Final answer:
A healthcare provider must write the brand name of the drug followed by 'Dispense as Written' (DAW) or 'Brand Medically Necessary' on the prescription to indicate that a specific brand drug is required.
Step-by-step explanation:
If a healthcare provider wants a patient to take a specific brand name drug, they need to indicate this preference on the prescription. The provider usually does this by writing the brand name of the drug followed by 'Dispense as Written' (DAW) or 'Brand Medically Necessary' on the prescription form. This instructs the pharmacist to dispense the exact brand specified, rather than a generic equivalent. Additionally, the provider may include the reason for brand-specific prescribing if it's necessary for the patient's treatment due to efficacy, allergy, or other clinical considerations.