Cialis

Tadalafil selectively inhibits PDE5, the enzyme responsible for the breakdown of cGMP in smooth muscle cells. By slowing cGMP degradation, tadalafil enhances nitric oxide–mediated smooth muscle relaxation.

Key pharmacological mechanisms include:

Vascular smooth muscle relaxation: Supports increased blood flow in responsive vascular tissues.

Erectile function: Enhances blood flow to the corpus cavernosum during sexual stimulation, facilitating erection.

Prostatic and bladder effects: Relaxes smooth muscle in the lower urinary tract, potentially improving symptoms associated with BPH.

cGMP signaling: Prolongs the activity of a physiological pathway involved in vascular regulation.

Tadalafil facilitates the physiological response to sexual stimulation; it does not independently initiate sexual desire or produce an automatic erection.

Erectile Dysfunction (ED)

Tadalafil is indicated for the treatment of erectile dysfunction, a condition involving difficulty achieving or maintaining an erection sufficient for sexual activity. By enhancing nitric oxide–cGMP signaling, it improves the vascular response required for erection when sexual stimulation occurs.

Benign Prostatic Hyperplasia (BPH)

Tadalafil can improve lower urinary tract symptoms associated with BPH, including urinary frequency, urgency, and difficulty initiating urination. Its effects are associated with smooth muscle relaxation and modulation of lower urinary tract function.

Combined ED and BPH Symptoms

In appropriate patients, tadalafil may address both erectile dysfunction and urinary symptoms associated with BPH.