It's a thiazide diuretic.

Thiazide diuretics include such commonly used diuretics as hydrochlorothiazide (HydroDIURIL, Esidrix), chlorothiazide (Diuril), and chlorthalidone (Hygroton)

No, Thiazide Diuretics actually increase renal excretion of Phosphate. They inhibit the sodium-chloride symporter in the distal convoluted tubule of the kidney, leading to increased excretion of sodium, chloride, and also phosphate.

There are 12 thiazide diuretics marketed in the United States, including hydrochlorothiazide (Hydrodiuril, Esidrex), indapamide (Lozol), polythiazide (Renese), and hydroflumethiazide (Diucardin).

Potassium imbalance is worsened by taking thiazide diuretics, corticosteroids, and licorice root.