Taking tadalafil may cause neurological or gastrointestinal system reactions, such as dizziness, headache, diarrhea and other symptoms, and some people may experience flushing sexual dysfunction and other hazards. Tadalafil is a drug used to treat erectile dysfunction in men, usually half an hour to an hour or so before sex to take the drug, usually need to be sexually stimulated, in order to play the effect of the drug, is taking nitrate drugs prohibited from taking the crowd. Eating tadalafil may cause neurological or gastrointestinal system reaction, may appear dizziness, headache, diarrhea and other symptoms, some people may appear flushing, blurred vision and other symptoms, usually the symptoms are not obvious will disappear on their own, if you take a long time and large doses may appear abnormal erection, serious may lead to permanent inability to get an erection. Drugs should be taken correctly under the guidance of a doctor to avoid damage to the body.