Substitution between a combination drug product and its component single agents is permitted?

Substitution between a combination drug product and its component single agents is permitted?

• A. IS
• B. IS NOT
• C. ONLY WITH PRESCRIBER SIGNATURE
• D. SOMETIMES

Answer: (B)

The important idea here is that a fixed-dose combination product is dispensed as a single unit with a defined ratio of two active ingredients. Substituting that product with its separate component drugs would change the dose, release characteristics, and overall dosing regimen, creating a different product with potentially different safety and effectiveness. Because there isn’t a recognized therapeutic equivalence between the combination product and its individual components, this interchange is not permitted. In other words, you should dispense the exact combination product that was prescribed, and the prescriber’s authorization to substitute does not apply to this scenario.

The important idea here is that a fixed-dose combination product is dispensed as a single unit with a defined ratio of two active ingredients. Substituting that product with its separate component drugs would change the dose, release characteristics, and overall dosing regimen, creating a different product with potentially different safety and effectiveness. Because there isn’t a recognized therapeutic equivalence between the combination product and its individual components, this interchange is not permitted. In other words, you should dispense the exact combination product that was prescribed, and the prescriber’s authorization to substitute does not apply to this scenario.