Do not use this medication if you are allergic to hydrochlorothiazide or if you are unable to urinate.
Before using this medication, tell your doctor if you have liver disease, kidney disease, asthma or allergies, gout, diabetes, or if you are allergic to sulfa drugs.
Avoid drinking alcohol, which can increase some of the side effects of hydrochlorothiazide.
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.
There are many other medicines that can interact with hydrochlorothiazide. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.
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.