Viagra is a brand name of sildenafil citrate – medicine prescribed to millions of men in the world to deal with impotence. Erectile dysfunction can be described as a complete or inconsistent ability to achieve an erection causing difficulties in personal life. You will feel the effects of this medicine within 30 minutes after taking it and can have sex any moment during the next 2 to 4 hours. Generally, the effects of this drug start to decrease after a couple of hours, so it’s recommended to take Viagra half an hour before you are planning to actually have sex.

During a series of studies aimed at establishing how effective Viagra can be in men of different age and health condition this medicine proved efficient in 90% of all cases – the best result ever demonstrated. Considering the insignificant and mild side effects reported by patients and the convenience of taking one pill when it is necessary makes this medicine very popular with men diagnosed with erectile dysfunction. Do not take Viagra more than once a day. At least 24 hours should pass between the two doses to provide for safety and efficiency.