Generic Cialis, or Tadalafil, is available in several doses in tablet form: milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as needed before sexual.One dose of tadalafil taken as needed for sexual activity can remain effective for up to 36 hours, however peak concentration of tadalafil in the bloodstream usually occurs between 30 minutes and 6 hours with a median time of 2 hours. Learn more about tadalafil. Tadalafil is the active ingredient in a branded drug called Cialis. This daily option is meant for long-term continuous use and a planning-free experience. Our Lemonaid doctors or nurse practitioners can advise the right dose for you. Serious side effects are rare, but may include a life-threatening drop in blood pressure, allergic reaction, sudden vision loss, hearing loss, and priapism an erection lasting four hours or longer. After beginning a daily regimen of tadalafil, you may be able to have successful intercourse in as early as 4 to 5 days.Take tadalafil (Cialis) as prescribed by your provider. If you’re taking tadalafil (Cialis) as-needed for ED, you should take no more than one dose per day. The effects of tadalafil (Cialis) should last for up to 36 hours after a dose. Taking this medication more often can raise your risk for serious side effects, such as priapism or vision. 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. Generic Cialis, or Tadalafil, is available in several doses in tablet form: milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as needed before sexual.Some examples of these drugs include nitroglycerin, amyl nitrate, doxazosin, erythromycin, ketoconazole, rifampin, riociguat, ritonavir, tamsulosin, itraconazole, and poppers. Tadalafil taken as-needed for sexual activity is usually used at higher doses because it does not have time to build up in your system. Can you take tadalafil every day? Tadalafil dosing also depends on whether or not it is taken daily or as-needed. This daily option is meant for long-term continuous use and a planning-free experience.