Lasix is a loop diuretic (water pill) that prevents your body from absorbing too much salt, allowing the salt to instead be passed in your urine.
Lasix treats fluid retention (edema) in people with congestive heart failure, liver disease, or a kidney disorder such as nephrotic syndrome. This medication is also used to treat high blood pressure (hypertension).
Lasix may also be used for other purposes not listed in this medication guide.
Do not use Lasix if you are unable to urinate.
To be sure Lasix is not causing harmful effects, your blood will need to be tested on a regular basis. Your kidney or liver function may also need to be tested. Do not miss any scheduled appointments.
Lasix will make you urinate more often and you may get dehydrated easily. Follow your doctor’s instructions about using potassium supplements or getting enough salt and potassium in your diet.
Avoid becoming dehydrated. Follow your doctor’s instructions about the type and amount of liquids you should drink while you are taking this medication.
If you are being treated for high blood pressure, keep using Lasix even if you feel fine. High blood pressure often has no symptoms.
Before using this medication, tell your doctor if you have kidney disease, liver disease, gout, lupus, diabetes, or an allergy to sulfa drugs.
If you have any of these conditions, you may need a dose adjustment or special tests to safely take Lasix.
FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. This medication can pass into breast milk and may harm a nursing baby. Do not use Lasix without telling your doctor if you are breast-feeding a baby.
What should I avoid while taking Lasix?
Avoid becoming dehydrated. Follow your doctor’s instructions about the type and amount of liquids you should drink while you are taking Lasix.
Avoid exposure to sunlight or artificial UV rays (sunlamps or tanning beds). Lasix can make your skin more sensitive to sunlight and sunburn may result. Use a sunscreen (minimum SPF 15) and wear protective clothing if you must be out in the sun.
What are the possible side effects of Lasix
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
40 mg 1-2 times per day
dry mouth, thirst, nausea, vomiting;
feeling weak, drowsy, restless, or light-headed;
fast or uneven heartbeat;
muscle pain or weakness;
urinating less than usual or not at all;
easy bruising or bleeding, unusual weakness;
a red, blistering, peeling skin rash;
hearing loss; or
nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Less serious side effects may include:
diarrhea, constipation, or stomach pain;
numbness, burning, pain, or tingly feeling;