And the cost of generic, injectable naloxone — which has been on the market since 1971 — has been climbing. A 10-mililiter vial sold by one of the dominant vendors costs close to $150, more than double its price from even a few years ago, and far beyond the production costs of the naloxone chemical, researchers say. The other common injectable, which comes in a smaller but more potent dose, costs closer to $40, still about double its 2009 cost.