When developing the plan of care for a 12-year-old child who is to receive chemotherapy that is associated with nausea and vomiting, the nurse should plan to administer an antiemetic at which of the...

When developing the plan of care for a 12-year-old child who is to receive chemotherapy that is associated with nausea and vomiting, the nurse should plan to administer an antiemetic at which of the following times?

1. Thirty minutes after the chemotherapy has started, then every 4 to 6 hours.

2. Thirty minutes before the chemotherapy starts, then every 4 to 6 hours.

3. When the 12-year-old requests medication for nausea, then every 4 hours as needed.

4. On starting the chemotherapy infusion, and then routinely every 8 hours.