What is a common long-term complication of antiseizure drug therapy related to bone health?

• A. Osteoporosis or osteopenia
• B. Hypercalcemia
• C. Muscle hypertrophy
• D. Increased bone density

Answer: (A)

Long-term antiseizure drug therapy often affects bone health by lowering bone mineral density, which can lead to osteoporosis or osteopenia. Some antiseizure medications are enzyme inducers that increase vitamin D metabolism in the liver, reducing calcium absorption from the gut. With less calcium available, the body’s bone remodeling shifts toward resorption, weakening bones over time and raising fracture risk. This pattern fits the common bone-health complication seen with chronic antiseizure use. Hypercalcemia, muscle hypertrophy, or increased bone density do not align with this outcome—hypercalcemia implies too much calcium, muscle changes aren’t the primary issue, and increased bone density would indicate stronger bones rather than a degenerative change. Clinically, clinicians monitor bone density, encourage vitamin D and calcium intake, promote weight-bearing exercise, and may choose non–enzyme-inducing antiseizure options when possible to mitigate risk.