Most men start with and respond well to the 10 mg tadalafil dose. We will ask about your experience with generic Cialis as part of your visit. That means you can have erections whenever you want or need them. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. The generic versions are just as effective and much less expensive. However, it stays in your body for up to 36 hours and can be taken every 24 hours, so it can work for you constantly.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. Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. Generic Status No lower-cost generic available Availability Prescription only How Tadalafil (Cialis) works Tadalafil (Cialis) is a phosphodiesterase-5 enzyme (PDE-5) Missing: usa.