Which statement is true regarding generic substitution?

The correct assertion regarding generic substitution is that patients have the right to refuse a generic medication. This reflects the rights of patients to be involved in their own healthcare decisions, including the choice between a brand-name drug and its generic equivalent. Patients may refuse a generic substitute based on various factors, such as concerns about the effectiveness or side effects of generics versus brand-name drugs.

The other statements do not hold up under current regulations. Physicians can indeed designate "Dispense As Written" (DAW) on electronic prescriptions to prevent generic substitution, reflecting their authority to endorse a specific brand if they have a preference based on medical judgement. Furthermore, when a brand-name drug is dispensed, it is a requirement for the manufacturer's name to be included on the label to ensure proper identification of the medication that was provided to the patient. Therefore, A stands out as the only true statement regarding generic substitution in this context.