CommonSide Effects of Malarquine are Nausea, Abdominal pain, Blurred vision, Dizziness, Headache, Ringing in ear, Vomiting, Flushing (sense of warmth in the face, ears, neck and trunk), Diarrhea, Deafness, Sweating, Abnormal heart rhythm, Hearing loss, Visual impairment, Blindness.