viagra casero femenino Extended-release injectable naltrexone is a microsphere formulation of the opioid. How supplied: Single-use cartons, containing one 380 mg vial of Vivitrol. However, the monthly cost of injectable naltrexone is significantly higher than that. Vivitrol is an extended-release injectable version of naltrexone that is. to cover copays or off the cost of the shot for those without insurance. | ||||||
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