Which of the following can be changed on a C-II prescription?

The option that is appropriate to change on a C-II prescription is the dosage form. In situations where a patient may need a medication in different formulations (such as switching from a tablet to a liquid), the dosage form can be modified with the prescriber's approval.

On the other hand, changing the patient’s name, the medication prescribed, or the prescriber's signature on a C-II prescription is prohibited due to strict regulations governing controlled substances. This regulation is in place to ensure the integrity and accuracy of the prescription and to prevent misuse or fraud. Hence, while there may be flexibility with the dosage form, any alterations affecting the identity of the patient or the medication itself, or forgery of a prescriber’s signature, remain strictly controlled under law.