A client with Crohn's disease is admitted to the medical unit with a three-day history of abdominal cramping, nausea, and vomiting. Which prescription should the nurse implement first?

Send the client to x-ray for a flat plate of the abdomen.

Give a prescribed analgesic for temperature above 101°F (38.3°C).

Place an indwelling urinary catheter and attach to a bedside drainage unit.

Insert a nasogastric tube (NGT) and attach to low intermittent suction.