Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Prolonged erections can be dangerous. What side effects can this medication cause? If you are taking tadalafil to treat erectile dysfunction, you should know that it does not cure erectile dysfunction or increase sexual desire. Therefore the use of such treatments in combination with Cialis is not recommended. It may be taken with or without food.They will review your symptoms and medical history to evaluate the best treatment option for you. Brand-name Cialis. $20 for a single 5-mg oral tablet; $80 for a single or mg oral. Before you buy Cialis, check the cheap offer on Generic Pills for men and women from authorised, online pharmacy in the U.S., Canada, and worldwide. All year huge price discounts. Hurry up! 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.