Anaphylaxis
Seizure
Phototoxicity
Superinfection
Increased ICP
Toxic psychosis
Vasculitis
Serum sickness
Hypersensitivity pneumonitis
QT prolongation
Torsades de pointes
Peripheral neuropathy
Hepatotoxicity
Nephrotoxicity
Crystalluria
Myelosuppression
Blood dyscrasias
Tendonitis or tendon rupture (black box warning) - increased risk in age >60, immunosuppressed, corticosteroid use
Myasthenia exacerbation
Severe Hypoglycemia 
mental health effects
Nausea/vomiting
Diarrhea
Abnormal ECG
Headache
Dyspepsia
Dizziness
Vaginitis
Insomnia
Photosensitivity
Pruritus
Anxiety
Agitation
Tendinitis
Elevated LFTs
Ofloxacin
Gatifloxacin
Ciprofloxacin
Fosfomycin
Meropenem
Gemifloxacin
Linezolid
Moxifloxacin