malegra is for erectile dysfunction can be taken by men aged 18 and over. The most generally prescribed sildenafil dosage is 50mg. If you are using sildenafil for the first time, it is very probable that you will be prescribed this dosage. You should take your sildenafil dose approximately one hour before you plan to have s*x. The typical starting dose is malegra 50mg taken once a day, about one hour before intercourse.