Prescription requiredCardiac / Antihypertensive

Lasix 40 Tablet — Side Effects & Warnings

Known side effects of Lasix 40 Tablet include Dizziness Weakness Dehydration Decreased potassium level in blood Increased blood uric acid Decreased magnesium level in blood Increased thirst. Not everyone experiences these side effects.

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated June 2026

Common Side Effects

Dizziness Weakness Dehydration Decreased potassium level in blood Increased blood uric acid Decreased magnesium level in blood Increased thirst

This is not an exhaustive list. Consult your doctor if you notice any unusual symptoms.

Pregnancy Safety

Lasix 40 mg Tablet may be unsafe to use during pregnancy.<br/>Animal studies have shown adverse effects on the foetus, however, there are limited human studies. The benefits from use in pregnant women may be acceptable despite the risk. Please consult your doctor.

Alcohol Interaction

Taking Furosemide with alcohol may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate.

Lasix 40 Tablet — Safety Summary

Composition: Frusemide (40mg)
Prescription: Required (Rx)
Pregnancy: Lasix 40 mg Tablet may be unsafe to use during pregnancy.<br/>Animal studies have shown adverse effects on the foetus, however, there are limited human studies. The benefits from use in pregnant women may be acceptable despite the risk. Please consult your doctor.
Alcohol: Taking Furosemide with alcohol may have additive effects in lowering your blood pressure. You may experience headache, dizziness, lightheadedness, fainting, and/or changes in pulse or heart rate.

Lasix 40 Tablet — Safety FAQs

What should I do if I experience side effects?

Mild side effects often resolve on their own. If side effects are severe or persistent, stop the medicine and consult your doctor immediately.

Are all listed side effects common?

No. Some side effects are common while others are rare. Not everyone experiences side effects. Consult your doctor if you are concerned.

Can I take this medicine with other drugs?

Some medicines interact with each other. Always inform your doctor about all medicines you are currently taking.

When should I seek emergency help?

Seek immediate medical attention if you experience severe allergic reactions (difficulty breathing, swelling of face/throat), chest pain, or any life-threatening symptoms.

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Safety disclaimer

This information is for educational purposes only and is not a substitute for professional medical advice. If you experience severe side effects, seek medical attention immediately.

Lasix 40 Tablet — Side Effects & Warnings

Medically reviewed by Dr. Balaji Krishnan, MBBS · Updated June 2026