Who would have thought there is no real answer as to where Rx came from. The most common theory is that Rx is an abbreviation for the Latin word for ‘recipere’ which means ‘to take’ or to take thou. This symbol originated in medieval manuscripts as an abbreviation
Px is the symbol meaning prescription which is sometimes transliterated as Rx.
Lots of theories about the origin
#1- Came from the Eye of Horus. 5,000 years ago in Egypt the people prayed to Horus and used the eye of Horus to protect them against disease, suffering and evil. The eye was displayed on buildings and painted on papyrus rolls used for writing about medicine and doctors.
Horus is commonly known as the father of Pharmancy. The pharmaceutical symbol used to be an EYE with an “x” below it instead of the “R
#2- From the Latin word Recipere
#3- Devils, Drugs and Doctors written in 1931 ’Rx is not, as is frequently supposed, an abbreviation of a Latin word meaning recipe or compound, but is an invocation to Jupiter, a prayer for his aid to make the treatment effective..’Derived from the astrological sign for Jupiter which was once placed on prescriptions to invoke that god’s blessing on the drug to help the patient recover. It was used in early Europe doctors and alchemists used to to show the sign of good protection.