Drugs used in maintenance of substance dependance-a) Naloxoneb) Acamprosatec) Disulfiramd) Clonidine
**Core Concept**
The question pertains to pharmacotherapy for substance dependence, specifically focusing on medications used to maintain abstinence in individuals with alcohol or opioid use disorders. The underlying principle involves the use of medications to manage withdrawal symptoms, cravings, or other complications associated with substance dependence.
**Why the Correct Answer is Right**
Acamprosate (option b) is a medication used to maintain abstinence in individuals with alcohol dependence. It works by modulating glutamate and GABA neurotransmission, thereby reducing cravings and anxiety associated with alcohol withdrawal. Acamprosate is believed to stabilize chemical signaling in the brain, which helps individuals maintain sobriety.
**Why Each Wrong Option is Incorrect**
**Option A:** Naloxone is an opioid antagonist used to rapidly reverse opioid overdose, but it is not used for maintenance of substance dependence. Instead, it is used as a rescue medication to counteract the effects of opioids.
**Option C:** Disulfiram is a medication used to treat alcohol dependence by inducing an acute sensitivity to ethanol, thereby discouraging drinking. However, it is not typically used for maintenance of abstinence, as it can have adverse interactions with many medications and foods.
**Option D:** Clonidine is an alpha-2 adrenergic agonist used to manage withdrawal symptoms, such as anxiety and hypertension, in individuals with opioid or nicotine dependence. While it may be used as an adjunct therapy, it is not the primary medication for maintenance of substance dependence.
**Clinical Pearl / High-Yield Fact**
Acamprosate is often used in conjunction with counseling and behavioral therapy to maintain abstinence in individuals with alcohol dependence.
**Correct Answer:** B. Acamprosate