Keep out of the reach of children. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Do not use more of it and do not use it more often than your doctor ordered. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. Both options require valid medical documentation, but some online services only require a health questionnaire to be filled out and reviewed for approval—meaning no face-to-face video interaction is needed. Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial. · Sildenafil is used to treat men who have erectile dysfunction (also called sexual impotence). Sildenafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The penis is one of the areas where this enzyme works. · For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before sexual intercourse. Alternatively, the medicine may be taken 30 minutes to 4 hours before sexual intercourse. Your doctor may adjust your dose if needed. Our lowest price per pill £ This is the highest dose of Viagra. Viagra mg is the most effective dosage, but it also has the greatest risk of side effects. You may want to try Viagra mg if the standard 50mg dose didn’t work well enough for you, but you didn’t get any serious side effects.