The effect of Cialis Professional lasts longer and these tablets should be held under the tongue. Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours. A deep dive into the ins and outs of purchasing this popular medication online, ensuring that you make informed decisions every step of the way. And as the digital age continues to expand, staying informed is the best way to ensure you benefit from the convenience without compromising on safety. The drug works by increasing blood flow to the penis, thus aiding in achieving an erection.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.  · But on average, its effects start to lessen 2 to 3 hours after you take a dose. The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual. We would like to show you a description here but the site won’t allow more.