Cialis (tadalafil) is a prescription medication often used for the treatment of erectile dysfunction. It is not intended to cure the condition and will be efficient only for as long as you take it. This means that every time you need to have sex and are unable to because of some physical or psychological factors, you will need to take Cialis. It's important that you do not take Cialis more often than every 24 hours, although with the period of efficiency this medicine displays (up to 36 hours) you probably won't need to anyway. Once you have purchased Cialis do not share it with anyone and make sure people in your household do not have access to it. Cialis can be dangerous if misused and if there is an overdose, the following symptoms are possible: back pain, indigestion, flushing, heartburn, stuffy or runny nose, headache, and priapism (an abnormally long and painful erection that can cause damage to the tissues of the penis). Please make sure you discuss your full medical history with the doctor prescribing Cialis, and you specifically mention any of the following health conditions: diseases affecting the shape of the penis, low blood pressure, irregular heartbeat, diabetes, bleeding disorder, stroke, ulcers, high blood pressure, high cholesterol, liver, kidney, or heart disease, heart attack, blood cell problems, and chest pain. Women are not supposed to be taking this medication. Cialis has been classified as FDA pregnancy category B, which means that it is not expected to do any harm to the unborn baby if taken by a pregnant woman. However, the effects of Cialis in breastfeeding babies have not been studies properly, and there is a chance Cialis may pass into breast milk. If you think you need to take Cialis and are currently pregnant or breastfeeding, talk to your doctor about it in advance.