However, because sexual stimulation is required to initiate the local penile release of nitric oxide, tadalafil’s inhibition of PDE5 will have no effect without sexual stimulation. Dosing Guidelines Typical Cialis dosages will differ depending on the conditions it’s prescribed to treat as well as other factors. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Ask your pharmacist for a list of the ingredients. What special precautions should I follow? Tell your doctor if any of these symptoms are severe or do not go away: headache. Read more on male sexual health on the Sexual Health Australia site.Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection. 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. Save up to 97% on tadalafil cialis with GoodRx Different pharmacies offer different prices for the same medication. GoodRx helps find the best price for you. like mg or 5 mg. The 20 mg tablet is the highest strength and is often not preferred because it has the potential to cause erections that last a full day. Dosage will vary from.