Male sexual function problems (impotence, often known as erectile dysfunction or ED) are dealt with with sildenafil. When combined with sexual stimulation, sildenafil helps a man achieve and keep an erection by boosting blood flow to the penis. Sexually transmitted infections (such as syphilis, hepatitis B, gonorrhea, and HIV) are not prevented by this medicine. Use “safe sex” techniques, such as latex condoms. For more details, speak with your pharmacist or doctor.