Erex 100 mg contains sildenafil citrate (100 mg) as it's main active salt which is used for the treatment of erectile dysfunction in men.This medicine contains a strong dosage of sildenafil which makes it an effective one but if you have just started or you are thinking about it then you must start with some lower dosage.Ed occurs due to many reasons like physical or psychological reasons are there.But we have the solution for it so why not.Erex 100 mg helps you to make your intercourse more satisfactory than before and even it benefits you with the long lasting effects.