Do not use this medication if you are allergic to chlorthalidone or if you are unable to urinate.
Before using this medication, tell your doctor if you are allergic to sulfa drugs, or if you have liver disease, kidney disease, asthma, allergies, gout, lupus, or diabetes.
Avoid drinking alcohol, which can increase some of the side effects of chlorthalidone.
Avoid becoming overheated or dehydrated during exercise and in hot weather. Follow your doctor’s instructions about the type and amount of liquids you should drink. In some cases, drinking too much liquid can be as unsafe as not drinking enough.
If you are being treated for high blood pressure, keep using this medication even if you feel fine. High blood pressure often has no symptoms.