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Related Concept Videos

Drug Therapy01:28

Drug Therapy

The advent of drug therapy has profoundly shaped modern mental health care, providing targeted treatments for a range of psychological disorders. Psychotherapeutic drugs, classified into antianxiety, antidepressant, and antipsychotic medications, address symptoms across anxiety disorders, mood disorders, and schizophrenia. While these medications have transformed patient outcomes, they require careful management due to their potential side effects and limitations.
Antianxiety Medications
Dosage Regimen: Individualization01:24

Dosage Regimen: Individualization

Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

Rational Dosage Regimen: Maintenance Dose and Loading Dose

A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
In most cases, drugs are administered repetitively or infused continuously to maintain a steady-state concentration in the body. At a steady state,...
Dosage Regimens: Designs and Approaches01:28

Dosage Regimens: Designs and Approaches

Designing a dosage regimen, which refers to the manner of drug administration, is a complex process involving the selection of drug dose, route, and frequency. This process is underpinned by pharmacokinetic parameters derived from tests and population averages. These parameters are then tailored to patient-specific variables such as diagnosis, demographics, and allergy status. Once therapy commences, therapeutic response monitoring is critical and achieved through clinical and physical...
Antidepressant Drugs: MAOIs and Other Agents01:23

Antidepressant Drugs: MAOIs and Other Agents

Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance01:23

Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance

The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
A study on guinea pigs examined the...

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Related Experiment Videos

Optimizing dosing in atypical neuroleptic monotherapy.

Fabien Trémeau1, Leslie Citrome

  • 1Nathan S. Kline Institute for Psychiatric Research, Orangeburg, NX USA.

Dialogues in Clinical Neuroscience
|October 29, 2011
PubMed
Summary

Optimal atypical antipsychotic dosages vary. Clozapine requires specific plasma levels, while risperidone has a defined effective dose range. Olanzapine may benefit from higher doses, but quetiapine and ziprasidone require further investigation for optimal efficacy.

Keywords:
atypical neurolepticdose-response relationshipmonotherapyoptimal doseschizophrenia

Related Experiment Videos

Area of Science:

  • Psychiatry
  • Pharmacology

Background:

  • Atypical antipsychotics are first-line treatments for psychotic disorders.
  • Optimal dosing and efficacy of these medications remain areas of active research.

Purpose of the Study:

  • To review and summarize the optimal dosage ranges and plasma level considerations for several key atypical antipsychotics.
  • To identify current evidence regarding dose-efficacy relationships for clozapine, risperidone, olanzapine, quetiapine, and ziprasidone.

Main Methods:

  • Literature review and synthesis of existing clinical data and recommendations.
  • Analysis of reported plasma levels and their correlation with treatment response.

Main Results:

  • Clozapine: Target plasma level >350 ng/mL for non/partial responders (12h post-dose).
  • Risperidone: Optimal daily dose 4-8 mg; higher doses show no additional benefit.
  • Olanzapine: Doses of 30-40 mg/day may improve response; plasma level >23 ng/mL may predict response.
  • Quetiapine: Doses >800 mg/day lack robust evidence.
  • Ziprasidone: Doses >40 mg/day recommended; doses >200 mg/day require further study.

Conclusions:

  • Optimal dosing strategies differ significantly among atypical antipsychotics.
  • Further research is needed to establish definitive dose-efficacy relationships for quetiapine and ziprasidone.
  • Therapeutic drug monitoring, including plasma levels, may be valuable for certain agents like clozapine and olanzapine.