Question 1

What are the most common causes of nausea and vomiting?

Accepted Answer

Nausea and vomiting are symptoms rather than diseases and can arise from a wide range of causes including motion sickness, pregnancy (especially first-trimester morning sickness), viral gastroenteritis, medications (chemotherapy, opioids, antibiotics), postoperative recovery, inner ear disturbances (vertigo), and gastrointestinal conditions such as gastroparesis or intestinal obstruction. Identifying the underlying cause guides selection of the most appropriate antiemetic medication.

Question 2

What prescription medications treat nausea and vomiting?

Accepted Answer

Antiemetic drug classes include serotonin (5-HT3) receptor antagonists (ondansetron, granisetron — particularly effective for chemotherapy-induced and postoperative nausea), dopamine antagonists (metoclopramide, prochlorperazine — useful for gastroparesis and general nausea), antihistamines (promethazine, meclizine — for motion sickness and vestibular nausea), and neurokinin-1 (NK1) antagonists (aprepitant — added for highly emetogenic chemotherapy regimens). Dexamethasone is commonly added as part of multimodal antiemetic regimens in oncology; consult your healthcare provider to select the most appropriate agent for your specific cause.

Question 3

Is it safe to take anti-nausea medication during pregnancy?

Accepted Answer

Vitamin B6 (pyridoxine) alone or in combination with doxylamine (available as Diclegis/Bonjesta) is FDA-approved and is the recommended first-line pharmacological treatment for nausea and vomiting of pregnancy (NVP), endorsed by the American College of Obstetricians and Gynecologists (ACOG). For more severe NVP or hyperemesis gravidarum, other agents such as promethazine, metoclopramide, or ondansetron may be used with careful risk-benefit assessment; always consult your obstetrician before taking any medication during pregnancy.

Question 4

When is nausea and vomiting a medical emergency?

Accepted Answer

Seek emergency care if nausea and vomiting are accompanied by severe abdominal pain, signs of dehydration (extreme thirst, dark urine, dizziness, no urination for 8+ hours), bloody or bile-green vomit, fever above 101.5°F, a stiff neck, or symptoms suggesting a possible overdose or poisoning. Hyperemesis gravidarum (severe vomiting in pregnancy causing weight loss >5% and dehydration) also requires prompt medical attention; contact your healthcare provider or go to the emergency department if you are unable to keep any fluids down for more than 24 hours.

Nausea & Vomiting

Overview

Drug classes used to treat nausea & vomiting

Medications for nausea & vomiting

Frequently asked questions