Final answer:
The nurse should teach the client about Phentermine (Mirapront) as the prescribed anorexiant medication, as other options mentioned have been either withdrawn from the market or are not anorexiants.
Step-by-step explanation:
The nurse should expect to teach the morbidly obese client about Phentermine (Mirapront) as their prescribed anorexiant medication. Sibutramine (Meridia) and Dexfenfluramine (Redux) have been removed from the U.S. market due to safety concerns, and Pemoline (Cylert) is not an anorexiant but rather a medication that was used to treat ADHD and is also no longer available in the U.S. due to its potential for serious side effects. Phentermine is a stimulant similar to an amphetamine and is often used in combination with diet and exercise to treat obesity, particularly in those with risk factors such as high blood pressure, high cholesterol, or diabetes.