Naltrexone is: March 2013: (A) (mu) agonist, (B) 6 (delta) agonist, (C) lc (kappa) antagonist, (D) NOP receptor antagonist
Answer is C. Ans. C i.e. lc antagonist Naltrexone is an opioid receptor antagonist used primarily in the management of alcohol dependence and opioid dependence.