Table 1.

Long-acting injectable naltrexone formulations.⁵⁰

Name	Maker	Duration	Route	Formulation	Dosage	Clinically available
Vivitrol	Alkermes	4 weeks	Gluteal IM	Microsphere suspension, single use administration mechanism	380 mg	Yes
Depotrex	BioTek	3–4 weeks depending on dosage	Gluteal IM	Microcapsule suspension, single use vial	192 and 394 mg	No
Naltrel	DrugAbuse sciences	4 weeks	Gluteal IM	Microsphere suspension, single use vial	150 and 300 mg	No