s.o.s., si op. sit means si opus sit - if there is a need in
Prescription
Similar to s.o.s., si op. sit
NS - normal saline
0.9%
o.p.d. - once per day
o.s. - oculus sinister - left eye
o.u. - oculus uterque - both eyes
od - oculus dexter - right eye
od - omne in die - every day/once daily
preferred to qd in the UK[3]
om - omne mane - every morning
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