Risk of Fluoroquinolone Side Effects in Older Adults with Osteoarthritis
Specific Risk Factors
- The American College of Physicians recommends that patients over 60 years with osteoarthritis have a significantly elevated risk of developing fluoroquinolone-related side effects, particularly tendinopathy, with approximately 1 in 1638 patients in this age group experiencing Achilles tendon rupture when treated with fluoroquinolones 1, 2
- Age over 60 years places patients in a high-risk category, with studies showing that patients over 60 have a 4 times higher risk of Achilles tendon rupture compared to the general population 2, 3
- Osteoarthritis is specifically listed as a risk factor for fluoroquinolone-associated tendon disorders in clinical guidelines 1, 2
Types of Side Effects Most Likely to Occur
Tendon Disorders
- Current use of fluoroquinolones increases the risk of tendon disorders (odds ratio 1.7), tendon rupture (odds ratio 1.3), and specifically Achilles tendon rupture (odds ratio 4.1) 2, 4
- Symptoms typically occur within 1 week of exposure (median 6 days) but can appear as early as 2 hours after initial exposure or as late as 6 months after discontinuation 5, 6
- While the Achilles tendon is most commonly affected (90% of cases), other tendons may also be involved, including patellar tendon, rotator cuff, and various hand and foot tendons 5, 7
Risk Quantification
- The absolute increase in risk of Achilles tendon rupture is approximately 12 cases per 100,000 persons within 90 days of fluoroquinolone treatment 2
- The risk of Achilles tendon rupture within 90 days of exposure to fluoroquinolones is 3.1 times higher compared to the general population 2
- For persons older than 60 years, this risk increases to 4 times higher than the general population 2