If you are taking tadalafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Tadalafil does not prevent pregnancy or the spread of sexually transmitted diseases such as human immunodeficiency virus HIV. And she has commented about my flaccid penis been bigger too which I did notice myself. Am I waiting to long or not long enough? I take the medication 30 min to an hour before sex and WOW…. · The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual Cialis dose is 10 mg (with a maximum daily dose of 20 mg). The typical dose of. 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.  · Went to the doctor and he prescribed cialis, 5mg a day. First time taking it had some side effects, flushing of the face, terrible headache for a day, and stuffy nose. Second dose only had the face flushing, third dose and on no side effects! From the first pill, sex has been awesome!!!