Key takeaways
Promethazine (Phenergan) and Sancuso (granisetron) are both prescription medications used to manage nausea and vomiting, but they have different uses and forms. Promethazine is an antihistamine that also blocks dopamine and acetylcholine, making it versatile for treating allergies, motion sickness, and nausea. It comes in various forms, including tablets, oral solutions, suppositories, and injections. In contrast, Sancuso is an antiemetic specifically for preventing nausea and vomiting caused by chemotherapy. It works by blocking serotonin and is available only as a transdermal patch. Promethazine can cause drowsiness and is not recommended for children under 2 years old due to serious breathing risks, while Sancuso is generally well-tolerated but can be expensive and requires careful handling to avoid heat and sunlight exposure. Promethazine is available as a lower-cost generic, whereas Sancuso does not have a generic form.
