Based on this plan, safety information has been included in the summary of product characteristics and the package leaflet for Viagra, including the appropriate precautions to be followed by healthcare professionals and patients. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. The logo is clickable and will appear on the sites of all online medicine retailers in the EU that are registered with their national regulatory authority. Why has Viagra been approved? It lasts 4 to 5 hours, or longer if you have mild to moderate ED.Table of contents. In the European Union (EU), it is possible to buy medicines online. Patients should only buy medicines from online retailers registered with the national . # 1 roco Guest Posts: n/a Prescription drugs – can you buy them WITHOUT a prescription in Italy? All I would like is the sleeping pill mentioned on a thread to take on the long . Tadalafil (Cialis). This medication is taken with or without food an hour before sex. It works for up to 36 hours. You can take it in a small dose daily or in a larger dose as needed. .