What is the medical term x2?

The medical term "x2" is used to indicate that the dose or quantity of a drug or treatment is to be doubled. For example, a prescription might say "Take x2 tablets three times a day," meaning the patient is to take two tablets three times a day. Other multiplications used in medicinal notation are q.i.d. (meaning 4 times a day), and o.d. (meaning once a day).