Telmeros H: 40mg/12.5mg The tablet contains two medications that help regulate high blood pressure. Telmeros H 40mg/12.5mg Tablet consists of two medications: telmisartan and hydrochlorothiazide. It is typically used when a single medication is ineffective in managing blood pressure. Telmisartan works by relaxing and broadening your blood vessels, allowing your blood to flow more readily. This lowers your blood pressure. Hydrochlorothiazide is a diuretic (water pill) that increases urine production, decreasing blood pressure. Controlling your blood pressure reduces your risk of having a heart attack, stroke, or renal problems. The medicine must be taken on a regular basis as indicated to be effective.