Prescription onlyLower-cost generic available



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Lowers blood pressure. Removes extra water from your body.

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Prescription onlyLower-cost generic available

Our pharmacists’ bottom line

Lasix (Furosemide) is a very effective water pill and it'll certainly make you go to the bathroom more often.

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  • A strong diuretic (water pill) that works well to get rid of extra fluids in your body through urination.
  • Lowers your blood pressure and your risk of heart attack and stroke.
  • Works better than thiazide diuretics (like Hydrochlorothiazide) at removing harmful levels of certain electrolytes, such as potassium.
  • Okay to take if you have kidney problems.
  • Makes you urinate very frequently.
  • Can cause low levels of important electrolytes, such as potassium.

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Side effects for Lasix (Furosemide)

Manufacturers don’t say how common these side effects are

  • Agranulocytosis (rare)
  • Aplastic anemia (rare)
  • Bleeding under the skin
  • Blurred vision
  • Constipation
  • Cramping
  • Destruction of red blood cells
  • Diarrhea
  • Dizziness
  • Erythema multiforme
  • Exfoliative dermatitis
  • Fever
  • Headache
  • High blood sugar
  • Hives
  • Hyperuricemia
  • Interstitial nephritis
  • Itching
  • Jaundice, yellow skin or eyes (intrahepatic cholestatic jaundice)
  • Loss of appetite
  • Low red blood cells
  • Low white blood cells
  • Mouth and stomach irritation
  • Muscle spasm
  • Nausea
  • Necrotizing angiitis
  • Pancreatitis
  • Positional low blood pressure
  • Rash
  • Restlessness
  • Ringing in the ears
  • Sensitivity to light
  • Sugar in urine
  • Systemic vasculitis
  • Thrombocytopenia
  • Thrombophlebitis
  • Tingling sensation
  • Urinary bladder spasm
  • Vertigo
  • Vomiting
  • Weakness
  • Xanthopsia

What to expect when you take Lasix (Furosemide) for Swelling

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Tips from our pharmacists
  • Starts working in 30 minutes.
  • Makes you urinate more often, so avoid taking it at bedtime.
  • Can cause dizziness in the first few days.
  • Check your blood pressure 1 week after starting this medicine, and tell your doctor if it hasn't improved.
  • Tell your doctor about any dizziness, fatigue, or muscle weakness that doesn't go away.
  • Requires routine blood tests to check kidney function.

Risks and Warnings for Lasix (Furosemide)

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    • Higher risk if:
    • Current electrolyte imbalance

    Too much Lasix (Furosemide) can cause excessive urine production, which leads to dehydration and low levels of sodium, calcium, potassium or magnesium. The electrolyte imbalance can have negative affects on your muscles or other important organs. Any existing fluid or electrolyte imbalances should be addressed before using Lasix (Furosemide). Any changes for the medicine should be made by a doctor.

    This is a black box warning. The FDA requires this warning when there is a significant risk of serious or life-threatening effects that anyone taking the drug should consider.

Means that some groups have a high risk of experiencing this side effect

Tips from pharmacists and people taking Lasix (Furosemide)

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The FDA category for this medication is C. It is advised that you: Weigh risks vs. benefits
Kidneys and liver
  • Upsides and downsides from our pharmacists
  • Okay to take if you have kidney problems.
  • Tips from our pharmacists
  • Requires routine blood tests to check kidney function.
  • I take Mirtazapine (Remeron ) for depression. Caused major edema so started lasix and water weight slid right off. Doc switched to Spironolactone, and my edema is back full force. 9 lbs in 24 hrs and so painful in legs =(
    Age: 38
    Gender: Woman