GI (most common): diarrhea 5%, nausea 4%, abdominal pain 3%, vomiting 1%, dyspepsia, flatulence, constipation, hyptertrophic pyloric stenosis in neonates
Skin: Rash, puritis, photosensitivity, angioedema. erythema multiforme, Stevens-Johnson, toxic epidermal necrolysis, DRESS
CNS: headache, dizzines, fatigue, exacerbation of myasthenia gravis
Hepatotoxicity
Heart: QT prolongation and arrhythmias
Hearing: hearing loss and tinnitus
Psychiatric- anxiety, aggression