TELMI-K 40mg tablets contain telmisartan, an angiotensin II receptor blocker (ARB), and potassium. It is used to treat high blood pressure (hypertension) and improve heart health. Telmisartan works by relaxing blood vessels, while potassium helps balance electrolytes in the body, promoting proper muscle and nerve function. This combination is beneficial for managing blood pressure while preventing low potassium levels.