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Related Concept Videos

Drugs Acting on Autonomic Ganglia: Stimulants01:23

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...
Adrenergic Agonists: Indirect-Acting Agents01:25

Adrenergic Agonists: Indirect-Acting Agents

Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
Adrenergic Agonists: Mixed-Action Agents01:28

Adrenergic Agonists: Mixed-Action Agents

Mixed-action adrenergic agonists, like ephedrine and pseudoephedrine, directly and indirectly affect adrenergic receptors. These agents stimulate adrenoceptors and indirectly release stored neurotransmitters, amplifying the adrenergic response.
Ephedrine and pseudoephedrine lack a catecholamine group, making them less susceptible to degradation by metabolic enzymes. They have increased oral bioavailability and lipophilicity, resulting in a longer duration of action. Their response is reduced by...
Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
CNS Stimulants: Cocaine, Amphetamines and Cannabinoids01:24

CNS Stimulants: Cocaine, Amphetamines and Cannabinoids

CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its effects by...
Stimulants01:29

Stimulants

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 26, 2026

Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry
07:30

Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry

Published on: November 21, 2012

Cardiovascular effects of methamphetamine.

J Lynch, M A House

    The Journal of Cardiovascular Nursing
    |January 1, 1992
    PubMed
    Summary

    Methamphetamine (MAP) abuse is rising, with easy production and availability. This article covers MAP

    Area of Science:

    • Pharmacology
    • Toxicology
    • Cardiovascular Effects

    Background:

    • Stimulant abuse, including methamphetamine (MAP), has increased.
    • MAP, also known as crank or crystal meth, is easily synthesized and widely accessible.

    Purpose of the Study:

    • To describe the pharmacology of methamphetamine.
    • To outline the cardiovascular effects and toxicology of MAP.
    • To present management principles for MAP abuse.

    Main Methods:

    • Literature review on methamphetamine.
    • Analysis of pharmacological data.
    • Review of clinical management strategies.

    Main Results:

    • Methamphetamine exhibits specific pharmacological properties.

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    Neurotoxicity Assessment in Adult Danio rerio using a Battery of Behavioral Tests in a Single Tank
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    Single Cell Measurement of Dopamine Release with Simultaneous Voltage-clamp and Amperometry
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    Published on: November 21, 2012

    A General Method for Evaluating Deep Brain Stimulation Effects on Intravenous Methamphetamine Self-Administration
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    Published on: November 3, 2023

  • MAP use is associated with significant cardiovascular risks.
  • Effective management strategies for MAP abuse exist.

    • Conclusions:

    • Understanding methamphetamine's effects is crucial for treatment.
    • Cardiovascular monitoring and intervention are vital in MAP abuse cases.
    • Comprehensive management approaches are necessary for addressing MAP abuse.