Anaphylaxis, hypersensitivity
Phototoxicity
C. difficile diarrhea
Seizures
Depression / suicidal ideation
Torsades de Pointes
Vasculitis
Renal toxicity
Hepatic toxicity
Tendon rupture/tendinitis (black box warning, inc aged 60+/immunosuppressed/corticosteroid use)
Myasthenia exacerbation
Severe Hypoglycemia 
Nausea/vomiting, diarrhea, constipation, abdominal pain
Headache
Insomnia
Dizziness
Tendinitis
Levofloxacin
Azithromycin
Telithromycin
Cefepime
Moxifloxacin
Meropenem
Amoxicillin
Ceftriaxone