Fluoroquinolone antibiotics, such as ciprofloxacin, can precipitate or worsen muscle weakness in patients with myasthenia gravis, potentially leading to respiratory failure.
Fluoroquinolones are contraindicated in active myasthenia gravis due to risk of crisis.
Even a single dose can trigger worsening; symptoms may appear within hours.
Monitor respiratory parameters (VC, negative inspiratory force) if exposure occurs.
Educate patients and caregivers to seek immediate medical attention for new or worsening weakness.
Fluoroquinolones antagonize nicotinic acetylcholine receptors at the neuromuscular junction, reducing the efficacy of acetylcholine transmission. In myasthenia gravis, where the number of functional receptors is already diminished, this additional blockade can markedly impair neuromuscular transmission.
Exacerbation of myasthenic symptoms (ptosis, diplopia, dysphagia, generalized weakness). Severe cases may progress to myasthenic crisis with respiratory muscle failure requiring mechanical ventilation. Onset can be rapid, within hours to a few days after drug initiation.
Avoid fluoroquinolones in patients with known myasthenia gravis. If use is unavoidable, monitor closely for any increase in weakness, check respiratory function (spirometry, vital capacity) frequently, and have a low threshold to discontinue the drug and provide supportive care. Consider alternative antibiotics (e.g., β‑lactams, macrolides) that lack neuromuscular blocking properties.
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