All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. Erectile dysfunction medications require a prescription from a licensed provider. These include a heart attack, stroke or a serious heart rhythm disorder in the past six months. In some cases, ED can cause a strain on relationships and impact self-esteem. Read our editorial process. It’s best to check your chosen provider’s site for more information.When samples of milligram Viagra tablets purchased online were tested, only 10% were even close to the advertised strength. When you buy from an unknown company, . You do not have to buy it in Poland as they are often the same brands- for example Nurofen Plus and Solpadeine are international brands, OTC in both Poland and UK. . Viagra is available off-script in Poland, too. In Britain, it’s available through a partial switch, although a full switch is being considered.