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Drug Dependence

Drug Dependence

Medications are typically administered to achieve therapeutic effects. Some drugs can modify an individual's mood and perception, frequently resulting in various enjoyable experiences. However, this can result in drug dependency, a condition marked by continuous drug use despite potential negative consequences. Drug dependency primarily falls into two categories: psychological and physical dependence. Psychological dependence occurs when the pleasurable feelings induced by the drug...

Cholinergic Receptors: Nicotinic

Cholinergic Receptors: Nicotinic

Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
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Drugs Acting on Autonomic Ganglia: Stimulants

Drugs Acting on Autonomic Ganglia: Stimulants

Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...

Drug Abuse and Addiction: Pharmacological Phenomena

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Drug dependence, abuse, and addiction are complex phenomena that can precipitate various abnormal states. Physical dependence refers to a state of pharmacological adaptation to a drug. This adaptation often results in tolerance—a reduced response to the drug after repeated administrations. When the drug use is abruptly stopped, withdrawal symptoms occur due to the body's need to readjust from the pharmacologically induced imbalance. However, tolerance and withdrawal symptoms do not necessarily...

CNS Depressants: Alcohol and Nicotine

CNS Depressants: Alcohol and Nicotine

Ethanol, a clear colorless alcohol, has been consumed by humans for millennia, but its effects on the body are far from benign. At lower doses, it induces decreased inhibitions and loquaciousness, leading to its social appeal. However, it can cause severe consequences at higher doses, such as coma and respiratory depression, due to its zero-order elimination kinetics. Chronic ethanol abuse wreaks havoc on multiple organ systems, particularly the CNS and the liver. Abrupt cessation of ethanol...

Stimulants

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Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...

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Related Experiment Video

Updated: Jul 18, 2026

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Published on: February 10, 2012

Nicotine addiction and treatment

¹Nicotine Research Laboratory, V.A. Medical Center, Durham, North Carolina 27705, USA.

Annual Review of Medicine

|January 1, 1996

Summary

Nicotine addiction drives persistent smoking, making unaided quitting difficult. This review explores various therapies, including nicotine replacement and medications, to aid smoking cessation and manage withdrawal symptoms.

Area of Science:

Pharmacology
Addiction Medicine
Public Health

Background:

Cigarette smoking persists despite known health risks, primarily due to nicotine addiction.
Unaided smoking cessation attempts have low success rates, highlighting the need for effective interventions.

Purpose of the Study:

To review current and emerging therapeutic strategies for nicotine addiction and smoking cessation.
To discuss methods for alleviating nicotine withdrawal symptoms and promoting long-term abstinence.

Main Methods:

Literature review of pharmacotherapies and non-drug approaches for smoking cessation.
Discussion of nicotine replacement therapies (NRTs) like gum, patches, sprays, and inhalers.
Examination of pharmacotherapies including mecamylamine, clonidine, buspirone, and bupropion, alongside behavioral interventions.

More Related Videos

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Creating Dynamic Images of Short-lived Dopamine Fluctuations with lp-ntPET: Dopamine Movies of Cigarette Smoking

Creating Dynamic Images of Short-lived Dopamine Fluctuations with lp-ntPET: Dopamine Movies of Cigarette Smoking

Published on: August 6, 2013

Related Experiment Videos

Last Updated: Jul 18, 2026

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Spectral Confocal Imaging of Fluorescently tagged Nicotinic Receptors in Knock-in Mice with Chronic Nicotine Administration

Published on: February 10, 2012

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Local Application of Drugs to Study Nicotinic Acetylcholine Receptor Function in Mouse Brain Slices

Published on: October 29, 2012

Creating Dynamic Images of Short-lived Dopamine Fluctuations with lp-ntPET: Dopamine Movies of Cigarette Smoking

Creating Dynamic Images of Short-lived Dopamine Fluctuations with lp-ntPET: Dopamine Movies of Cigarette Smoking

Published on: August 6, 2013

Main Results:

Nicotine replacement therapies and various pharmacotherapies demonstrate efficacy in aiding smoking cessation.
Non-drug approaches mimicking smoking sensations offer an alternative cessation strategy.
Combination therapies may enhance success rates for managing nicotine dependence.

Conclusions:

Effective management of nicotine addiction requires a multifaceted approach combining pharmacotherapy and behavioral support.
Ongoing research into novel treatments is crucial for improving smoking cessation outcomes.
Addressing the neurobiological and behavioral aspects of nicotine dependence is key to public health efforts.