DO NOT use Lasix if:
- are allergic to any ingredient in Lasix
- can't urinate
- you are taking ethacrynic acid.
Contact your doctor or healthcare provider immediately if any of these apply to you.
Some medical conditions can interact with Lasix. Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
- if you are pregnant, planning to become pregnant, or are breastfeeding
- if you are taking any prescription or non-prescription medicine, herbal preparation, or dietary supplement
- if you are allergic to medicines, foods or other substances
- if you have fluid in the abdomen (ascites), hearing problems, liver disease, diabetes, low urine output, kidney problems, lupus, gout, abnormal levels of electrolytes in the blood, high levels of uric acid in the blood, or the disease porphyria blood
- if you have had a heart attack, are dehydrated, or are on a low-salt diet.
Some medications can interact with Lasix. Tell your doctor if you are taking any other medicines, especially any of the following
- Corticosteroids (for example, prednisone) or corticotropin (ACTH) because they may increase the risk of low blood potassium levels
- Barbiturates (eg, phenobarbital) or narcotics (eg, codeine) because it can increase the risk of dizziness when standing up
- Aminoglycosides (eg, gentamicin), amphotericin B, angiotensin-converting enzyme (ACE) inhibitors (eg, captopril), cyclosporine, ethacrynic acid, tacrolimus, or vancomycin because serious kidney side effects may occur (decreased ability to urinate) or in the ears (hearing loss)
- Chloral hydrate because side effects such as excessive sweating, rapid heartbeat, and changes in blood pressure may occur
- Nonsteroidal anti-inflammatory drugs (NSAIDs) (eg, ibuprofen, indomethacin) because they can decrease the effectiveness of Lasix
- Digoxin, lithium, high blood pressure medications, salicylates (eg, aspirin), or succinylcholine because the risk of their side effects may be increased with Lasix
- Norepinephrine or tubocurarine because their effectiveness may be reduced by Lasix.
This may not be a complete list of all interactions that may occur. Ask your doctor if Lasix can interact with other medications you take. Check with your doctor before starting, stopping, or changing the dose of any medicine.
Important safety information:
- Lasix can cause dizziness or blurred vision. These effects may be worse if you take it with alcohol or certain medications. Use Lasix with caution. Don't drive or do other potentially unsafe tasks until you know how you react to it.
- Lasix can cause dizziness, lightheadedness, or fainting; alcohol, heat, exercise, or fever can increase these effects. To prevent them, sit or stand up slowly, especially in the morning. Sit or lie down at the first sign of any of these effects.
- Diabetes patients – Lasix can affect your blood sugar level. Closely monitor blood sugar levels. Ask your doctor before changing the dose of your diabetes medicine.
- Tell your doctor or dentist that you take Lasix before you receive any type of medical or dental care, urgent care, or surgery.
- Your doctor may also prescribe a potassium supplement while you are taking Lasix. Check with your doctor before using a salt substitute or other product that contains potassium.
- Lasix is a strong diuretic. Excessive use of this medicine can cause serious loss of water and minerals. Therefore, it is important that your doctor monitor you. Notify your doctor immediately if you experience extreme thirst, dry mouth, confusion, or muscle cramps/weakness.
- Patients taking medication for high blood pressure often feel tired or down for a few weeks after starting treatment. Be sure to take your medicine even if you don't feel "normal." Tell your doctor if you develop any new symptoms.
- If you have high blood pressure
- Caution is advised when using Lasix in children; they may be more sensitive to its effects.
- Pregnancy and breast-feeding: If you become pregnant