- Currently responding to L-Dopa therapy. On a stable dose of L-Dopa (or L-Dopa equivalent) of at least 300 mg total daily dose for at least 28 days prior to Day 1, in conjunction with a dopa decarboxylase inhibitor (e.g., L-Dopa/carbidopa or L-Dopa/benserazide) divided in at least 3 divided doses per day.