Who should not take furosemide?

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You should not take furosemide (Lasix) if you're allergic to it. People who have trouble passing urine, a condition known as anuria, also should not take furosemide, a powerful diuretic that increases the need to urinate. Pregnant women should talk with their doctors to determine whether the benefit of taking furosemide outweighs the potential risk to their pregnancy.