How long does Amisulpride Injection stay in your system?
Last updated September 7, 2026.
**Amisulpride injection, sold in the US as Barhemsys, has an elimination half-life of about 4 to 5 hours, so most people clear nearly all of it within about a day of the dose.** The exact timing depends on your kidney function, because amisulpride leaves the body mostly through urine and largely unchanged. With severe kidney impairment the drug lingers longer, which is why the label advises against using it in that setting. A second dose during the same surgical day can stretch the window a little further. Drowsiness or a mild drop in blood pressure usually settles within hours, well before the drug is fully gone. If you notice restlessness, muscle stiffness, or spasms after a dose, contact a clinician.
What to do
- Flag kidney problems: Tell your surgical team if you have reduced kidney function, since that is the main reason the drug stays around longer.
- Share your full medicine list: Include anything that affects heart rhythm, such as certain antibiotics, antiarrhythmics, or other antinausea drugs.
- Expect a short effect window: The antinausea benefit wears off within hours, so ask what to take if nausea returns later that day.
- Plan a safe ride home: Do not drive or make big decisions the rest of the day after surgery, since sedation from anesthesia and this drug can overlap.
- Watch the first day: Report restlessness, muscle stiffness, tremor, fainting, or a fast heartbeat to a clinician right away.
- Skip drug-test worry: Amisulpride is not on routine urine screens, but list it on any medical form asking about recent medicines.
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