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PO stands for a Latin abbreviation that means "by mouth". So take the tablet; capsule; caplet by mouth. 1-2 day means take 1 or 2 a day
PRN is another abbreviation that stands for "as needed".
The prescription should also list PRN number of hours between doses, such as q. 4 hrs; q. 6 hrs.; q. 8 hrs. (q. means every).
Since this prescription as you copied it here does not list the hours, I would assume it means 12 hours in between doses.
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