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Brand Name: Lasix Generic Name : Furosemide

This medicine is a diuretic or "water pill".

What does this medicine do?

  • Removes extra fluid from the body
  • Used after heart surgery and to treat/prevent congestive heart failure

How should I give my child this medicine?

  • Give at the same time each day as directed
  • Give with or without food/liquids
  • Can be given in liquid form or as a pill. The liquid should be measured only with an oral syringe.
  • Because Lasix increases the number of times a child must urinate, older children may prefer to take this medicine a couple of hours before bed time so that their sleep is not disturbed.

What should I do if my child vomits after a dose?

If the vomiting occurs within 15 minutes after the medicine is given, give the entire dose again. If more than 15 minutes have passed, do not give it again until the next scheduled dose.

What should I do if my child misses a dose?

Give the dose as soon as you remember it, up to 2 hours later. If it is more than 2 hours late, skip the missed dose and give the next dose at the regular time. Never try to make up missed doses by giving extra medicine.

What precautions or special instructions should I know about?

  • Lasix lowers the potassium level in the body because of increased urination. Children can get extra potassium by eating or drinking foods rich in potassium including orange juice, bananas, potatoes, grapefruit, milk, raisins, prunes, yogurt, wheat germ and apricot juice.
  • Children taking Lasix and other diuretics can become easily dehydrated if they have diarrhea or vomiting that lasts more than 24 hours. For babies on diuretics, this can happen even quicker. Signs of dehydration in children include decreased urine output, dry mouth, lack of tears with crying, and dry skin. In babies, another sign of dehydration is that the soft spot on top of the head becomes depressed or sunken. If you notice any of these signs in a child with vomiting or diarrhea, please call your child's doctor right away.

What are the common side effects?

  • Frequent urination
  • Constipation

Unlikely, but report:

  • Hearing loss or ear ringing
  • Muscle cramps or weakness
  • Nausea
  • Dizziness
  • Tiredness

This information does not cover all the uses, precautions, side effects or interactions of this medicine. If you have any further questions, please contact your doctor.

2006: Information reviewed by Lynda Dettling BSN, RN

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