The correct direction for a prescription label for the Sig:"2 gtt OU q4-6h p.

Sig Code Breakdown:

2 gtt = 2 drops

OU (oculus uterque) = both eyes

q4-6h = every 4 to 6 hours

p.r.n. = as needed

Why Other Options Are Incorrect:

A. Both ears?❌"AU" (auris uterque) means both ears, NOT both eyes.

B. Right ear?❌"AD" (auris dextra) means right ear.

C. Right eye?❌"OD" (oculus dexter) means right eye.

????Reference:PTCB Approved Sig Code List, ISMP Safe Prescription Writing Guidelines.