Hello dear I understand your concern Yes you can take viagra. But it should be taken after proper evaluation by urologist and after finding the cause of premature ejaculation. Your problem could be due to psychological issue like anxiety, depression, stress, marital disharmony and medical cause like low testosterone, diabetes, hypertension, obesity, back nerve problem, excessive alcohol and smoking. First you can go for the blood tests like blood sugar, lipid profile, serum testosterone, and complete health check up. If all normal then problem mostly due to psychological problem. Following advises will help you Avoid sex when you feel stress and ftigue Do purposefully masturbation before sex Use double condom and apply lidocaine gel Try women on top position Do kegel s pelvic exercise Talk the problem to your partner Do regualr exercise in morning like walking, running and followed by yoga Take healthy diet with lots of fruits and green leafy vegetables If problem persists then viagra and paroxetine 30-40 minutes before sex will useful Hope this may help you Contact further if follow up needed Best regards Dr. Saagar