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Lasix (Furosemide) is a diuretic medication used to treat high blood pressure, congestive heart failure, and edema (fluid retention). It works by increasing the amount of urine your body produces, allowing your body to rid itself of extra fluid. Lasix also helps to reduce the amount of salt and water in the body, helping to lower blood pressure and reduce the risk of cardiovascular diseases.

Furosemide is a medication that can help reduce the amount of excess fluid in the body (edema) caused by conditions like heart failure, liver disease, and kidney disease. By reducing the amount of fluid, it can help to reduce symptoms such as difficulty breathing and swelling in the arms, legs, and abdomen.

Lasix is considered safe to take during pregnancy, but it should only be used if the potential benefits outweigh the risks. It is also used to treat fluid retention associated with some kidney and liver diseases.

Uses and Dosage

Lasix medication comes in tablet form and should be swallowed whole with water. It typically does not upset the stomach, so it can be taken with or without food. You can usually take Furosemide once a day in the morning, although sometimes it may be taken twice a day (once in the morning and once at lunchtime) or every other day. You do not need to take Furosemide at the same time every day, and you can occasionally take it at a different time if it is more convenient for you.

The usual dose of Furosemide to treat adults with high blood pressure is 40mg to 80mg per day, while the dose for those with heart failure or edema is 20mg to 120mg per day. For those over 65 years of age, the dose may be lower due to an increased risk of side effects. For babies and children, the dose is determined according to the child's weight or age.

Side Effect

Serious Side Effects of Furosemide.

  • Signs of a blood disorder including unexplained bruising or bleeding, an elevated temperature, sore throat, and mouth ulcers
  • Sign of an inflamed pancreas (pancreatitis) such as severe stomach pain which could reach through to your back
  • Signs of inflamed kidneys like severe pain in your side or blood in your urine
  • Ringing in your ears (tinnitus) or loss of hearing
  • Dehydration
  • Electrolyte imbalance

Common Side Effects of Furosemide Includes

  • Dry mouth
  • Feeling confused or dizzy
  • Feeling or being sick (nausea or vomiting)
  • Feeling thirsty
  • Headaches
  • Peeing more than normal

Form and Strength

Lasix and its generic alternative Furosemide are available in the following forms and strength:

Lasix Tablet

  • 20 mg
  • 40 mg
  • 80 mg

Furosemide Tablet

  • 20 mg
  • 40 mg
  • 80 mg


  • If you are trying to conceive or are already pregnant, it is important to speak with your doctor to discuss whether taking furosemide is the right decision for you.
  • Taking Furosemide may cause confusion and dizziness, so it is important to avoid driving, cycling, operating machinery, or using tools until you have fully recovered.
  • When taking a diuretic such as Furosemide, you should limit your consumption of foods that are high in sodium, as this can interfere with the effectiveness of the drug. To avoid this, try to limit your processed and ready-meal intake, and avoid adding extra salt when cooking or at the table.

Frequently Asked Questions (FAQ)

How long does furosemide take to work?

Furosemide starts to work within 1 hour, but it may take a few weeks to fully take effect.

Are there any long-term side effects?

Furosemide is safe to take for a long time, but you will have to see your doctor or nurse regularly for blood and urine tests. These make sure the chemicals in your blood are properly balanced.

Can I stop taking furosemide now that my blood pressure is lower?

Even if furosemide brings down your blood pressure successfully, it is best to continue taking it. If you stop taking it, your blood pressure could go back up again.

Can I drink alcohol while taking furosemide?

During the first few days of taking furosemide, it is best to stop drinking alcohol until you see how the medicine affects you. It may lower your blood pressure and make you feel dizzy.


Additional information

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20mg, 40mg, 80mg

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Online Pharmacies Canada has provided information from third parties intended to increase awareness and does not contain all the information about Lasix (Furosemide). Talk to your doctor or other qualified medical practitioners for medical attention or advice, or if you have any concerns about Lasix (Furosemide).