Most online providers require a picture of a valid ID, a selfie showing your face, and a recent blood pressure reading taken with a home blood pressure monitor or by a medical provider. We also looked at additional services, such as access to digital pharmacies and home delivery options. Sildenafil the active ingredient in Viagra remains active for hours, so it requires more careful planning to ensure you experience the effects when you need them. In some states, a short video consultation might be required which usually occurs immediately upon completing your questionnaire. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Other warning signs of an unsafe online pharmacy include outdated medication, no customer service, or suspiciously low prices. However, all medications come with risks.What is Cialis? Cialis relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate).  · Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostatic hyperplasia. Learn about dosage, side effects, and more. According to the company site, it makes chewable versions of sildenafil (Viagra) and tadalafil (Cialis). While the active ingredients have FDA approval, chewable forms of these drugs.