“Meta‐analyses of alcohol self‐administration (k = 9, N = 490) …, N = 748) confirmed that, under controlled experimental conditions, naltrexone reduces the …' g = −.277, SE = .074, 95 percent CI = −.421, −.133, p < .001) and magnitude of self‐reported …, SE = .066, 95 percent CI = −.416, −.156, p < .001) relative to placebo.”