Lasix oral tablet is a prescription drug that’s available as the brand-name drug Furosemide. It is a type of medicine called a diuretic. Get to know how Lasix works, its side effects, precautions, and contraindications where Lasix is not suggested.

Overview about Lasix

Diuretics are sometimes called ‘water pills’ because they make you pee more. It’s also sometimes used to help you pee when your kidneys aren’t working properly. Lasix is available in different forms such as tablets, liquid and also be given by injection, but this is usually only done in the hospital. It is manufactured by Sanofi India Ltd.

  • Lasix removes excess salt and water from the body through urine and thus prevents your body from absorbing too much salt. This medication is also used to treat high blood pressure (hypertension).
  • It is also used to treat edema (a build-up of fluid in the body). Edema can be caused by other medical ailments such as kidney disease, heart failure, cirrhosis of the liver.
  • This tablet may be used as part of a combination therapy to treat High B.P. This means you may need to take Lasix with other drugs.

Lasix Uses and Benefits

Lasix and its substitutes are administered to control, prevent, and for the treatment & improvement of the following diseases, symptoms, and conditions:

  • Lasix is used to treat edema (fluid retention) in people with congestive heart failure
  • Liver disease
  • Kidney disorder such as nephrotic syndrome

How do Lasix works?

Lasix or furosemide is a diuretic. It removes excess water from the body by acting on the kidneys and increasing urine output. It is therefore used in states of excess fluid load like cirrhosis of the liver, renal failure, and congestive cardiac failure. It can cause electrolyte imbalance and hence should be used on doctor’s orders only.

Lasix works by helping your body get rid of excess salt and water. It does this by increasing the amount of urine your body makes. This helps lower your B.P as well as reduce swelling.

Lasix Side effects

Like all drugs, Lasix can cause side effects although not everyone gets them. Side effects often get better as your body gets used to the medicine.

Common side effects

Common side effects of Lasix happen in more than 1 in 100 people. The common side effects are:

  • Peeing more than normal – most people need to pee a couple of times within a few hours of taking Lasix. You may also lose a bit of weight as your body loses water.
  • Feeling thirsty with a dry mouth
  • Headache
  • Muscle cramps, or weak muscles
  • A fast or irregular heartbeat
  • Feeling confused or dizzy
  • Feeling sick or vomiting

If these side-effects are mild, they may go away within few days or in 2 weeks. If these effects are more severe or don’t go away, talk to your physician.

Lasix Dosage

The dosage, duration, and course are different from person to person. It depends on medical history, age, physical health and on the disease the medicine is administered for. Information provided here is for awareness purpose only. Please consult your doctor for proper dosage advise that suits your condition and avoid any possible side effects.

The dosage of Lasix in patients with edema and hypertension


For adults: The usual initial dose of Lasix is 20 to 80 mg given as a single dose.


For adults: The usual initial dose of Lasix for hypertension is 80 mg, usually divided into 40 mg twice a day.

Precautions while taking Lasix

Do not use this drug if you are unable to urinate. It is recommended to consult your doctor if you are suffering any below-mentioned conditions.

  • Kidney disease
  • Gout
  • Lupus
  • Diabetes
  • Enlarged prostate, bladder obstruction or other urination problems
  • Cirrhosis or other liver diseases
  • Potassium or magnesium low in your blood.
  • Cholesterol or triglycerides high in the blood.
  • An allergy to Sulfa drugs

Some other precautions to be taken care before using this medicine:

  • Please do inform your physician if you have recently had an MRI (magnetic resonance imaging) or any type of scan using a radioactive dye that is injected into your veins.
  • Lasix can pass into breast milk and may harm a nursing baby. This drug may also slow breast milk production. Do not use this drug without telling your doctor if you are breast-feeding a baby.
  • Avoid alcohol while taking this drug because it further lowers your blood pressure.
  • If it’s a tablet form take as it is prescribed. And try to take it in the daytime to avoid sleep disturbance.
  • If any adverse effects please do consult your doctor immediately. Do not discontinue the drug without intimation of your doctor.

Drug Interactions of Lasix

The drug interactions are different from person to person. So you need to check possible interactions with your doctor, before starting any medication.

  • Anti-depressants
  • Aminoglycoside antibiotics
  • Non-steroidal anti-inflammatory drugs
  • Alcohol
  • Diabetes

Missing dosage

If missed certain regular dose, take as earliest as possible and if it is an injection it’s time to time management is done by health care professionals in the hospital. But never consume extra doses.


Taking more than prescribed dose may cause harmful side effects and it is a medical emergency. Consult your physician immediately.

Contraindications of Lasix

Lasix contraindicated in following conditions

  • Allergy
  • Anuria

Alternatives of Lasix

The below-listed drugs are the alternatives of Lasix:

  • Hydrochlorothiazide
  • Lisinopril
  • Spironolactone
  • Edecrin
  • Digoxin
  • Lasipen
  • Frusamide

If for some reason an experienced doctor is not available around you, then you can contact us here.

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