Tadalafil is not usually used to treat benign prostate enlargement because there is not enough evidence about how well it works. Privacy: Confirm that your personal data and payment details are confidential. With PAH, high blood pressure develops when a blockage in the arteries within the lung limits normal blood flow. There’s no good evidence that tadalafil works for women with sexual problems. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. An erection results from an increase in blood flow to the penis.Cialis comes as a tablet you swallow. It contains the active ingredient tadalafil. (An active ingredient is what makes a drug work.) Keep reading for details on Cialis and cost, and how to save. Medical Consultation Required: Yes Medications Prescribed: Viagra, Cialis, sildenafil, tadalafil Generic offered: Yes Why We Chose It. Along with other medications used to treat ED, Cialis and generic tadalafil are only available by prescription. Tadalafil, like other phosphodiesterase type 5 (PDE5) inhibitors, can interact.