Do not drink alcohol in excess. side effects may include headache, upset stomach, delayed backache or muscle ache. to avoid long term injury, get medical help right away for an erection lasting more than four hours. if you have any sudden decrease or loss in hearing or vision or any allergic reactions like rash, hives swelling of the lips tongue or throat or difficulty breathing or swallowing, stop taking cialis and get medical help right away. ask your doctor about cialis for daily use and a free 30-tablet trial. americans drink 48 billion bottles of water every year. that's enough plastic bo...