What factors prevent prescription substitution? Check all that apply.The brand name drug is available.There are no appropriate "A" code drugs.The drug company prefers to sell the brand-name drug.The prescription states DAW.The patient wants to save money.

Substitution is prevented when there is no appropriate “A”-rated drug to use as a therapeutically equivalent alternative, or when the prescriber marks the prescription “DAW” (dispense as written). The brand-name drug simply being available does not prevent substitution, and the drug company’s preference does not determine whether a pharmacist may substitute. A patient’s wish to save money may favor substitution rather than prevent it.

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