Male erectile dysfunction and pulmonary arterial hypertension are treated with Vidalista 20 mg. It helps men achieve an erection by increasing blood flow to the penis. In PAH, it expands or relaxes the pulmonary blood vessels, lowering lung blood pressure. You can take Vidalista 20 mg with or without food. It must be taken exactly as prescribed by your physician. Only when you are sexually stimulated will the ED medication help you achieve an erection. Each person has a different time frame for working, but it often takes 30 to 60 minutes.