You’ll also need to fill out a medical questionnaire with answers about your medical history, current medications, and lifestyle habits. Ritonavir mg b. In some cases, online ED providers accept health insurance. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. General: In humans, vardenafil alone in doses up to 20 mg does not prolong the bleeding time.Not offered. £ (£ per pill) Tesco doesn’t offer an online Viagra service. Since they both have pharmacy stores, Tesco may be able to fill Viagra prescriptions in person but do not list prices online. Superdrug Online Doctor – our online Viagra service starts from £ including free delivery, or click and collect. No, vardenafil isn’t available over the counter (OTC). This is because it has some risks, like low blood pressure and painful erection, that your provider will want to discuss with you. Other risks might depend on the medical conditions you have and the medications you’re currently taking. Vardenafil (Levitra) is almost 10 times more biochemically potent than sildenafil, therefore a lower dose is needed to facilitate the penile erection, potentially resulting in less side effects. Selectivity is the ability of the drug to attach to the specific enzyme PDE 5 found in penile tissues. Vardenafil (Levitra) is more selective than.