How Nausea Medications Work

Nausea is a complex symptom that can be caused by various factors, including chemotherapy, radiation therapy, motion sickness, and gastrointestinal disorders. To effectively manage nausea, medications target different receptors and pathways in the body.

Gold Standard: Ondansetron (5-HT3 antagonist)

Ondansetron is a 5-HT3 receptor antagonist that works by blocking the action of serotonin at the 5-HT3 receptors in the brain. This leads to a decrease in the vomiting reflex, making it an effective treatment for nausea caused by chemotherapy and radiation therapy.

Alternatives: Dopamine Antagonists, NK1 Receptor Antagonists, and H2 Blockers

• Metoclopramide (Dopamine antagonist): Works by blocking dopamine receptors in the brain, which can help reduce nausea and vomiting.
• Aprepitant (NK1 receptor antagonist): Blocks the action of substance P at NK1 receptors, reducing the release of other neurotransmitters that contribute to nausea and vomiting.
• Famotidine (H2 blocker): Reduces stomach acid production by blocking histamine H2 receptors, which can help alleviate nausea and vomiting caused by gastrointestinal disorders.