(1) Patients with a history of hypersensitivity to ingredients of ECARD LD&HD combination tablets, thiazides, or their analogues (e.g. sulphonamide derivatives such as chlortalidone) (2) Patients with anuria or patients under hemodialysis (3) Patients with acute renal failure (4) Patients with noticeably decreased Na and K levels in body fluids (5) Pregnant women or women planning to become pregnant