The active ingredient tadalafil is found in tadarise 20mg, which is an effective medicine for the treatment of men suffering from erectile dysfunction. Take tadarise 20 between 30 minutes to 1 hour of sexual intercourse. The effect of this medicine lasts for 36 hours. This medicine can be taken with or without food. Do not take tadarise tablet with heavy meals as it reduces the effect of this medicine. If you are taking nitrate medication, do not take any ED pills as the drug has serious side effects.