Do you need a prescription to buy Tadalafil? Tadalafil will make these symptoms less severe and reduce the chance that prostate surgery will be needed. Some examples of these drugs include nitroglycerin, amyl nitrate, doxazosin, erythromycin, ketoconazole, rifampin, riociguat, ritonavir, tamsulosin, itraconazole, and poppers. When taken in this way over time, you may find an increased ability to achieve an erection anytime you experience sexual stimulation. It’s a good idea to avoid eating or drinking grapefruit for 72 hours before taking tadalafil.Compare prices and print coupons for Tadalafil (Cialis) (Generic Cialis) and other drugs at CVS, Walgreens, and other pharmacies. Prices start at $ Welcome! Buy Tadalafil online. Tadalafil is a generic, more affordable version of Cialis. It’s the same drug, just without the branding. Together, we’ll help you find the ED treatment that’s best for you. Talk to us to get advice from our experts and order Tadalafil online. Tadalafil: essential info. How to take Tadalafil. Tadalafil may be available through a mail-order pharmacy. Using this type of service may help lower the drug’s cost and allow a person to receive their medication without leaving home.