Suhagra 100 is used to treat men suffering from erectile dysfunction. The drug contains an ingredient called Sildenafil Citrate, which works to relax the muscles by increasing blood circulation in the penile arteries. Men above 18 years of age should take this medicine only on the doctor's advice. This medicine can be taken before or after food. This medicine should be taken only once a day. The effect of this medicine lasts for about 36 hours. Cold drinks or alcohol should not be consumed while taking this medicine as its side effects can be seen on your body.