"Extended" (Alternate Day) Antipsychotic Dosing

The study wishes to examine whether "extended" antipsychotic treatment, in this case, antipsychotic treatment every other day, is as effective as daily treatment. It is also evaluating whether there may be differences in terms of side effects. Participants will be randomly assigned to either the treatment as usual group (i.e., taking antipsychotic daily) or the extended dosing group (i.e., taking antipsychotic one day on, one day off). That means, like flipping a coin, there is a 50/50 chance that participants will continue on daily dosing of your antipsychotic or have it switched to every other day dosing. This study will last for 1 year. Participants will be evaluated at the beginning and every two weeks during the first 6 months, with visits once every 4 weeks for the final 6 months. In total, participants will make 22 visits over 52 weeks to the investigator's office. The investigators hypothesize that with ED, there will be no change in symptom severity but improvement in the frequency and severity of side effects, wellbeing, and functioning.

NCT Number	NCT04478838
Lead Sponsor	Centre for Addiction and Mental Health
Conditions	Schizophrenia and Related Disorders, Drug Administration Schedule, Drug Therapy, Antipsychotic Agents
Enrollment	120 participants
Start Date	2022-06-06
Primary Completion	2027-09-30 (estimated)
Study Completion	2028-09-30 (estimated)
Updated on ClinicalTrials.gov	2026-04-13