psychotropic drug
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What is a psychotropic drug?
Psychotropic drugs are pharmacological agents that can alter behavior, mood, perception, awareness, or sensation. They are largely used to treat mental health conditions, including sleep disorders, pain, anxiety, depression, and psychosis.
These drugs work by mimicking, blocking, or altering neurotransmitters, which are signaling molecules in the brain. The five main classes of psychotropic drugs include antianxiety agents, antidepressants, antipsychotics, hypnotics, and mood-stabilizing drugs. Each class affects neurotransmitters in different ways to produce its therapeutic effects.
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What effects do psychotropic drugs have on a person’s mind or mood?
Psychotropic drugs impact a person's mind or mood by altering neurotransmitters, which are signaling molecules in the brain. These drugs can mimic or block the effects of neurotransmitters, or change their storage, release, or uptake.
There are five main classes of psychotropic drugs:
* Antianxiety agents reduce the transmission of nerve impulses, resulting in a calming effect.
* Antidepressants restore chemical imbalances in neurotransmitter levels in the brain, which mitigates symptoms of depression.
* Antipsychotics calm agitation and excitement, reduce symptoms of schizophrenia, mania, and delirium, and can improve a patient’s lucidity and receptiveness to psychotherapy.
* Mood stabilizers reduce excitatory activity and increase inhibitory activity in the brain and are often used to treat depression and bipolar disorder.
* Stimulants increase levels of catecholamine neurotransmitters, resulting in increased activity at the receptors for these neurotransmitters; they are used to treat attention deficit-hyperactivity disorder.4 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
What are some common types of psychotropic drugs?
Psychotropic drugs alter awareness, behavior, mood, perception, or sensation and are used to treat a range of conditions, including sleep disorders, pain, anxiety, depression, and psychosis.
Common types of psychotropic drugs:
* Antianxiety agents Benzodiazepines enhance the effects of GABA, producing a calming effect. Buspirone is a partial agonist of serotonin receptors.
* Antidepressants Restore chemical imbalances in neurotransmitter levels. Classes include tricyclic antidepressants, monoamine oxidase inhibitors (MAOIs), selective serotonin reuptake inhibitors (SSRIs), and others. They inhibit the body’s reabsorption or inactivation of monoamine neurotransmitters.
* Antipsychotics Typical antipsychotics block dopamine receptors. Atypical antipsychotics inhibit neurotransmitters like acetylcholine, dopamine, norepinephrine, or serotonin.
* Mood-stabilizing drugs Lithium reduces excitatory activity of dopamine and glutamate and increases inhibitory activity of GABA. Carbamazepine modulates inhibitory effects on neurons.
* Hypnotics Some benzodiazepines are used primarily as sleeping pills to treat insomnia or to relieve strain from stressful circumstances.
* Stimulants Increase levels of catecholamine neurotransmitters. They are used to treat attention deficit-hyperactivity disorder (ADHD).6 Britannica SourcesCreated from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles. -
How do psychotropic drugs work in the brain?
Psychotropic drugs change awareness, behavior, mood, perception, or sensation. They work by affecting neurotransmitters, which are signaling molecules in the brain that transmit information between neurons. These drugs can mimic or block the effects of neurotransmitters or change how they are stored, released, or taken up by neurons. Some psychotropic drugs restore the balance of neurotransmitters by preventing their breakdown.
Examples of neurotransmitters that psychotropic drugs affect include dopamine, gamma-aminobutyric acid (GABA), norepinephrine, and serotonin.
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What are some possible side effects of psychotropic drugs?
Psychotropic drugs, which include antianxiety agents, antidepressants, antipsychotics, hypnotics, and mood stabilizers, can have varying side effects.
Side effects of antianxiety drugs like benzodiazepines may lead to dependence and withdrawal symptoms, but others such as buspirone have a lower abuse potential and are not associated with withdrawal.
Antidepressants may cause sleepiness, tremors, anxiety, loss of sexual desire, and nausea. Tricyclic antidepressants can cause dry mouth, blurred vision, constipation, dizziness, and difficulty urinating. In rare cases, antidepressants can have life-threatening side effects or dangerous drug interactions.
Antipsychotic drugs may result in extrapyramidal symptoms, such as tremors, uncontrolled facial movements, muscle stiffness, and balance issues. Atypical antipsychotics may increase the risk of diabetes, high cholesterol, heart problems, involuntary movements, stroke, and suicidal thoughts in patients under 18. Neuroleptic malignant syndrome is a rare but potentially fatal side effect of antipsychotic drugs that causes rigidity, catatonia, and autonomic instability. Long-term use of stimulants can also lead to dependence, increased heart rate, high blood pressure, insomnia, and weight loss.
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Why is it important for doctors to monitor patients taking psychotropic drugs?
