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Impact of traditional versus nontraditional initiation dosing schedule of paliperidone palmitate on 30-day readmission and safety.

INTRODUCTION: Paliperidone palmitate (PP), a second-generation long-acting injectable antipsychotic, requires 2 injections upon initiation. Due to the fast-paced nature of the inpatient setting, the second dose may be administered earlier than recommended by labeled use despite the lack of evidence that evaluates this practice.

METHODS: This was a retrospective chart review that investigated the outcomes associated with the timing of the second PP initiation dose with the aim of comparing patients who received the second PP dose fewer than 3 days after the first injection with those who received it between 3 and 11 days after the first injection. The primary outcomes included 30-day psychiatric readmission, index hospitalization length of stay, and time until the next psychiatric hospitalization. Secondary outcomes included 6-month readmission and the percentage of patients who experienced an adverse event after the second injection.

RESULTS: No statistically significant differences were observed between groups for 30-day readmission. There was a statistically significant shortened index length of hospitalization (median, 2 vs 4 days; P < 0.001) and a non-statistically significant trend for time until the next psychiatric hospitalization (median, 25 vs 47 days) when comparing those who received the nontraditional loading regimen to those who received the traditional labeled loading regimen. No differences were observed in the secondary outcomes or safety/tolerability.

DISCUSSION: The results of the study indicate that there are no significant differences in readmission rates and adverse drug reactions in those who received the second PP dose earlier than recommended per labeled use. Larger, controlled studies are needed to further investigate clinical and safety outcomes.

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