Levofloxacin-induced bilateral Achilles tendonitis.

Area of Science:

• Pharmacology
• Orthopedics
• Infectious Diseases

Background:

• Fluoroquinolone antibiotics, including levofloxacin, are widely used for bacterial infections.
• Tendon-related adverse events are known but rare complications associated with fluoroquinolone use.
• Postmarketing surveillance is crucial for identifying rare adverse effects not detected in premarketing trials.

Observation:

• An 83-year-old woman developed bilateral Achilles tendonitis three days into a ten-day course of levofloxacin for pneumonia.
• Adverse effects, including nausea and dizziness, began during treatment, with tendonitis symptoms peaking four days after completion.
• The patient showed marked improvement with conservative management (immobilizer, rest) but had not fully resolved symptoms at three weeks.

Findings:

• This is the first reported case of levofloxacin-induced bilateral Achilles tendonitis in the medical literature.
• While not reported in clinical trials, postmarketing surveillance has received reports of similar adverse events to the manufacturer.
• The temporal association suggests a possible causal link between levofloxacin and the development of tendonitis.

Implications:

• This case underscores the importance of considering tendonitis as a potential adverse effect of levofloxacin, even in the absence of prior reports.
• Clinicians should be vigilant for tendon-related symptoms in patients treated with levofloxacin and other fluoroquinolones.
• Further postmarketing data is essential to clarify the true incidence and risk factors for levofloxacin-associated tendonitis and rupture.