Men with erectile dysfunction can be treated with the medication vidalista 20 mg.tadalafil, a component in this medication, aids in boosting blood flow to the penis. Men above the age of eighteen are prescribed this medication. Women and children should not use this medication; it should only be taken once daily. This medication takes about 30 minutes to take effect. This medication has a 36-hour half-life, so avoid taking it too often. Follow your doctor's advice when taking this medication.