseline period. Patients' mean baseline "off" time during waking hours was 5.4 hours per day (32.5%), compared to 4.5 hours (27.2%) during the DM-1992 self-assessment period and 5.5 hours (33.5%) for the IR CD/LD comparator. The reduction in percent "off" time reported during the DM-1992 patient self-assessment period relative to the IR CD/LD comparator was statistically significant (p = 0.047). Patients who experienced an "off" state for more than two hours were permitted to take IR CD/LD as rescue medication. Patients took 1.3 mean daily doses of rescue medication during the DM-1992 patient self-assessment period, compared to 0.2 mean daily doses for the IR CD/LD comparator. DM-1992 was generally well tolerated in the study. There were no serious adverse events.