[Fluoroquinolone associated myasthenia gravis exacerbation: clinical analysis of 9 cases].

Objective To explore the characteristics of acute exacerbations of myasthenia gravis after fluoroquinolone exposure. Methods Gender, age, prior type, absolute score, concurrent disease, precipitated disease, use of antibiotic, onset/symptom/degree of exacerbation, therapeutic measures and prognosis at Month 1 were retrospectively analyzed for 9 patients after fluoroquinolone systemic exposure.Results Ciprofloxacin (n=4), levofloxacin (n=1) and moxifloxacin (n=4) exposure resulted in myasthenia gravis exacerbation.Myasthenia gravis exacerbations developed at 15 minutes to 4 days post-exposure.And the clinical scores of quantitative myasthenia gravis (QMG) increased by an average of 10.The main syndromes included dyspnea, diplopia, ptosis and dysphagia.All patients improved upon the withdrawal of fluoroquinolone in conjunctions with other interventions. Conclusion Fluoroquinolone exposure may result in myasthenia gravis exacerbations in patients with underlying diseases.Healthcare professionals should be aware of this serious drug-disease association. Key words: Myasthenia gravis; Fluoroquinolone; Ciprofloxacin; Levofloxacin;  Moxifloxacin