Talk to your doctor about which dosing schedule is right for you. In some cases, ED can cause a strain on relationships and impact self-esteem. Common side effects include headache, facial flushing, indigestion, and dizziness. In , the Phase 2 clinical studies were initiated for males experiencing ED, then progressed to the Phase 3 trials that supported the drug’s FDA approval. Check the healthdirect’s medicines section for more information about tadalafil. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication.Cialis (tadalafil) is an expensive drug used to treat erection problems in men. It may also be used to treat the enlargement of the prostate gland. This drug is slightly more popular than comparable drugs. It is available in both brand and generic versions. Cialis is not covered by most Medicare and insurance plans, but manufacturer and. You need a prescription from a doctor to buy tadalafil. You can buy it from a store-based pharmacy or reputable online pharmacy with a prescription. Some people buy tadalafil online without a prescription. This isn’t a good idea, as you can’t be sure whether these pills contain the medicine or are counterfeit. Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men.