Final answer:
The nurse would expect the prescriber to continue the current dosage for 4 more weeks.
Step-by-step explanation:
In this case, since the patient has experienced a 3% weight loss since beginning the medication, the nurse would expect the prescriber to continue the current dosage for 4 more weeks. This is because a 3% weight loss is considered a clinically significant response to the medication. Discontinuing the drug or increasing the dosage to another nonamphetamine agent would not be necessary at this point.