Side effects of generic Arimidex may include constipation, diarrhea, nausea, vomiting, upset stomach, loss of appetite, body aches and pains, breast swelling/tenderness/pain, headache, dry mouth, scratchy throat, increased cough, dizziness, trouble sleeping, tiredness/weakness, flushing and sweating (hot flashes/hot flushes), vaginal bleeding, hair thinning, weight change, mental/mood changes (e.g., depression), numbness/tingling/swelling of the hands or feet, persistent cough, unusual vaginal discharge/burning/itching/odor, unusually stiff muscles, pain/redness/swelling of the arms or legs, vision changes, bone pain, bone fracture, signs of infection (e.g., fever, chills, persistent sore throat), chest pain, jaw/left arm pain, trouble breathing, confusion, fainting, slurred speech, weakness on one side of the body.