Just visit a participating pharmacy. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Those with pre-existing conditions should always consult a healthcare provider before taking new medications or supplements. People taking nitrates like nitroglycerin Nitrostat or isosorbide mononitrate Imdur should not take PDE5 inhibitors, as doing so could result in a dangerous drop in blood pressure. These sites may send you dangerous counterfeits instead of the meds you need. · Erectile dysfunction is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. When a . Generic Viagra (sildenafil): Starting at $24/month; Generic Cialis (tadalafil): Starting at $39/month; Generic Cialis Daily (tadalafil): Starting at $89/month; Branded . Viagra is available in mg, mg, and mg doses and can be purchased in day and day supplies. Shipping is free, and your new medication .