1. If you notice any of the symptoms listed below or any other symptoms which seem severe/persistent contact your doctor immediately.
2. Lower back/side pain/ muscle pain/weakness/cramps/tiredness.
3. Ringing in the ears/ dizziness/light-headedness.
4. Severe stomach pain/stomach upset/pain.
5. Tingling/numbness in the hands or feet.
6. Dry mouth/fever/chills/sore throat.
7. Increased sensitivity to the sun.
8. Yellowing of the eyes/skin.
9. Unusual bleeding/bruising.
10. Blood in urine/stool.
11. Irregular heartbeat.
12. Loss of appetite.
13. Increased thirst.
14. Mood changes.
15. Hearing loss.
16. Headache.
17. Vomiting.
18. Skin rash.
19. Diarrhea.
20. Nausea.

Inform your doctor if you are allergic to the formulation of this medication or any other medication in any other form.
Keep all appointments with your doctor and all follow up tests.
Whilst on a course with this medication your skin may become more sensitive to the sun/ultraviolet rays.

Furosemide comes as a tablet and liquid to take by mouth. It usually is taken once a day in the morning or twice a day in the morning and afternoon. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take furosemide exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.
Furosemide controls high blood pressure but does not cure it. Continue to take furosemide even if you feel well. Do not stop taking furosemide without talking to your doctor.

Generic lasix acts quickly, usually within 1 hour. However, since blood pressure declines gradually, it may be several weeks before you get the full benefit of Lasix; and you must continue taking it even if you are feeling well. Lasix does not cure high blood pressure; it merely keeps it under control.

Patients allergic to sulfa may also be allergic to furosemide because of a similarity in the chemical structure of the medications. Furosemide should be avoided in kidney failure. Even though furosemide is important in treating excess fluid accumulation in patients with cirrhosis, sudden loss of fluid and electrolytes in these patients can worsen kidney function and even cause the patient to go into a coma. Furosemide can cause lowering of blood potassium, sodium, and magnesium levels. Low potassium and magnesium levels can lead to heart rhythm abnormalities, especially in patients already taking digoxin (Lanoxin). Please visit the digoxin (Lanoxin) site for further information.

Blood uric acid levels can increase during furosemide treatment, but precipitation of acute gout is rare. Furosemide may increase the toxic effect of aminoglycoside antibiotics on the ear, especially in patients with kidney dysfunction. Furosemide reduces the kidney excretion of lithium and can lead to lithium toxicity. Furosemide may impair kidney function when administered together with aspirin or other nonsteroidal anti-inflammatory drugs (NSAIDs). Periodic blood tests are performed to monitor kidney function and electrolytes during treatment with furosemide.