It might be a while before MED is available at your local pharmacy. ED can sometimes signal an underlying medical problem, like heart disease or diabetes , that needs to be treated separately. Especially tell your healthcare provider if you take any of the following: medicines called nitrates medicines called guanylate cyclase stimulators such as Adempas riociguat medicines called alpha-blockers, such as Hytrin terazosin HCl , Flomax tamsulosin HCl , Cardura doxazosin mesylate , Minipress prazosin HCl , Uroxatral alfuzosin HCl , Jalyn dutasteride and tamsulosin HCl , or Rapaflo silodosin. Patients should always ask their doctors for medical advice about adverse events. An OTC drug will help patients get treatment more quickly. The products discussed in this site may have different product labeling in different countries. But, keep in mind that ED might signal an underlying medical problem, like high blood pressure, heart disease, diabetes, low testosterone, or sleep apnea.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. Men will no longer require a prescription to obtain the impotence drug Viagra and will instead be able to buy it over the counter at pharmacies. The decision by the UK Medicines and Healthcare. Can I buy generic Viagra over the counter or do I need a prescription? In the U.S. and most other countries, generic Viagra is only available with a prescription.