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Fluoroquinolones are the antibiotic class most commonly linked to tendon-related side effects, such as tendinopathy and even tendon rupture. This risk can occur during treatment or shortly after it ends, and it tends to be higher in older adults, people taking corticosteroids, and those with certain health issues like kidney disease.

The underlying idea is that fluoroquinolones may disrupt collagen turnover and the integrity of the tendon matrix. They can affect the cells and extracellular structures that maintain tendon strength, making tendons more susceptible to inflammation and rupture under normal or increased stress.

In practice, if a patient develops tendon pain, swelling, or weakness while on a fluoroquinolone, the drug should be stopped promptly and an alternative antibiotic should be considered. The pain may occur in any tendon but the Achilles tendon is commonly affected. Early recognition and discontinuation help prevent a possible rupture, which may require surgical repair.

Other antibiotic classes—macrolides, cephalosporins, and carbapenems—do not have tendon toxicity as a prominent or typical adverse effect profile, though they have their own known risks (such as GI upset or allergies).