Vidalista 40 mg is a medication that can treat impotence and erectile dysfunction in men. This medication's ingredient, tadalafil, helps to increase blood flow to a man's penile tissues. Take this drug 30 minutes before engaging in any sexual activity. The effects of this drug take 36 hours to manifest. This medication's effectiveness will be reduced if it is taken with cold beverages or fatty meals. You can take this medication with or without food. You should take this medication as directed by your doctor.