Aripiprazole 2-month ready-to-use 960 mg (Ari 2MRTU 960) is a new long-acting injectable (LAI) antipsychotic formulation for gluteal administration every 2 months, intended for the treatment of schizophrenia and maintenance monotherapy treatment of bipolar I disorder (BP-I). This 32-week trial evaluated the safety, tolerability, and pharmacokinetic profile of multiple-dose gluteal administration of Ari 2MRTU 960 in clinically stable adult patients with a diagnosis of schizophrenia or BP-I, versus that of aripiprazole once-monthly 400 mg (AOM 400; an LAI indicated for the treatment of schizophrenia and maintenance monotherapy treatment of BP-I).

This was an open-label, multiple-dose, randomized, parallel-arm trial conducted at 16 sites in the US. Eligible patients (N=266) were randomized to receive Ari 2MRTU 960 every 56±2 days (n=132; 4 injections in total) or AOM 400 every 28±2 days (n=134; 8 injections in total). Safety and tolerability were evaluated throughout the study; assessments included adverse event reporting, patient reporting of injection site pain, and monitoring of extrapyramidal symptoms.

In the Ari 2MRTU group, 102 patients (77.3%) completed the study; in the AOM 400 group, 92 patients (68.7%) completed the study. The overall incidence of treatment-emergent adverse events (TEAEs) was similar between Ari 2MRTU 960 and AOM 400 (71.2% versus 70.9%, respectively). The most frequently reported TEAEs were increased weight (22.7% for Ari 2MRTU 960 versus 20.9% for AOM 400) and injection site pain (18.2% for Ari 2MRTU 960 versus 9.0% for AOM 400), none of which were assessed as serious or severe by the investigators. All injection site pain events in the Ari 2MRTU 960 group were assessed as mild or moderate in severity; most (15.9%) coincided with the first injection and resolved within 5 days. Extrapyramidal symptom scores remained unchanged in both treatment groups.

Multiple-dose administration of Ari 2MRTU 960 was generally well tolerated in patients with schizophrenia or BP-I and did not show any new safety concerns.

Otsuka Pharmaceutical Development & Commercialization, Inc. (Princeton, NJ, USA) and H. Lundbeck A/S (Valby, Denmark)