"Opioids" differ from "opiates" in that they are:: (A) More powerful in action, (B) More long acting, (C) Synthetic derivatives, (D) Derived directly from opium
Answer is C. Opiods are synthetics while opiates are semi synthetic. Opiods include pethidine,fentanyl,methadone,dextropropoxyphene,tramadol. Semisynthetic opiates include heroin ,pholcodine,ethylmorphine . Ref: KD Tripathi 8th ed.