When is zoledronic acid preferred over oral bisphosphonates?

• A. When patient insists on daily pills
• B. When annual IV dosing is preferred or adherence is a concern
• C. When IV therapy is contraindicated
• D. When avoiding hypocalcemia risk

Answer: (B)

The key idea is that zoledronic acid is given as an IV infusion once a year, making it especially useful when a patient benefits from a very infrequent dosing schedule or has difficulty sticking with daily or weekly oral pills. This IV, annual dosing bypasses the adherence challenges and GI tolerability issues that can come with oral bisphosphonates, so it’s chosen to improve consistency of treatment in those circumstances. It isn’t preferred when IV therapy is contraindicated, and it doesn’t specifically reduce hypocalcemia risk compared with oral forms—both can affect calcium levels, so that’s not the driving factor.