Viagra is the trade name, generic name sildenafil, sildenafil and dapoxetine have the condition needs, exclude contraindications can be used together. 1. Sildenafil: clinical mainly used for penile erectile dysfunction, adverse reactions include headache, flushing, dyspepsia, back pain, muscle pain, dizziness, rash. People who are allergic to the drug, prohibited from using it while taking nitrate drugs, have a history of heart disease, use with caution. 2. Dapoxetine: Clinical mainly used for 18 to 64 years old patients with premature ejaculation, can effectively prolong the ejaculatory latency. Adverse reactions include headache, dizziness, nausea, diarrhea, insomnia, fatigue and so on. Contraindications mainly include those who are allergic to the drug are prohibited from using it, patients with heart block and myocardial ischemia are prohibited from using it, and it is prohibited from being used in patients with moderate and severe liver injury. If you suffer from erectile dysfunction as well as premature ejaculation and other symptoms, you can use it at the same time under the guidance of a doctor, but you should avoid blindly abusing the drug yourself.