Rx

 The "R" in "Rx" stands for the Latin word recipe, meaning "take," and the first doctor to use "Rx" used it as a verb with the same meaning, "Rx two aspirin" being equivalent to today's "Take two aspirin. ~ Merriam-Webster.  it is like saying an apple a day keeps the doctor away. a serpent in a branch of Life. or the root of taking,