What is the full name of the medication abbreviated as HCTZ?

The full name of the medication abbreviated as HCTZ is Hydrochlorothiazide. This medication is a thiazide diuretic commonly used to treat high blood pressure (hypertension) and to help reduce fluid retention (edema) caused by conditions such as heart failure or kidney disorders. Hydrochlorothiazide works by preventing the reabsorption of sodium and chloride in the kidneys, leading to increased urine production and a reduction in blood volume, which helps to lower blood pressure.

The other medications mentioned in the choices serve different purposes. Hydrocodone is an opioid pain medication, Hydroxychloroquine is primarily used in the treatment of autoimmune diseases and certain malaria cases, and Hydrocortisone is a corticosteroid used to treat inflammation and other conditions. Understanding the specific use and classification of each medication helps in the identification of their full names and distinguishes Hydrochlorothiazide as the correct answer.