Patients with severely impaired autonomic control of blood pressure may be particularly sensitive to the actions of vasodilators, including PDE5 inhibitors. What does Cialis look like? How well does Cialis work? The as-needed dose is usually 10 mg but can range from 5—20 mg. Counseling patients about the protective measures necessary to guard against sexually transmitted diseases, including Human Immunodeficiency Virus HIV should be considered. Each Cialis tablet is marked on one side with the dose of tadalafil it contains.Cialis Dosages. The most appropriate Cialis dose for you will depend on your needs, your healthcare provider’s assessment and how well you respond to the medication. Cialis is available in two forms: As a daily-use medication in dosages of mg and 5mg. For use as needed in dosages of 10mg and 20mg. Cialis (tadalafil) is a brand-name prescription medication. The Food and Drug Administration (FDA) has approved it for use in adult males.* It’s approved to: treat erectile dysfunction (ED). How we vet brands and products Tadalafil is a generic version of the prescription drug Cialis. Doctors prescribe it to treat erectile dysfunction and benign prostatic hyperplasia. It helps.