If I am pregnant, is it safe to use hydrochlorothiazide?

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Experts recommend avoiding hydrochlorothiazide, or HCTZ (Aquazide H, Diaqua, Hydrocot and others) during pregnancy unless its benefits clearly outweigh its potential risks. HCTZ has not been studied well in pregnant women, but it is known to pass through the placenta to a developing fetus. The risks to the fetus are uncertain.

HCTZ is taken to relieve fluid retention. It is used to treat high blood pressure and various heart, liver and kidney disorders. If you are taking HCTZ and you become pregnant or are planning to be, talk with your doctor.