Daily doses are often between 2. A phone or video consultation is sometimes required for legal purposes. The online pharmacy industry has exploded in the last several years, and your head may be spinning from all the choices. There are many safe, reliable online services offering ED prescriptions. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available. Cialis reaches its maximum effectiveness two hours after you take it.Dosage. The dose of Cialis you need will depend on whether you’re taking it daily or as needed. Daily doses are often between and 5 milligrams (mg). The as-needed dose is usually 10 mg but can range from 5–20 mg. The typicaldose of Viagra is 50 mg. However, the dosage can range from 25– mg. tadalafil Used for Benign Prostatic Hyperplasia, Erectile Dysfunction erectile dysfunction (ED) benign prostatic hyperplasia, or BPH). Tadalafil (Cialis) is available both as brand . Tadalafil, or generic Cialis, is most commonly used to treat erectile dysfunction (ED). However, it’s also used to treat benign prostatic hyperplasia (BPH) and pulmonary arterial hypertension.