Malarone side effects that may occur while taking MALARONE include rash, nausea, diarrhea, headache, vomiting, fever, difficulty sleeping, stomach pain, mouth sores, or swelling or soreness of the mouth or tongue. If Malarone side effects continue or are bothersome, check with your doctor. CONTACT YOUR DOCTOR IMMEDIATELY if you experience Malarone side effects like loss of appetite, weight loss, unusual fatigue, dizziness, severe vomiting or diarrhea, fever, muscle or back pains. Malarone side effects are UNLIKELY, but seek immediate medical attention if Malarone side effects occur. Symptoms of aMalarone side effects include rash, itching, swelling, severe dizziness, or trouble breathing. If you notice other Malarone side effects not listed above, contact your doctor, nurse, or pharmacist.