About antiemetics. Antiemetics are drugs used to relieve symptoms of nausea and vomiting. These drugs work by counteracting the neurotransmitter receptors that are involved in the physical process of these symptoms. Neurotransmitters are chemical substances that transmit nerve impulses, and receptors are cells or groups of cells that receive stimuli. Brand and generic medications must be approved by the FDA before they can be prescribed to patients. A brand medication is approved once the FDA has determined it is safe and effective based on data from clinical trials. Once it is approved, it is protected by patents so that other medications with the same active ingredients cannot be produced. Compazine for nausea is a medication that needs a prescription from your doctor; it is not an over-the-counter drug; It is important not to wait until the nausea gets too severe to take your dose as it takes approximately 30 minutes for the drug to work and if vomiting occurs before then, you may end up vomiting up your dose of prochlorperazine ; Prochlorperazine (Compazine®) may cause muscle. prochlorperazine (Compro, Compazine) thioridazine (Mellaril) thiothixene (Navane) trifluoperazine (Stelazine) Doctors don’t know the exact cause of this side effect. It may happen because. Buy Amoxicillin for cheap $0.49 per pill and treat your Bacterial infection. Order Amoxicillin at low cost from pillsfind and save your money. Antiemetic drugs help ease nausea and vomiting. There are many types, depending on the cause of the symptoms. Learn about these drugs, the risks, and more.