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gr ss = gr 1/2 gr 1 = 60 mg therefore gr ss = 30 mgSo you would give 1 (30mg) tablet of codeine to fulfill the order of codeine gr ss
60 mg
--------
gr i
45 mg 15 mg
-------- --------
gr 3/4 gr 1/4
30 mg
gr 1/2
1 teaspoon is 77 gr (grain). So 125 gr is about 2 teaspoons.
gr = Grain
ss = 1/2
120 gr