direction, prescript, medical recipe, formula, prescribed remedy; see also medicine 2.

Abbreviations commonly used in writing prescriptions include: aa (of each), a.c. (before meals), ad lib (freely as desired), aq. (water), b.i.d. (twice a day), c. (with), caps. (capsule), dil. (dilute), elix. (elixir), ext. (extract), fld. (fluid), g (gram), gr (grain), gt (a drop), gtt (drops), h (hour), noct. (in the night), O (pint), ol. (oil), os (mouth), oz (ounce), p.c. (after meals), per (through or by), pil. (pill), p.r.n. (when required), q.d. (every day), q.h. (every hour), q.2 h. (every 2 hours), q.3 h. (every three hours), q.4 h. (every four hours), q.i.d (four times a day), Sig. (write on label), sp. (spirits), ss (a half), stat (immediately), syr. (syrup), t.i.d (three times a day), ung. (ointment).