CIALIS for Use cialis black online as Needed for Erectile Dysfunction. The recommended starting dose of CIALIS for use as needed in most patients is 10 mg, taken prior to anticipated sexual activity. The dose may be increased to 20 mg or decreased to 5 mg, based on individual efficacy and tolerability. The recommended starting dose for treating erectile dysfunction is Cialis 10 mg, taken one hour prior to sexual activity. However, you may take the medication anywhere from 1 hour to 36 hours before sexual activity.Cialis is available in doses of 5mg, 10mg and 20mg. Find out which dosage is best for you and how often you can take it.36-hour CIALIS could work fast, inside 30 minutes for some men. Also it can last longer, approximately le dose, or you may get a larger dose than you need. Take one 36-hour CIALIS tablet at least 30 minutes prior to deciding to have intercourse. You might want to take CIALIS a couple of hours before sex.The recommended starting dose for treating the symptoms of an enlarged prostate is Cialis 5 mg daily. This is also the same dose that is used for treating both an enlarged prostate and erectile dysfunction at the same time .