Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. It depends on the platform and insurance provider. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. How Does Cialis Work? Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication.Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include . Healthline’s picks for the best places to buy Cialis online. Most user-friendly. Hims Cialis. (3+) from Hims. Delivery time: 2–5 business days. Prescription needed: yes. Accepts. Just as household supplies are often cheaper when you buy them in bulk, filling a larger prescription can help you save on medications. For instance, let’s say you’re paying cash .