Cialis is a prescription medication containing the active ingredient tadalafil. Cialis belongs to a group of medications known as phosphodiesterase-5 (PDE-5) inhibitors. Healthcare providers commonly prescribe tadalafil to treat erectile dysfunction (ED).In some patients, concomitant use of these two drug classes can lower blood pressure significantly [see Drug Interactions 7. For treatment of erectile dysfunction as needed : Adults—10 milligrams mg as a single dose, no more than once a day, taken 30 minutes before you think sexual activity may occur. PDE5 is found in platelets. Four strengths of almond-shaped tablets are available in different sizes and different shades of yellow: 2. Swallow the tablet whole. Tadalafil has been extensively studied for ED. In trials of the drug, individuals taking Cialis saw a significant reduction in the frequency and urgency of urination and improved urine flow.WebSep 26, · Cialis: mg, 5 mg, 10 mg, and 20 mg, taken as needed; The cost of the medication is from $ per month for Cialis and from $40 per month for tadalafil. Online consultations are free of charge. WebJul 28, · Dosage for ED. • as needed dosage: 10 mg at least 30 minutes before sexual activity, with a maximum of one dose per day †. • daily dosage: mg once daily. • as . WebApr 11, · Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It’s also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include .Consideration should be given to the following: ED Patients should be stable on alpha-blocker therapy prior to initiating a PDE5 inhibitor. In trials of the drug, individuals taking Cialis saw a significant reduction in the frequency and urgency of urination and improved urine flow. When using this medicine for erectile dysfunction, the ability to have sexual activity may be improved for up to 36 hours after taking the tablet. Cialis is a brand-name prescription medication. If you are a Mayo Clinic patient, this could include protected health information. Tadalafil has been extensively studied for ED. Cialis is also highly effective in reducing the symptoms of BPH.