the moment's right. day or night. >> tell your doctor about your medical condition and all medications and ask if you're healthy enough for sexual activity. >> don't take cialis if you take nitrates for chest pain, as this may cause an unsafe drop in blood pressure. >> don't drink alcohol in excess with cialis. side effects may include headache, upset stomach, delayed backache, or muscle ache. to avoid long-term injury, seek immediate medical help for an erection lasting more than 4 hours. >> if you have any sudden decrease or loss in hearing or vision, stop taking cialis and call your doctor right away. >> 36-hour cialis or cialis for daily use. ask your doctor if cialis is right for you. you can be ready for your moment with cialis.