Which of the following is required information on a prescription label?

The requirement for certain information on a prescription label is guided by federal and state regulations to ensure safe and effective medication usage. One critical piece of information that must be included on a prescription label is the quantity dispensed. This detail is essential for the patient to know how much medication they have received, which is vital for adherence to the prescribed treatment plan and for preventing the risk of taking too much or too little.

Including the quantity dispensed allows the patient to manage their medication effectively and to understand the duration for which their prescription will last. It also aids in case of questions regarding medication refills and helps pharmacists monitor medication use more accurately.

In contrast, while other pieces of information such as a patient’s social security number, a pharmacist's signature, or the amount paid by the patient might be relevant in specific contexts, they do not necessarily have to be included on every prescription label. The focus is placed on the information that directly affects medication use and patient safety, making the quantity dispensed a fundamental element of the prescription label.