Without physical action to the penis, such as that occurring during sexual intercourse, tadalafil will not work to cause an erection. Tadalafil may cause side effects. Take tadalafil at around the same time every day. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. If you are taking tadalafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire.The recommended starting dose for Cialis intended for once daily use is mg, take at the same time each day, without regard to timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. May be taken with or without food. Cialis is available as a generic, under the name tadalafil. 3. Apples, oranges. They’re different drugs, so it’s not a straight up better or worse comparison. Some men prefer Cialis and some Viagra. The biggest difference between Viagra and Cialis is that Cialis lasts longer (up to 36 hours instead of up to 5 hours) and there’s a version you can take every day (Cialis Daily). heart attack symptoms – chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating. Common tadalafil side effects may include: headache; flushing (warmth, redness, or tingly feeling); nausea, upset stomach; stuffy nose; or. muscle pain, back pain, pain in your arms, legs, or back. This is not a complete list of side.