Viagra 100mg works by increasing blood flow to the penis which helps men to get or maintain an erection. It is a prescription medicine used to treat erectile dysfunction in men that belongs to a group of medicines known as phosphor di-esterase type 5 inhibitors. It allows the blood to flow into the penis when the person is sexually excited and helps to treat erectile dysfunction. Viagra relaxes the blood vessels and increases the blood supply to the lungs and reduces the workload of the heart.

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