The FDA’s definition of “Rx only” / “prescription only” is (approximately) “for provision and use only at a licensed physician’s direction and under medical supervision”.

Why is prescription called Rx?

According to most sources, Rx is derived from the Latin word “recipe,” meaning “take.” Among several alternative theories, however, is the belief that the Rx symbol evolved from the Eye of Horus, an ancient Egyptian symbol associated with healing powers.

Can Rx mean treatment?

re´cipe (take); prescription; treatment.