Table 5. Antiemetics based on recommendations by the American College of Physicians.

Drug	Cause of nausea	Dose
Prochlorperazine	Initiation of opioid therapy	10 mg orally or 25 mg rectally, 2 or 3 times daily
Haloperidol	Stimulation of chemoreceptor	1.5–5 mg, orally 3–4 times daily; 2–10 mg
		Intramuscularly, 2 or 3 times daily
Prochlorperazine	Trigger zone by chemotherapy	10 mg orally or 25 mg rectally, 2 or 3 times daily
Methotrimeprazine		2–6.25 mg intramuscularly, 3 times daily; 6–25 mg, over 24 h
Scopolamine (transdermal patch)	Vertigo	Apply 1 patch every 2–3 days
Meclizine		50 mg orally or 25–50 mg intramuscularly, 3 times daily
Metoclopramide	Delayed gastric emptying	10–20 mg, 2–3 times daily; 1–3 mg h intravenously
Octreotide	Bowel obstruction	50–100 lg subcutaneously 2 or 3 times daily or 300 lg
		During 24hours subcutaneously
Ondansetron	Multiple causes, refractory	4–8 mg orally, 2 or 3 times daily
Dexamethasone		2–4 mg orally, 2 or 3 times daily