How many refills are permitted on a testosterone prescription under federal law?

Under federal law, testosterone prescriptions fall under the Controlled Substances Act as a Schedule III controlled substance. For these prescriptions, the law permits a maximum of five refills within a six-month period from the date of the prescription. This is important because controlled substances have strict regulations surrounding their prescribing, dispensing, and refilling to prevent misuse and ensure patient safety.

In contrast, the options regarding a limited number of refills or unlimited refills do not apply to testosterone prescriptions. Therefore, the correct answer reflects the regulatory limits imposed by federal law specifically for Schedule III substances like testosterone.