Antiemetics include: 1  5-HT3 receptor antagonists block serotonin receptors in the central nervous system and gastrointestinal tract. 2  As such, they can be used to treat post-operative and cytotoxic drug nausea & vomiting. 3  However, they can also cause constipation or diarrhea, dry mouth, and fatigue.hey may be used for severe cases of gastroenteritis, especially if the patient is dehydrated. Antiemetics, though previously thought to cause birth defects, have been proven safe for use by pregnant women in the treatment of morning sickness and the more serious hyperemesis gravidarum.
1 The gaseous state of a substance that is liquid or solid at room temperature. 2  A faintly visible suspension of fine particles of matter in the air, as mist, fumes, or smoke. 3  A mixture of fine droplets of a substance and air, as the fuel mixture of an internal-combustion engine.
Chambers 20th Century Dictionary(0.00 / 0 votes)Rate this definition: 1  Fog. fog, n. a thick mist: watery vapour rising from either land or water.âv.t. to shroud in fog.âv.i. to become coated with a uniform coating.âns. 2  Fog.