Staquet M
J Clin Pharmacol. 1978 Jan;18(1):76-9. doi: 10.1002/j.1552-4604.1978.tb01563.x.
Two consecutive double-blind, crossover, single-administration trials have shown that intramuscular meptazinol, a new opioid-antagonist drug, is superior to placebo and equivalent ot pentazocine in relieving chronic pain due to cancer.