You will still need to be sexually stimulated to be able to get an erection and maintain it. Furthermore, the longer half-life is the basis for tadalafil’s daily therapeutic use in treating pulmonary arterial hypertension. Continue to take tadalafil even if you feel well. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. For further information contact your pharmacist or Eli Lilly and Company directly. Always discuss with your health care practitioner ALL of the medications you are taking prescription and over-the-counter that way, you can receive the best advice for your own situation.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. Dosage range: mg to 5 mg. Frequency: once daily, regardless of the timing of sexual activity. Cialis’s recommended dosage when it’s taken as needed for ED is as follows. Dosage range: 5 mg to 20 mg. Frequency: one dose at least 30 minutes before sexual activity, with a maximum of one dose per day*. While there’s no way to completely avoid Cialis side effects, here are some tips that can help decrease your risk for side effects: your doctor may recommend an over-the-counter pain relief.