11. Many of these drugs combat the side-effects of opioid analgesics , an added bonus. 12. Additional side effects include opioid analgesics . 13. Opioid analgesics reduce the soreness only for as long as they would work for any injury.14. "' Norhydrocodone "'is the major metabolite of the opioid analgesic hydrocodone. 15. "' Noroxycodone "'is the major metabolite of the opioid analgesic oxycodone. 16. It is a moderately potent opioid analgesic , generally indicated for relief of moderate to severe pain. 17. "' Properidine "'is an opioid analgesic and the isopropyl analog of pethidine. 18. It is one of the most effective orally administered opioid analgesics and has a wide safety margin. 19. "' Methylketobemidone "'is an opioid analgesic that is an analogue of ketobemidone. 20. "' Propylketobemidone "'is an opioid analgesic that is an analogue of ketobemidone.
