Ziak 5mg/6.25mg is a medication that contains the active ingredient Hydrochlorothiazide. Hydrochlorothiazide is a diuretic (water pill) that helps to lower blood pressure by increasing urine production and reducing the amount of excess fluid in the body. It is commonly prescribed to treat hypertension (high blood pressure) and to manage edema (fluid retention) associated with various conditions. Ziak 5mg/6.25mg is a specific dosage formulation of Hydrochlorothiazide that is prescribed by healthcare professionals to individuals who require this particular strength.