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Related Concept Videos

Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent inattention, hyperactivity, and impulsivity. It affects approximately 5-8% of children globally, with around 60-70% of cases persisting into adulthood. ADHD has significant implications for educational attainment, social interactions, and occupational success.
Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.
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...
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Adrenergic Agonists: Indirect-Acting Agents

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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...
Sedatives and Hypnotics Drugs: Miscellaneous Agents01:17

Sedatives and Hypnotics Drugs: Miscellaneous Agents

Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs01:28

Antidepressant Drugs: Tricyclics, SSRIs, and SNRIs

Tricyclic Antidepressants (TCAs), including Desipramine (Norpramin), Imipramine (Tofranil), Clomipramine (Anafranil), and Amitriptyline (Elavil), inhibit serotonin and norepinephrine reuptake and also block other receptors. They are used for depression, pain conditions, and insomnia. Common adverse effects include anticholinergic effects, sedation, orthostatic hypotension, and weight gain. They have a narrow therapeutic window and so require plasma-level monitoring. Abrupt discontinuation can...
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...

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Related Experiment Video

Updated: May 21, 2026

Event Related Potentials (ERPs) and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder (ADHD)
10:02

Event Related Potentials (ERPs) and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder (ADHD)

Published on: March 12, 2020

Stimulant side effects and inverted-U: implications for ADHD guidelines.

Florence Levy1

  • 1School of Psychiatry, University of New South Wales, Prince of Wales Hospital, Randwick, Australia. f.levy@unsw.edu.au

The Australian and New Zealand Journal of Psychiatry
|June 13, 2012
PubMed
Summary
This summary is machine-generated.

Genetic factors may predict stimulant side effects in attention deficit hyperactivity disorder (ADHD). Understanding these genetic variations, like COMT polymorphisms, can help personalize ADHD treatment and minimize adverse effects.

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Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol
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Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol

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Event Related Potentials (ERPs) and other EEG Based Methods for Extracting Biomarkers of Brain Dysfunction: Examples from Pediatric Attention Deficit/Hyperactivity Disorder (ADHD)
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Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol
13:09

Using Brain Activation (nir-HEG/Q-EEG) and Execution Measures (CPTs) in a ADHD Assessment Protocol

Published on: April 1, 2018

Area of Science:

  • Neuroscience
  • Pharmacogenetics
  • Child Psychiatry

Background:

  • Attention deficit hyperactivity disorder (ADHD) treatments often involve stimulants.
  • Stimulant medications can cause side effects, impacting treatment adherence and efficacy.
  • Individual variability in response to stimulants necessitates personalized treatment approaches.

Purpose of the Study:

  • To review existing literature on predicting stimulant side effects in ADHD.
  • To explore the role of genetic factors in stimulant-induced adverse effects.
  • To provide insights for updated clinical guidelines on stimulant use.

Main Methods:

  • Literature review focusing on dopamine's inverted-U effects in the prefrontal cortex (PFC).
  • Analysis of genetic polymorphisms, including catechol-O-methyltransferase (COMT) and dopamine transporter (DAT).
  • Examination of relevant neurobiological pathways, such as default mode processing and motor circuits.

Main Results:

  • COMT Met/Met polymorphisms may predict dopaminergic side effects like headache and introversion.
  • COMT Val/Val polymorphisms might be associated with therapeutic effects.
  • Dopamine transporter polymorphisms could be linked to motor-related side effects.
  • The inverted-U effect explains dose-dependent variability in stimulant response.

Conclusions:

  • Genetic prediction of stimulant side effects in ADHD warrants further investigation.
  • Understanding genetic influences can refine ADHD treatment guidelines.
  • Investigating treatment-emergent effects enhances comprehension of therapeutic mechanisms.