How long does Amisulpride Injection take to work?
Last updated September 7, 2026.
**Amisulpride injection works quickly: it goes straight into a vein, and relief from nausea is usually noticeable within about 30 minutes.** In the US, amisulpride injection is sold as Barhemsys and is used only to prevent or treat nausea and vomiting after surgery. Because it is given intravenously over 1 to 2 minutes, drug levels peak almost immediately rather than building up over days. Timing feels different depending on the situation: a dose given at the start of anesthesia is meant to keep nausea from starting, while a dose given in recovery is judged by how you feel over the next hour. Anesthesia, opioid pain medicine, and motion during transport can all keep nausea going even after the drug is on board. This injection is not the same as oral amisulpride used outside the US as an antipsychotic, which takes weeks to show its full effect.
What to do
- Expect minutes, not days: An IV dose acts within about half an hour, so judge it by the end of that first hour.
- Speak up in recovery: Tell your nurse if nausea persists or returns so another antiemetic can be added.
- Know the one-dose limit: Amisulpride injection is given as a single 10 mg dose, and repeat doses are not recommended.
- Share your full drug list: Mention any medicine that affects heart rhythm, since this drug can prolong the QT interval.
- Flag kidney problems: Reduced kidney function changes how long the drug stays in your body, so your team needs to know.
- Do not confuse it with tablets: Oral amisulpride is a different use and a different timeline, and it is not approved in the US.
Related questions
- Can an online doctor fill out disability paperwork
- Can an online doctor fill out fmla paperwork
- Can an online doctor order blood work
- Can i drink water before fasting blood work