A combination of two medications, injectable naltrexone and oral bupropion, was safe and effective in treating adults with moderate or severe methamphetamine use disorder in a double-blind, placebo-controlled Phase III clinical trial. The findings suggest this combination therapy may be a promising addition to current approaches to treatment, such as cognitive behavioral therapy and contingency management interventions, for a very serious condition that remains difficult to treat and overcome. The research, published today in The New England Journal of Medicine, was conducted at multiple sites within the National Institute on Drug Abuse Clinical Trials Network (NIDA CTN). NIDA is part of the National Institutes of Health.