NREMT Advanced-EMT Practice Test

Giving ondansetron by IV slowly helps prevent a sudden drop in blood pressure that can trigger fainting. When the medication enters the bloodstream rapidly, plasma levels spike quickly and can cause a vasovagal or hypotensive response in a patient who may already be dehydrated or nauseated. Administering the IV dose over a couple of minutes (slow IV push) reduces that peak concentration and gives the cardiovascular system time to adjust, lowering the risk of a syncopal episode. Oral forms or IM injections avoid this IV-related risk, but if IV treatment is used, a slow rate is the safer approach.