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Lasix 40mg (Furosemide)

Lasix 40mg (Furosemide) x60 60 $0.6 $36.00
Lasix 40mg (Furosemide) x90 90 $0.5 $45.00
Lasix 40mg (Furosemide) x180 180 $0.4 $72.00
Lasix 40mg (Furosemide) x360 360 $0.3 $108.00

Product Information

Lasix 40 contains 40mg of Furosemide as the active ingredient. This drug is a loop diuretic or “water pill” that causes patients to make more urine by preventing the body from absorbing too much water and salt then passed in the urine. It is used to reduce extra fluid in the body. Salt (sodium and chloride), water, and other molecules are filtered out of the blood into the kidney tubules. The filtered fluid becomes urine and eliminated out of the body. The sodium, chloride and water that are filtered from the blood are usually reabsorbed into the blood before the fluid becomes urine. Furosemide blocks the absorption of sodium, chloride, and water from the filtered fluid in the kidney tubules to cause an increase in urine output.

With this action, Lasix is prescribed to treat edema or fluid retention caused by medical conditions such as kidney disease, liver disease, or heart failure. Lasix is also prescribed to treat high blood pressure alone or in combination with antihypertensive drugs to prevent strokes and heart attacks.


Lasix 40 is manufactured by Sanofi Aventis


Lasix is contraindicated to patients who are allergic to the active ingredient Furosemide, to any of the inactive ingredients of the tablet and allergy to sulfonamides. It is also contraindicated to those who are unable to urinate.

Warnings and Precautions

Before taking Lasix, a physician must first be informed if any of these medical conditions are present:

  • • Kidney disease
  • • Enlarged prostate, obstructed bladder and other urination problems
  • • Liver disease
  • • Electrolyte imbalance
  • • High cholesterol or triglycerides
  • • Diabetes
  • • Gout
  • • Lupus

Caution is recommended to patients with diabetes because Furosemide may affect blood sugar. Regularly checking blood sugar may be needed.

This medication may also reduce potassium blood levels. Patients taking this medication may be advised to take potassium supplements or increase potassium rich foods in the diet.

Furosemide may increase sensitivity to sunlight. Avoid excessive sun exposure, tanning booths, and sunlamps. Wear protective clothing and use sunscreen when outdoors.

Driving, using hazardous machineries, and performing activities that require alertness and clear vision must be avoided because the medication can cause dizziness and blurring of vision.

Severe diarrhea, vomiting, and sweating may increase the risk of dehydration while taking Furosemide.

A physician must be informed of all medications being taken before using Lasix. Drug interactions may affect the efficacy of the medication or cause adverse effects. Lasix may interact with the following medications:

  • • Ethacrynic acid
  • • Lithium
  • • Phenytoin
  • • Methotrexate
  • • Antivirals
  • • some antibiotics
  • • bowel disorder medications
  • • some pain and arthritis medications
  • • some antihypertensives
  • • sucralfate

This is not a complete list of interactions.

Lasix and Alcohol

Avoiding alcohol consumption while taking Lasix is recommended because of the increased risk of side effects.

Lasix and Grapefruit



Each individual dosage will be different because it greatly depends on the medical condition to be treated, age, and the response to treatment. Consult a physician for accurate dosing instructions. Below are the usual recommended dosages of Lasix:


An initial dose of 20mg to 80mg given as a single dose, taken once daily. Dose may be increased by 20 to 40mg every 6 to 8 hours. Succeeding doses should be given after 6 to 8 hours from previous dose. Dose may be titrated up to 600mg per day.


An initial dose of 20 to 80mg, in two divided doses, taken every 12 hours

Geriatric patients usually start at the low end of the dosing range.

Lasix must be taken strictly as directed by the physician. It must not be taken more than the prescribed dose. A tablet must be taken by mouth, with or without food. This medication must be taken regularly even if one starts to feel well just like in hypertensive patients, to get optimum benefit from the drug. Hypertension usually does not present symptoms. The tablet starts to work within one hour after oral intake, and the effect lasts for about 6-8 hours. It is best to avoid taking the tablet within 4 hours of bedtime to prevent waking up to urinate. Take a missed dose as soon as remembered. Skip if it’s almost time for next dose. Never double the dose just to make up for the missed dose.

Side effects

Common side effects of taking Lasix include:

  • • Dizziness
  • • Headache
  • • Lightheadedness
  • • Blurred vision

These common side effects occur as the body adjusts to the medication. Get up slowly from a sitting or lying position to reduce the risk of lightheadedness and dizziness.

Lasix may cause serious dehydration or loss of body water and salt or minerals. The physician must be notified for any of the serious side effects:

  • • Sudden weakness or feeling ill, fever, chills
  • • Confusion
  • • Severe dizziness
  • • Fainting
  • • Drowsiness
  • • Problems with memory or speech
  • • Nausea and vomiting
  • • Loss of appetite
  • • Jaundice or yellowing of skin or eyes
  • • Hearing changes or hearing loss
  • • Signs of electrolyte imbalance – unusual dry mouth and thirst, muscle pain, weakness, lack of energy, fast or irregular heartbeat, mood changes, little or no urination
  • • Signs of kidney problem – change in amount of urine or no urination; painful or difficult urination; numbness, tingling, pain, redness or swelling of arms, feet, ankles, or legs
  • • Signs of severe skin reaction – fever, sore throat, painful skin, red or purple skin rash that causes blistering and peeling

An urgent medical attention is needed if a rare but serious allergic reaction occurs. Symptoms may include hives, rash, itching, troubled breathing, severe dizziness, swelling of face, throat, or tongue.

Refer to drug leaflet or consult a healthcare professional for more information on Lasix side effects.

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