Fluoroquinolone-Associated Myoclonus and Jerking Movements

Introduction to Fluoroquinolone-Associated Neurological Effects

Fluoroquinolones can cause a variety of muscle syndromes ranging from mild myalgias to severe manifestations including myoclonus and jerking movements 1, 2
These neurological adverse effects typically manifest within one week after starting fluoroquinolone treatment 3
Symptoms often resolve within 1-4 weeks after discontinuation of the medication, though some cases have persisted for up to 6 months 3
The fluorine atom in fluoroquinolones is thought to be a key trigger for these muscle disorders 2

Pre-existing muscular anomalies or myopathic processes increase the risk of developing myoclonus with fluoroquinolones 3, 4
Concurrent use of statins significantly increases the risk of muscle-related adverse effects 3, 4
Renal disease or impairment, advanced age, and history of malignant hyperthermia susceptibility are also risk factors 2, 4
Use alternative antibiotics in patients with risk factors when possible 4
Avoid concomitant corticosteroid administration with fluoroquinolones 4, 6
Limit high-intensity physical activity during fluoroquinolone treatment 5, 6
Consider magnesium supplementation during treatment 4

Symptoms typically consist of diffuse muscle pain with or without weakness 3
There may be a predilection for proximal muscle groups 3
Immediately discontinue the fluoroquinolone if myoclonus or other muscle symptoms develop 4, 5
Protect the affected area to limit further injury 5, 6
Myoclonus may persist for weeks to months after discontinuation of the fluoroquinolone 3
Patients taking both fluoroquinolones and statins should be monitored particularly closely for muscle-related adverse effects 3, 4