Depot olanzapine is a newly released formulation. This issue presents a clinical study (Kane, p.
181) comparing various depot intramuscular doses with daily oral dosing for patients already well maintained with 10—20-mg daily oral doses. They continued to take their oral medication or switched to one of four doses of the new depot formulation: 300 mg/2 weeks, 405 mg/4 weeks, 150 mg/2 weeks, or 45 mg/4 weeks. The study thus provides a dose-response curve for efficacy and side effects of the depot formulation. As seen in the
+figure, the patients taking the lowest depot dose had significantly more relapses over the 24-week study (>30%) than did the patients taking the highest dose (5%). The patients who continued to take oral doses did as well as patients taking the higher depot doses, with 7% relapsing with the oral doses. Weight gain greater than 7% was also similar in the oral doses and the highest depot dose, with 20% of patients affected. In his editorial (p.
125), Dr. John Davis suggests that depot medications continue to be a safe and effective alternative for the patient who cannot comply with oral medication.