What is the instruction for instilling drops if the dosage is 1 drop?

Instilling 1 drop is the correct instruction because it aligns with the prescribed dosage, which is specifically stated as 1 drop. This precise dosage is critical, especially in medication administration, where giving the right amount can impact the effectiveness of the treatment and the safety of the patient.

Instilling more than the prescribed 1 drop, as suggested by the other choices, can lead to excess medication being introduced, which may increase the risk of side effects or adverse reactions. Moreover, in many cases, especially with eye or ear drops, using too many drops can also lead to waste or leakage, resulting in insufficient dosing being absorbed by the body. Therefore, adhering to the exact dosage of 1 drop ensures that the medication is administered correctly and safely.