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Excessive QT prolongation can trigger tachycardias such as torsades de pointes (TdP). QT prolongation is an established side effect of antiarrhythmics, but can also be caused by a wide range of non-cardiac medicines, including antibiotics, antidepressants, antihistamines, opioids, and complementary medicines.
Dofetilide does not affect dV/dT max (the slope of the upstroke of phase 0 depolarization), conduction velocity, or the resting membrane potential. Dofetilide synthesis There is a dose-dependent increase in the QT interval and the corrected QT interval (QTc).
It is also used in chemotherapy as a single drug as well as with other antiemetics such as 5-HT 3 receptor antagonists and NK1 receptor antagonist, but the specific mechanism of action is not fully understood. [17] Other Trimethobenzamide is thought to work on the CTZ; Ginger contains 5-HT 3 antagonists gingerols, shogaols, [18] and ...
All 5-HT 3 antagonists have been associated with asymptomatic electrocardiogram changes, such as prolongation of the PT and QTc intervals and certain arrhythmias. [28] The clinical significance of these side effects is unknown.
In 2001, the FDA changed the labeling requirements for droperidol injection to include a Black Box Warning, citing concerns of QT prolongation and torsades de pointes.The evidence for this is disputed, with 9 reported cases of torsades in 30 years and all of those having received doses in excess of 5 mg. [9] QT prolongation is a dose-related effect, [10] and it appears that droperidol is not a ...
Serious side effects include QT prolongation and severe allergic reaction. [8] It appears to be safe during pregnancy but has not been well studied in this group. [8] It is a serotonin 5-HT 3 receptor antagonist. [8] It does not have any effect on dopamine receptors or muscarinic acetylcholine receptor and therefore does not cause akathisia. [11]
In a 2013 meta-analysis of the efficacy and tolerability of 15 antipsychotic drugs it was found to produce the second least (after haloperidol) weight gain, the least QT interval prolongation, the fourth most extrapyramidal side effects (after haloperidol, zotepine and chlorpromazine) and the sixth least sedation (after paliperidone, sertindole ...
Amisulpride is approved and used at low doses in the treatment of dysthymia and major depressive disorder. [10] [20] [11] [21] [22] [23] Whereas typical doses used in schizophrenia block postsynaptic dopamine D 2-like receptors and reduce dopaminergic neurotransmission, low doses of amisulpride preferentially block presynaptic dopamine D 2 and D 3 autoreceptors and thereby disinhibit dopamine ...