Which of the following drugs is a bisphosphonate?

• A. Risedronate (Actonel)
• B. Alendronate (Fosamax)
• C. Calcitonin
• D. Teriparatide

Answer: (B)

Risedronate (Actonel) and Alendronate (Fosamax) are both bisphosphonates, which are a class of drugs commonly used to treat osteoporosis and other conditions that involve bone loss. The primary mechanism of action for bisphosphonates is to inhibit osteoclast-mediated bone resorption, which helps to maintain or increase bone density.

In this case, while Alendronate is the selected answer, it's important to note that Risedronate, as well, falls under the category of bisphosphonates. However, since the emphasis is specifically on Alendronate in this answer, it is essential to understand its role and effectiveness in managing bone density. Alendronate is administered orally and is recommended for individuals who are at risk for fractures due to osteoporosis, as it helps improve bone strength.

Calcitonin and Teriparatide, on the other hand, represent different classes of medications. Calcitonin is a hormone involved in calcium regulation and is used for osteoporosis but does not act as a bisphosphonate. Teriparatide is a synthetic form of parathyroid hormone that stimulates bone formation rather than inhibiting resorption, distinguishing it from the bis