NBME Form 27 Practice Test

Fluoroquinolones are known to be associated with an increased risk of tendon rupture and tendinopathy, particularly involving the Achilles tendon. This risk is particularly heightened in certain populations, such as older adults, those who are concurrently using corticosteroids, and individuals with pre-existing tendon disorders. The mechanism behind this adverse effect is believed to involve damage to the extracellular matrix of tendons, leading to weakness and increased susceptibility to injury.

In contrast, the other antibiotic classes mentioned—macrolides, penicillins, and tetracyclines—do not carry a similar risk of tendon injury. Macrolides are primarily known for their respiratory tract effectiveness and their side effects are generally related to gastrointestinal disturbances or cardiotoxicity. Penicillins are widely used for bacterial infections and have a different side effect profile focused more on allergic reactions. Tetracyclines are effective for certain types of infections but are also linked to different side effects, such as photosensitivity and discoloration of teeth, rather than tendon damage.

Thus, the distinct association of fluoroquinolones with tendon injuries makes them a critical consideration in patient management, particularly for those who may be at elevated risk.