Do not take a double dose or more than one dose per day to make up for a missed one. Your health information should remain between your provider and yourself. How will Cialis be supplied? Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. This combination can cause dangerously low blood pressure.The most common side effects with Cialis are: headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours. Men who get back pain and muscle aches usually get it 12 to 24 hours after taking Cialis. Back pain and muscle aches usually go away within 2 days.  · The approved dosages of Cialis for ED, BPH symptoms, or both, are between mg and 20 mg a day or as needed. Dosages higher than 20 mg a day haven’t been studied, and it’s not known what. 52 10 results for “tadalafil 20 mg tablet” Results Prescription Required Tadalafil (Generic for Cialis) Tablets · 20mg · 6-day supply With insurance est. $ Estimated insurance .