Chapter 56: Adult Renal and Urinary Medications

Urinary tract antiseptics including fosfomycin, methenamine, and nitrofurantoin work locally within the urinary system to inhibit bacterial growth in acute cystitis and chronic infections, though they lack systemic antibacterial efficacy. Methenamine requires acidic urine and moderate fluid intake to maintain therapeutic effectiveness. Fluoroquinolones serve as broad-spectrum antibiotics that inhibit bacterial DNA synthesis but carry significant risk for tendon rupture and central nervous system toxicity, necessitating adequate hydration and monitoring for crystalluria. Sulfonamides suppress bacterial growth through folic acid synthesis inhibition but pose serious risks including Stevens-Johnson syndrome and blood dyscrasias, requiring high fluid intake and immediate discontinuation if rash develops. Phenazopyridine provides symptomatic relief from urinary pain without treating underlying infection and notably discolors urine and interferes with laboratory testing. Anticholinergic and antispasmodic agents address overactive bladder and urge incontinence but are contraindicated in narrow-angle glaucoma and produce anticholinergic side effects. Cholinergic medications like bethanechol restore bladder tone in nonobstructive urinary retention with careful monitoring for cholinergic toxicity. Immunosuppressant agents including cyclosporine and tacrolimus prevent allograft rejection in transplant recipients but require precise dosing schedules, regular therapeutic drug monitoring, and dietary restrictions due to nephrotoxic and metabolic complications. Hematopoietic growth factors encompassing erythropoietic, leukopoietic, and thrombopoietic agents address bone marrow suppression and anemia associated with chronic kidney disease and chemotherapy. Alpha-adrenergic blockers and five-alpha reductase inhibitors manage benign prostatic hyperplasia through complementary mechanisms affecting bladder outlet obstruction and prostate volume reduction. Understanding medication classes, mechanisms of action, adverse effects, drug interactions, and nursing interventions ensures safe and effective management of renal and urinary conditions.