Introduction: A Drug Class That Refused to Stay in One Box Phosphodiesterase type 5 inhibitors (PDE-5 inhibitors) represent one of the rare success stories in pharmacology where a drug class transcended its original purpose and reshaped multiple fields of medicine. Initially introduced for erectile dysfunction (ED), these agents—most notably sildenafil—have steadily expanded their clinical relevance […]

Introduction: When a Vascular Drug Learns Immunology Medicine has a long tradition of underestimating its own discoveries. A compound is developed with one purpose in mind, proves effective, and is promptly placed into a neat clinical box. Then, years later, someone asks an inconvenient question: “What else does it do?” This is precisely the story […]

Introduction: Reframing the Role of PDE-5 Inhibitors in Modern Medicine Phosphodiesterase type 5 (PDE-5) inhibitors have long been associated with the management of erectile dysfunction, yet this narrow perception obscures their broader and far more intriguing therapeutic potential. Among these agents, sildenafil has emerged as a pharmacological bridge between vascular biology and clinical innovation, particularly […]

Introduction: Rethinking Sildenafil in Modern Medicine The story of phosphodiesterase-5 (PDE-5) inhibitors begins with a pharmacological accident that became a clinical revolution. Originally developed to treat angina, sildenafil rapidly transitioned into a first-line therapy for erectile dysfunction. Yet, as is often the case in medicine, the most interesting effects of a drug emerge only after […]

Introduction: From Erectile Physiology to Urological Microcirculation Phosphodiesterase-5 (PDE-5) inhibitors were originally introduced into clinical practice as a revolutionary therapy for erectile dysfunction. Over time, however, their pharmacological relevance has extended far beyond the penile vasculature. Increasing evidence indicates that these agents—particularly sildenafil and tadalafil—exert important regulatory effects on vascular smooth muscle throughout the body. […]

Pulmonary arterial hypertension (PAH) remains one of the most challenging entities in cardiovascular and pulmonary medicine. It is rare, progressive, and, if left untreated, relentlessly fatal. Yet over the past three decades, the therapeutic landscape has transformed from therapeutic nihilism to structured, pathway-targeted, and increasingly aggressive pharmacotherapy. Contemporary registry data from Japan provide a particularly […]

Introduction: A Common Condition Hidden in Plain Sight Erectile dysfunction (ED) is not a rare or marginal condition. It is a highly prevalent, age-associated, vasculogenic and psychosocial disorder that affects quality of life as profoundly as many chronic systemic diseases. The definition is straightforward—persistent inability to achieve or maintain an erection sufficient for satisfactory sexual […]

Introduction Penile fibrosis represents one of the most complex and underappreciated pathophysiological processes contributing to erectile dysfunction (ED). It lies at the intersection of vascular compromise, smooth muscle apoptosis, hormonal deficiency, oxidative stress, and chronic inflammation. Unlike the transient hemodynamic changes that define common ED, penile fibrosis introduces a permanent structural component—a stiff, inelastic alteration […]

Introduction Radical prostatectomy remains a cornerstone in the management of localized prostate cancer. While surgical refinements and nerve-sparing approaches have significantly improved outcomes, erectile dysfunction (ED) continues to be one of the most prevalent and distressing sequelae. For many men, postoperative sexual dysfunction represents not just a physiological challenge but also an existential threat to […]

Introduction Cancer remains one of the greatest medical challenges of our era. While advances in genomics, immunotherapy, and targeted agents have transformed clinical outcomes in select cancers, metastasis and therapeutic resistance continue to drive mortality. The underlying biology of metastasis has been studied for decades, but the last two decades have crystallized one crucial concept: […]