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Lasix is a drug with a diuretic effect that is used to treat swelling due to acute and chronic heart failure as well as impaired kidney function. It is available in both tablet and injection form. Furosemide, the main active substance of Lasix, is an effective diuretic. The medicine addresses and alleviates the swelling of tissues when the excretory system of the human body cannot cope with such issues.

Instructions for the use of Lasix are available in each package of the medication. These directions should be thoroughly studied before use so that the user can avoid side effects and/or serious complications.

Unpleasant symptoms may occur in the following cases:

  • Acute and chronic heart failure
  • Hypertension
  • Impaired renal function
  • Liver failure

Lasix affects the excretory system in that it allows the patient to remove excess fluid in the body to improve their physical condition. During prolonged use of the drug, additional medical products are also prescribed to be taken in conjunction to restore the water–electrolyte balance in the body. These drugs generally contain potassium and magnesium, which are actively washed out when using diuretics, so these two groups of medicines are always used together.


Lasix is generally prescribed for the following in suitable patients:

  • Noticeable swelling
  • Labored breathing
  • Pain in the chest
  • Dizziness
  • Loss of consciousness
  • Disorientation in space

Patients are advised not to self-medicate with Lasix, as this drug is used as part of an emergency therapy regimen when the patient is in critical condition. In order to accelerate the action of the drug, it is sometimes used in the form of injections administered directly into the vein. Lasix is rarely injected intramuscularly because, with this method of administration, the substance does not prompt a reaction for a long period of time.

Often, in patients with an excessive accumulation of fluid in the body, the blood pressure is always increased, so the treatment with Lasix may cause a hypertensive crisis. Wrong treatment or its complete absence is fraught with severe consequences like hemorrhages, confluence in coma, and death.


Diuretics based on furosemide are not suitable for administration in all patients. There is a list of absolute contraindications which prevent the taking of this drug. In the case of intolerance to any components of the drug or allergic reactions to furosemide, the treatment should be stopped.

If the patient is dehydrated, taking a diuretic can produce a harmful effect. In acute renal failure, uncontrolled administration of the drug is undesirable. A lack of potassium and magnesium in the body is a contraindication to the use of Lasix until the electrolyte balance is restored. When the levels of these trace elements reach a relatively stable height, a diuretic can be used if still necessary.