Can I get generic Cialis mailed to me? Lemonaid doctors and nurse practitioners are licensed to prescribe in all the states where we operate. The trade-off is that the higher the strength, the greater the chance of side-effects and adverse events. A higher dose of tadalafil is needed if your body does not respond to the recommended dose. Tadalafil is the active ingredient in a branded drug called Cialis. Our Lemonaid doctors or nurse practitioners can advise the right dose for you.TADALAFIL (ERECTILE DYSFUNCTION) – ORAL (tah-DA-la-fil) COMMON BRAND NAME(S): Cialis. USES: Tadalafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, tadalafil works by increasing blood flow to the penis to help a man get and keep an erection. Tadalafil is the active ingredient in a branded drug called Cialis. Tadalafil is approved by the FDA to treat erectile dysfunction. It’s available from Lemonaid in 5mg, 10mg and 20mg strength. We don’t prescribe the mg dose. 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 cause erections that last a full day.