Instructed patient on medication Amiodarone. This medication is used to stabilize the rhythm of your heart. Amiodarone is used to treat ventricular tachycardia or ventricular fibrillation. Take this medication at the same time daily as directed. May take with or without food. Avoid grapefruit, St. John's wort, & sunlight or tanning beds. common side effects include: nausea, vomiting, loss of appetite; or constipation. Call your doctor or get medical help at once if you have: chest pain, fast or pounding heartbeats, trouble breathing, vision problems, upper stomach pain, vomiting, dark urine, jaundice (yellowing of the skin or eyes), or if you cough up blood. Tell your doctor if you have signs of a thyroid problem, such as weight changes, extreme tiredness, dry skin, thinning hair, feeling too hot or too cold, irregular menstrual periods, or swelling in your neck (goiter).