What it means
A frequency used in prescriptions in the United Kingdom, Australia and other countries. US orders write BID for the same thing. It means two doses a day, usually about 12 hours apart.
For the nurse
If an order uses a short form you do not recognize, ask before giving the drug. Writing "twice daily" in full avoids confusion.
Related terms
PRN
As needed: an order for a drug or treatment to be given only when the client needs it, within set limits.
every 2 hours
At two-hour intervals, around the clock unless the order says otherwise; written q2h.