The study includes 2 treatment periods. The open-label run-in period will begin at patient enrolment and continue for 3 weeks, during which all patients will receive once daily treatment with zicronapine. The double-blind period will begin at patient randomization and continue for 5 weeks, during which the patients will be assigned to one group receiving once daily treatment with zicronapine and 3 groups receiving once weekly treatment with zicronapine.
The main purpose of this study is to evaluate the safety, tolerability, and pharmacokinetics of once weekly dosing of zicronapine, compared to daily dosing of zicronapine.