In addition to adverse cardiovascular effects of quinidine, other adverse effects include:

• Central nervous system (CNS)—anticholinergic effects—vertigo, confusion, light-headedness, depression, delirium, headache, tinnitus, hearing loss, vision disturbances
• Respiratory—acute asthmatic attack, respiratory arrest
• Gastrointestinal (GI)—nausea, vomiting, diarrhea, abdominal pain, anorexia, hepatotoxicity
• Hematologic—hemolytic anemia, thrombocytopenia, anaphylaxis, or allergic reactions including rash
• Other—photosensitivity, angioedema.