Those who don’t feel comfortable discussing ED with an in-person provider or lack time to visit a doctor’s office may find online ED prescriptions beneficial. 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. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication. An erection results from an increase in blood flow to the penis. Finding an online ED provider can feel overwhelming.Best subscription with free consultations. Hims Cialis. (3+) from Hims. Type: tablet. Delivery time: 2–5 business days. Prescription needed: yes. Dosage: 5 mg. Usage: take as needed or daily. Cialis and generic tadalafil are available in four different strengths— mg, 5 mg, 10 mg and 20 mg—but which one should you take? If you’ve never tried Cialis before, your doctor will likely start you on a low dose, like mg or 5 mg. The 20 mg tablet is the highest strength and is often not preferred because it has the potential to. Generic Cialis (tadalafil): Starting at $39/month; Generic Cialis Daily (tadalafil): Starting at $89/month; Branded Viagra: Starting at $70/dose; Branded Stendra: Starting at .