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Who shouldn't take diuretics (water pills) for high blood pressure?

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Some diuretics are sulfa drugs, so they could cause a reaction if you're allergic.

Older people tend to have more side effects such as fainting and dizziness from dehydration. You'll need to work closely with your doctor.

Diuretics aren't recommended for women who are pregnant or breastfeeding. We don't know how these drugs affect an unborn baby -- and many pass into breast milk, which can dehydrate babies.

Kids can safely take them, but they need smaller doses. The side effects are similar to adults, but potassium-sparing diuretics can cause low levels of calcium, which could hurt bone development.

American Heart Association: "Types of Blood Pressure Medications."

Blood Pressure UK: "Diuretics - blood pressure medication."

Mayo Clinic: "High blood pressure (hypertension): Diuretics."

European Heart Journal : "Adverse reactions to diuretics."

Consumer Reports : "What to Know About Diuretics for High Blood Pressure."

Reviewed by James Beckerman on May 02, 2017

American Heart Association: "Types of Blood Pressure Medications."

Blood Pressure UK: "Diuretics - blood pressure medication."

Mayo Clinic: "High blood pressure (hypertension): Diuretics."

European Heart Journal : "Adverse reactions to diuretics."

Consumer Reports : "What to Know About Diuretics for High Blood Pressure."

Reviewed by James Beckerman on May 02, 2017

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