This medicine is used to treat high blood pressure. Atenolol blocks chemicals such as adrenaline. It prevents them from increasing heart rate, blood pressure, and oxygen use.
Chlorthalidone lowers blood pressure.
It gets rid of extra salt and water in the body by acting on the kidneys. Take with or without food. Take with food if this medicine causes an upset stomach. Take early in the day to prevent getting up at night to use the bathroom. Do not take antacids or calcium supplements less than 2 hours before or 6 hours after this medicine.