Which of the following is not a common side effect of osteoporosis medications?

Weight gain is not a common side effect of osteoporosis medications. Osteoporosis treatments typically focus on improving bone density and strength, and while they can have various side effects, these often include gastrointestinal issues, musculoskeletal pain, and sometimes allergic reactions, but not weight gain.

In contrast, other options such as rash, flushing, and swelling can be more readily associated with certain osteoporosis medications. For example, some patients may experience skin reactions like rashes due to the body’s response to the medication. Flushing may occur, particularly with medications that impact blood flow or cause alterations in vascular function. Swelling can arise as a side effect of certain types of medications that affect fluid retention or can be linked to allergic reactions or inflammatory responses.

Therefore, while all medications can present a range of side effects, weight gain is not typically recognized as one related to osteoporosis treatment, making it the correct choice among the provided options.