Tekturna HCT (generic: aliskiren/hydrochlorothiazide) is a prescription medication used to treat high blood pressure (hypertension). It is a single tablet containing two medications, aliskiren and hydrochlorothiazide. Aliskiren belongs to a group of drugs called renin inhibitors, which work by reducing renin production in the body to reduce blood pressure. Hydrochlorothiazide belongs to a group of drugs called thiazide diuretics, which work by stopping reabsorption of salt into your body. This prevents fluid from building up in the body.