RX Fast
“Rx” is commonly used as an abbreviation for “prescription”. It can also refer to a medical prescription, the instruction on a medication label, the symbol for prescription drugs, or the Rx key on a keyboard. In the context of “rx fast”, it’s possible that you’re looking for information on a medication or product that can be obtained with a prescription, and that is supposed to work quickly. Without more information, it’s difficult for me to give you a specific answer.