An antiemetic is a medication that is used to prevent or treat nausea and vomiting. Nausea and vomiting can be caused by a variety of factors, such as motion sickness, chemotherapy, radiation therapy, and postoperative recovery. Antiemetics work by blocking or reducing the signal that triggers the vomiting center in the brain.

Analgesics are a class of drugs that are used to relieve pain. They work by blocking the transmission of pain signals or by interfering with the brain's interpretation of those signals. There are several types of analgesics, including nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen and aspirin, acetaminophen, and opioid medications such as morphine and oxycodone.