A nurse is teaching a new nursing student about administering ivermectin to a client with a roundworm infection. Which instruction should the nurse emphasize to ensure safe and effective medication administration?

A. This statement is incorrect because ivermectin is absorbed more effectively when taken with food, particularly a light meal. Taking the medication on an empty stomach may reduce absorption and decrease its effectiveness in treating roundworm infections. Additionally, taking it without food can increase the likelihood of gastrointestinal discomfort. B. This statement is inaccurate. Ivermectin is designed to be administered orally as a tablet or liquid suspension, not sublingually. Sublingual administration is not appropriate and does not align with pharmacokinetic recommendations for this drug. C. While general safety measures regarding dizziness can apply to some medications, dizziness is not a common or clinically significant side effect of ivermectin. Advising the client to rise slowly is unnecessary and does not directly contribute to the safe or effective administration of this medication. D. This is the correct instruction. Taking ivermectin with food, especially a light meal, enhances absorption and helps minimize gastrointestinal side effects such as nausea, abdominal discomfort, or diarrhea. Proper administration with food ensures that therapeutic drug levels are reached and maintained, which improves the effectiveness of treatment for roundworm infections. This instruction also promotes client adherence, as gastrointestinal discomfort is a common reason clients may skip or discontinue the medication.