Similar to o.p.d.

μg - microgram
1/2NS - half normal saline 0.45%
a.c. - ante cibum - before meals
a.d. - auris dextra - right ear
a.l., a.s. - auris laeva, auris sinistra - left ear
a.m. - ante meridiem - morning, before noon
A.T.C. - around the clock

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