The drug used in the treatment of cessation of smoking & tobacco addiction
**Core Concept**
Bupropion and varenicline are the primary pharmacological agents used in the management of nicotine addiction, with the goal of reducing withdrawal symptoms and the urge to smoke.
**Why the Correct Answer is Right**
Varenicline works by selectively activating the α4β2 nicotinic acetylcholine receptor (nAChR) in the brain, thereby mimicking the effects of nicotine and reducing the reward associated with smoking. This leads to a decrease in the number of cigarettes smoked and an increase in the chances of successful smoking cessation.
**Why Each Wrong Option is Incorrect**
**Option A:** Naltrexone is primarily used in the management of opioid and alcohol dependence, not nicotine addiction. It works by blocking the μ-opioid receptor, which is not relevant to nicotine addiction.
**Option B:** Mirtazapine is an antidepressant that can be used in the treatment of depression, anxiety, and insomnia, but it is not specifically indicated for smoking cessation.
**Option C:** Clonidine is used to manage withdrawal symptoms in opioid and nicotine addiction, but it is not the primary pharmacological agent for smoking cessation.
**Clinical Pearl / High-Yield Fact**
It is essential to note that combination therapy, including counseling and behavioral support, is often more effective than pharmacotherapy alone in achieving smoking cessation.
**Correct Answer:** C. Clonidine