Generic Medicine Info
Indications and Dosage
Acute psychosis
Adult: 400-800 mg bid. Max: 1.2 g daily. Patients w/ predominantly negative symptoms: 50-300 mg daily.
Renal Impairment
CrCl (mL/min) Dosage
10-30 One-third of the usual dose.
31-60 Half the usual dose.
Should be taken on an empty stomach. Preferably taken before meals.
Phaeochromocytoma, concomitant prolactin-dependent tumours (e.g. pituitary gland prolactinomas or breast cancer). Pre-pubertal childn. Combination w/ levodopa.
Special Precautions
Patient w/ history of epilepsy; Parkinson's disease, CV disease. Avoid abrupt withdrawal. Renal impairment. Elderly. Pregnancy and lactation.
Adverse Reactions
Insomnia, anxiety, agitation, drowsiness, wt gain, acute dystonia, parkinsonism, akathisia, tardive dyskinesia, QT prolongation, hypotension, bradycardia, GI disorders (e.g. constipation, nausea, vomiting, dry mouth), hyperglycaemia; breast pain, erectile dysfunction, amenorrhoea, gynaecomastia, galactorrhoea. Rarely, allergic reactions, abnormal LFTs, seizures.
Potentially Fatal: Neuroleptic malignant syndrome.
Patient Counseling Information
This drug may cause somnolence, if affected, may impair ability to drive or operate machinery.
Symptoms: Generalised convulsions, coma, motor restlessness, tachycardia, slight prolongation of the QT interval, drowsiness, sedation, hypotension, extrapyramidal symptoms. Management: Symptomatic and supportive treatment. Institute close supervision of vital functions including continuous cardiac monitoring until patient recovers. Perform gastric lavage. In case severe extrapyramidal symptoms occur, administer anticholinergic agents.
Drug Interactions
Increased risk of arrhythmias w/ cisapride, thioridazine, halofantrine, erythromycin, some antiarrhythmics, pimozide, haloperidol, TCAs, β-blockers, some Ca channel blockers, clonidine, guanfacine, digoxin, K-depleting diuretics, lithium, antimalarials. May enhance effects of antihypertensives and CNS depressants (e.g. sedative H1-antihistamines, narcotics, anaesthetics, analgesics, barbiturates, benzodiazepines, other anxiolytics, clonidine and derivatives).
Potentially Fatal: Reciprocal antagonism between levodopa and neuroleptics.
Food Interaction
May enhance central effects of alcohol.
Mechanism of Action: Amisulpride is a substituted benzamide atypical antipsychotic which binds selectively w/ a high affinity to human dopaminergic D2 and D3 receptor subtypes.
Absorption: Absorbed from GI tract. Bioavailability: Approx 48%. Time to peak plasma concentration: 1 hr (initial); 3-4 hr (2nd).
Distribution: Volume of distribution: 5.8 L/kg. Plasma protein binding: Approx 16%.
Metabolism: Limited metabolism.
Excretion: Mainly via urine as unchanged drug. Terminal elimination half-life: Approx 12 hr.
Chemical Structure

Chemical Structure Image

Source: National Center for Biotechnology Information. PubChem Database. Amisulpride, CID=2159, (accessed on Jan. 20, 2020)

Store below 25°C.
MIMS Class
Buckingham R (ed). Amisulpride. Martindale: The Complete Drug Reference [online]. London. Pharmaceutical Press. Accessed 17/11/2014.

Joint Formulary Committee. Amisulpride. British National Formulary [online]. London. BMJ Group and Pharmaceutical Press. Accessed 17/11/2014.

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