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These side effects are serious and some of them are permanent, and many remain a crucial concern for companies and healthcare professionals and substantial efforts are being encouraged to reduce the potential risks for future antipsychotics through more clinical trials and drug development.
The latter have a greater degree of anticholinergic and antihistaminergic activity, which can counteract dopamine-related side-effects. [172] Atypical antipsychotic drugs have a similar blocking effect on D 2 receptors; however, most also act on serotonin receptors, especially 5-HT 2A and 5-HT 2C receptors. Both clozapine and quetiapine appear ...
The side effects reportedly associated with the various atypical antipsychotics vary and are medication-specific. Generally speaking, atypical antipsychotics are widely believed to have a lower likelihood for the development of tardive dyskinesia than the typical antipsychotics. However, tardive dyskinesia typically develops after long-term ...
Typical antipsychotics block the dopamine 2 receptor (D2) receptor, causing a tranquilizing effect. [5] It is thought that 60–80% of D2 receptors need to be occupied for antipsychotic effect. [5] For reference, the typical antipsychotic haloperidol tends to block about 80% of D2 receptors at doses ranging from 2 to 5 mg per day. [5]
Clozapine, sold under the brand name Clozaril among others, is a psychiatric medication and was the first atypical antipsychotic to be discovered. [6] It is primarily used to treat people with schizophrenia and schizoaffective disorder who have had an inadequate response to two other antipsychotics, or who have been unable to tolerate other drugs due to extrapyramidal side effects.
Antipsychotics by class Generic name Brand names Chemical class ATC code Typical antipsychotics; Acepromazine: Atravet, Acezine: phenothiazine: N05AA04
Common adverse effects of olanzapine, occurring from 1–10%, include: Gynecomastia [8] Extrapyramidal symptoms (EPS) (dose-dependent). Tends to produce less extrapyramidal side effects than typical antipsychotics but more extrapyramidal side effects than sertindole, clozapine and quetiapine. [9] [10]
Serious side effects may include movement disorders including tardive dyskinesia and neuroleptic malignant syndrome. [6] Use in pregnancy and breastfeeding is generally not recommended. [10] It is a typical antipsychotic which is believed to work by reducing the action of dopamine in the brain. [6]
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