Tadalafil is a popular medication prescribed for erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH). Understanding the correct dosage and timing is crucial for safe and effective treatment. Key takeaways Tadalafil can be taken either on an “as needed” basis or daily at a lower dose. Daily tadalafil allows for more spontaneous sexual activity and for more continuous symptom relief of benign prostatic hyperplasia (enlarged prostate). Though common side effects of tadalafil are usually mild, taking tadalafil daily means being exposed to them more regularly, which may not be. Tadalafil is FDA -approved for males as a therapy to treat and prevent symptoms of benign prostatic hyperplasia, such as urinary urgency, hesitancy, weak stream, dribbling, and incontinence. Tadalafil belongs to a group of medicines, known as phosphodiesterase-5 (PDE-5) inhibitors, which are used to treat erectile dysfunction or pulmonary arterial hypertension. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. Brand names: Cialis, Adcirca. Tadalafil comes only as a tablet you take by mouth. Tadalafil is used to treat the symptoms of benign prostatic hyperplasia (BPH) and erectile dysfunction (ED). Cialis (tadalafil) is a prescription medication that treats erectile dysfunction by improving blood flow to the penis. Tadalafil (Eqv-Cialis) is used in adult men to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Tadalafil (Eqv-Cialis) can also be used in men and women to treat pulmonary arterial hypertension (PAH) and improve exercise capacity. Tadalafil relaxes muscles of the blood vessels and increases blood flow to particular areas of the body. Tadalafil under the name of Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Tadalafil is a generic drug prescribed for erectile dysfunction and other conditions. Learn about the drug’s dosages, form, strengths, and more.