See the full range that we carry above. The most common cause of ED is reduced blood flow to the penis and Viagra works by increasing that blood flow, so that there is enough to achieve and maintain a firm erection. You can take it up to 4 hours before you want to have sex. Please expect up to 4 to 6 weeks for reimbursement. Brand names Why is this medication prescribed?Viagra Connect is the first over-the-counter erectile dysfunction treatment, and you can buy it legally online. Viagra Connect is effective for 74% of men, and can help you to get an erection within an hour of taking it. Viagra Connect works in the same way as Viagra, but it is only available at a 50mg dose. Use our online assessment to order. The PDE5-inhibitors available in Ireland are: Viagra (active ingredient – sildenafil) – The oldest and best known PDE-5 inhibitor. You can also buy Sildenafil as a generic. Cialis . Sildenafil is an erectile dysfunction (ED) medication. It’s the generic version of the medicine Viagra, meaning it contains the same active ingredient. Pack size. Prescription for 24 .

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