All of the following are true about opioids except?
Nalmefene is a derivative of Naltrexone and is orally effective and longer acting. Naltrexone, is a medication primarily used to manage alcohol or opioid dependence. An opioid-dependent person should not receive naltrexone before detoxification. It is taken by mouth or by injection into a muscle. Effects begin within 30 minutes. All the other statements are true. Ref: KD Tripathi 8th ed.
Naloxone is sho acting
Naltrexone is used to lower craving in alcoholics
Nalmefene can be used for opioid poisoning
Nalmefene is shoer acting than naloxone
Central Nervous system