Which antiemetic is used primarily for patients experiencing postoperative nausea and vomiting?

• A. Promethazine
• B. Granisetron
• C. Ondansetron
• D. Metoclopramide

Answer: (B)

Granisetron is an antagonist of serotonin (5-HT3) receptors and is specifically effective in preventing nausea and vomiting induced by chemotherapy and postoperative conditions. Its mechanism involves blocking the actions of serotonin, which can trigger nausea when released in the gastrointestinal tract following surgical procedures.

In the context of postoperative nausea and vomiting, the use of granisetron is particularly advantageous because it not only provides effective relief but also has a favorable side effect profile compared to some alternatives. This makes it a preferred choice for managing nausea in patients who have undergone surgical procedures, especially when nausea can complicate recovery.

While other agents like ondansetron and promethazine may also be used for similar indications, granisetron’s specific formulation and effectiveness in a postoperative setting makes it the most suitable choice in this scenario.