What is the meaning of "ss" in medical prescriptions?

The term "ss" in medical prescriptions is an abbreviation derived from the Latin phrase "semis," which translates to "one half." This indicates that the prescribed dose is to be taken as half of a specified amount. It's a common notation used in pharmacy and clinical settings to clearly communicate dosing instructions to patients and healthcare providers. Understanding this abbreviation is crucial for accurately interpreting prescriptions and ensuring patient safety, as it affects the quantity of medication a patient is instructed to take.