Sodium and chloride ions (NaCl)

Sodium and chloride ions are the primary extracellular electrolytes in the human body, essential for maintaining osmotic pressure and fluid homeostasis [StatPearls: Physiology, Sodium]. Sodium is the major cation responsible for the initiation and propagation of action potentials in excitable tissues like nerves and muscles, while chloride is the predominant anion that maintains electrical neutrality and participates in acid-base balance [StatPearls: Physiology, Chloride]. While these ions are not therapeutic targets in the sense of being proteins, their systemic levels are the primary focus of numerous pharmacological interventions. For instance, diuretics target the transporters and channels that move these ions to manage conditions like hypertension and edema [DrugBank: Diuretics]. Dysregulation of these ions is associated with significant clinical conditions, including hyponatremia, hypernatremia, and cystic fibrosis, the latter of which is caused by defective chloride transport [NIH: Cystic Fibrosis]. In clinical settings, sodium and chloride levels are closely monitored as biomarkers for renal function and fluid status.

Other names

Sodium chlorideNaClSaltElectrolytes

Drugs typically modulate the transport of these ions across cell membranes via specific transporters (e.g., SLC12A3) or channels (e.g., SCN9A, CFTR) to regulate physiological processes such as blood pressure and fluid volume [DrugBank: Diuretics; StatPearls: Physiology, Sodium].