Monitoring patients on psychotropic drugs is crucial due to the significant side effects associated with these medications. These drugs impact neurotransmitters like dopamine, GABA, norepinephrine, and serotonin, and can lead to a range of adverse effects, including sleepiness, tremors, anxiety, and more severe issues like extrapyramidal symptoms (uncontrolled movements) and increased risks of diabetes or heart problems. Regular monitoring allows doctors to adjust dosages, manage side effects, and ensure patient safety and well-being.
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psychotropic drug, in pharmacology, any agent that induces changes in awareness, behaviour, mood, perception, or sensation. Most psychotropic drugs are classified as one of five different types: antianxiety agents, antidepressants, antipsychotics, hypnotics, or mood-stabilizing drugs. Psychotropic drugs are used to treat a broad array of conditions, from sleep disorders and pain to anxiety, depression, and psychosis.
Psychotropic drugs exert their actions by either mimicking the effects, blocking the activity, or altering the storage, release, or uptake of neurotransmitters (signaling molecules in the brain that relay information between neurons and between neurons and other types of cells). Some psychotropic drugs restore the balance of neurotransmitters by preventing their breakdown once released from neurons. Examples of neurotransmitters that can be affected by psychotropic drugs include dopamine, gamma-aminobutyric acid (GABA), norepinephrine, and serotonin.
The five main classes of psychotropic drugs are distinguished primarily by the effects that result from their actions on neurotransmitters. Many antianxiety drugs, for example, are benzodiazepine compounds (e.g., clonazepam, diazepam), which bind to neurons at locations near ion channels that admit chloride ions into the cell and also near sites of action for GABA. GABA exerts inhibitory actions on certain neurons and thereby reduces the transmission of nerve impulses; benzodiazepines generally enhance the effects of GABA, resulting in a calming effect. Other antianxiety drugs have similar physiological effects but do not act on GABA. Buspirone, for example, is thought to be a partial agonist of receptors for serotonin, the activity of which is associated with mood changes.
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Antidepressants comprise a diverse group of agents. They are divided into multiple classes, among them tricyclic antidepressants, monoamine oxidase inhibitors (MAOIs), selective serotonin reuptake inhibitors (SSRIs), norepinephrine reuptake inhibitors (NRIs), serotonin-norepinephrine reuptake inhibitors (SNRIs), and atypical antidepressants, which possess unique structural features and mechanisms of action. These drugs act by restoring chemical imbalances in neurotransmitter levels in the brain, thereby mitigating symptoms of depression, which result from reduced quantities or reduced activity of the monoamine neurotransmitters (e.g., serotonin, norepinephrine, and dopamine). All antidepressants achieve their effects by inhibiting the body’s reabsorption or inactivation of monoamine neurotransmitters, thus allowing the neurotransmitters to accumulate and remain in contact with their receptors for prolonged periods of time; these changes are thought to be important in elevating mood and relieving depression.
Antipsychotic drugs are subdivided into typical and atypical antipsychotics. Typical antipsychotic drugs, sometimes also referred to as first-generation antipsychotics, work by blocking dopamine receptors; examples include chlorpromazine, fluphenazine, and haloperidol. The mechanism of action of atypical antipsychotics, sometimes called second-generation antipsychotics, is less clear, though they seem to inhibit various neurotransmitters, particularly acetylcholine, dopamine, norepinephrine, or serotonin. Examples of atypical antipsychotics include aripiprazole, clozapine, and iloperidone.
Drugs used to stabilize mood work in a variety of ways. Lithium, for example, reduces the excitatory activity of dopamine and glutamate and increases the inhibitory activity of GABA. Carbamazepine, an anticonvulsant drug, modulates inhibitory effects of neurons by altering the activity of voltage-gated ion channels, including those involved in the conductance of calcium, potassium, and sodium. Mood-stabilizing drugs are often used in the treatment of depression and bipolar disorder.
Stimulant-type psychotropic drugs generally work by increasing levels of catecholamine neurotransmitters (e.g., dopamine, epinephrine, and norepinephrine); this results in increased activity at the receptors for these neurotransmitters. Stimulants prescribed as psychotropic drugs are specifically used to treat attention deficit-hyperactivity disorder.
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Side effects of psychotropic drugs vary markedly. For instance, whereas benzodiazepine drugs can be habit-forming and potentially cause dependence and withdrawal symptoms, buspirone has a much lower potential for abuse and is not associated with withdrawal phenomena. Side effects vary among the types of antidepressants and may include sleepiness, tremors, anxiety, loss of sexual desire, and nausea. Antipsychotic drugs are associated with many different adverse effects, including extrapyramidal symptoms, which can cause tremors, uncontrolled facial movements (or tics), muscle stiffness, and difficulty maintaining balance. Atypical antipsychotics increase the risk of diabetes, high cholesterol, heart problems, involuntary movements, and stroke, and they tend to heighten the risk of suicidal thoughts among patients under age 18. Long-term use of stimulants can lead to dependence, and some individuals may experience an increase in heart rate or blood pressure, insomnia, poor appetite, and weight loss.