Yunnan Jingo is the trade name, generic name of sildenafil tablets, the drug effect usually maintains 0.5 to 4 hours. Sildenafil tablets are drugs belonging to the treatment of erectile dysfunction of the penis, repeated state of oral 30 to 120 minutes, will reach the peak of blood concentration, can be taken 0.5 hours to 4 hours before sex. Sexual stimulation is required to achieve penile erection after the drug is administered, and the erectile response generally increases with the dose and concentration of sildenafil, and the effect of the drug can last up to 4 hours, but the response is weaker than that of 2 hours. Adverse reactions to the drug include nausea, vomiting, abdominal pain, dizziness, headache, and increased heart rate. It is prohibited for people who are allergic to the drug, and it is forbidden to take it while taking nitrate drugs. If you need to use the drug should be examined by a doctor first, under the guidance of the doctor to use the drug.