An example of a 5-HT3 receptor antagonist is:
- A- Bromocryptine (Parlodel).
- B- Cimetidine (Tagamet).
- C- Ondanestron (Zofran).
- D- Fluoxetine (Prozac).
The correct answer is C- Ondanestron (Zofran).
Here's why:
A- Bromocryptine (Parlodel):
is a dopamine agonist, primarily used for treating Parkinson's disease and hyperprolactinemia. It does not interact with 5-HT3 receptors.
B- Cimetidine (Tagamet):
is an H2 receptor antagonist, primarily used for treating heartburn and ulcers. It does not interact with 5-HT3 receptors.
C- Ondanestron (Zofran):
is a 5-HT3 receptor antagonist, commonly used to prevent and treat nausea and vomiting caused by chemotherapy, radiation therapy, and postoperatively.
D- Fluoxetine (Prozac):
is a selective serotonin reuptake inhibitor (SSRI), primarily used for treating depression and anxiety. It acts on different serotonin receptors than 5-HT3.
Therefore, Ondanestron (Zofran) is the specific example of a 5-HT3 receptor antagonist, while the other options act on different receptors or have different targets.
