Final answer:
The nurse should discontinue the medication as per protocol. Symptoms described by the client indicate a possible adverse reaction to the betamimetic therapy.
Step-by-step explanation:
The nurse should discontinue the medication as per protocol. The symptoms described by the client, including muscle tremors, signs of nervousness, and a racing heart, indicate a possible adverse reaction to the betamimetic (tocolytic) therapy. Discontinuing the medication is necessary to ensure the client's safety and prevent further complications.
It is important to note that a high heart rate (>100 beats per minute) and symptoms of nervousness are not expected side effects of betamimetic therapy. Therefore, option D, reassuring the client that these are expected side effects of the medication, is not appropriate.