More Info About our pharmaceutical grade Xcite Cialis: Cialis is used to treat erectile dysfunction. It can be taken daily at lower dosages or on demand at full dosage. It can stay active in the body for up to 36 hours but only works when you are aroused. You do not need a prescription to order our pharmaceutical grade Cialis. Side effects: Headaches Dizziness Flushing of the face Nasal congestion Upset stomach Muscle and back pain Recommended dose: 10-25mg a day