Furosemide is a “loop” diuretic, meaning that it affects a special part of the kidney called the loop of Henle to facilitate salt elimination from the body along with extra fluid. This “water pill” not only kicks sodium out of the body (considered a beneficial action), it also promotes removal of other key minerals such as magnesium, potassium and calcium (an undesired consequence).


Q. As part of the medications I take for high blood pressure, I take Lasix two times per day, 40 mg each.
I am concerned as I just read that Lasix can potentially cause kidney damage or gout when taken over a period of time. I am very concerned that I have never been told about these serious side effects from my doctor. Are they true?

Q. My Husband’s doctor is concerned about his blood pressure. It has been fine until three days ago when at the doctor’s office it was 140/80. (When we got home it was 125/75). The doctor doubled his dose of furosemide.
I frankly am afraid he is going to end up in the hospital! I would like to learn more about this drug. My husband fortunately works close to home; he sometimes urinates on himself because he can’t always make it to the bathroom in time. He does operate heavy equipment at times and the dizziness thing is scary too. Please tell us more about furosemide.

I take prescribed 20 mg Lasix twice a day. One doctor says to take potassium with it, but another doctor says no. I don’t know what to do.

Q. My wife (54 years old) started furosemide 20 mg twice a day for fluid retention. It has helped with that, but has caused hearing loss in both ears. She has been told to stop for two weeks and see her doctor for blood work afterwards

Q. I have a very good friend who suffers from serious heart problems. He had a pacemaker implanted many years ago. That was replaced with a defibrillator pacemaker. He has been taking many medications for his heart problems, including furosemide (Lasix). He was diagnosed with diabetes about three years ago.
A few months ago, he was taken to the ER when he became very short of breath. They ran many tests and one doctor switched him from Lasix to torsemide (Demadex). Ever since this change, his blood sugar has been completely normal. Is diabetes a side effect of Lasix?


As you can see from the questions above, this diuretic is associated with a number of complications. Because it is a water pill (eliminates fluid from the body), it can cause numerous trips to the bathroom. As one reader reported above, it led to incontinence for her husband at work. Others complain that they have to get up numerous times a night to pee. More serious is dizziness. The same wife who worried that her husband had “accidents” at work also mentioned that he handled heavy equipment. The dizziness brought on by Lasix is very troublesome for someone in such a situation.
We also worry about depletion of potassium and magnesium. These electrolytes are essential for muscle function. When they are depleted from the body, muscle cramps are not an uncommon complication. Irregular heart rhythms can also occur and this can be a life-threatening situation if not corrected. Anyone on furosemide must have regular blood tests to make sure electrolytes don’t get out of whack. In some cases potassium and magnesium supplements are necessary, but they require medical supervision and close monitoring to make sure the levels are like Goldilocks and the porridge (not too hot or too cold…too much or too little).
Other concerns mentioned above include hearing loss, gout and diabetes. These complications are all linked to Lasix.
Here are some other side effects to be alert for:

• Weakness, muscle cramps (linked to electrolyte depletion)
• Dehydration
• Irregular heart rhythms (contact an MD immediately)
• Dizziness, low blood pressure, especially when standing suddenly
• Ringing in ears, hearing loss (contact an MD immediately)
• Blood problems (contact a physician if bruising or anemia occurs)
• Blurred vision
• Skin rash, itching (potentially life threatening, contact an MD immediately!)
• Elevated uric acid levels, gout
• Elevated blood sugar, diabetes
• Increases in cholesterol levels and triglycerides
• Kidney damage

No one should ever stop furosemide suddenly without medical supervision. This drug is essential for certain heart patients, especially those with congestive heart failure. Keeping excess fluid under control is critical for such patients. But furosemide is a tricky drug and requires very close monitoring by an attentive health care provider. The drug can also interact dangerously with dozens of other medications, so the pharmacist must check any other medicine that is taken to make sure there are no incompatibilities.


We have received a number of complaints that not all generic furosemide is created equal. We are especially worried about this problem for people with heart failure. If their medicine is not working as anticipated, it can lead to fluid accumulation and serious complications. We fear that the FDA has not been as vigilant about monitoring generic drugs as most health professionals think. Here are just a few stories for your consideration. If you suspect that your generic furosemide is not working as intended, let your physician and pharmacist know that this is a problem other people have encountered.

“I have mild congestive heart failure and real bad edema, with my left leg especially. I take 80 mg Lasix twice a day. The brand name works quite well. Some of the generic furosemide seems to work but it seems to have a wide range of effectiveness from manufacturer to manufacturer.
“The generic furosemide that my mail order pharmacy sends me seems to do little or nothing. I may as well be taking chalk tablets. On this stuff I retained so much water that I would gain about 15-20 lbs or more and have shortness of breath. My legs would swell up badly. I have to keep a Lasix prescription at the local pharmacy and pay for it out of my own pocket to avoid problems.”

“I take furosemide, 20 mg tablets, and for a long time took Mylan brand generic. Then the pharmacy switched me to brand XXX generic. I immediately began ‘drowning,’ and my weight jumped 5 lbs overnight. I fortunately had some Mylan brand still on hand, switched back, lost the water, and three days later tried the brand XXX again. Same result. I am on an assigned Medicare Part D Plan, and as a result the Mylan has to be special-ordered and approved for me to get it.
“These are both generic forms of the same drug, but even among generics there are big differences. A major concern is that while I recognized the problem and took immediate action (and then tested the problem out again), there are a lot of elderly people on furosemide, for instance, who would not understand this type of problem with the pill. They could end up seriously ill, with their doctors blaming them for ‘non-compliance’ problems: “Mrs. D is not taking her furosemide as directed,” when in fact it was the drug manufacturer at fault.”

Share your story about furosemide (Lasix) below. Has it worked well for you? Have you experienced any side effects? Have you had any problems with generic formulations?Others may benefit from your comments.

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  1. Annette
    United States

    My 82 year old mother has been on Lasix for two years. She has recently developed scaly, rash-type patches on her neck. After reading about the side affects of Lasix, she cut her dose in half and the rash went away.

    She is currently taking a generic (I think) form of Lasix 20mg, that is shaped like a football and has a “V” type symbol on it, with good results. Her pharmacy recently ran out of this manufacturer’s pills and substituted a small, round pill with different markings. Today she woke up and complained to me that she couldn’t breathe all night. The other pill worked much better, so there is a difference in efficacy between manufacturers.

    Now that I’m reading about all the side effects, like kidney failure and tinnitus, I think I would like to see her on another type of diuretic altogether. Thank you for this informative site.

  2. Peter S.

    I’m on medication to lower my blood pressure and heart problem. I’m taking Spironolactone once daily, loratan once daily, nifedifine twice daily, atenolol once daily, frusemide twice daily. My problem is after taking the above I feel a great pain from stomach at times I wont be able to walk. I consulted my doctor and he refered me for echo. I’m going for echo tomorrow please help.

  3. Phyllis Y.
    Reno, NV

    My brother is on Furosemide 20mg and after reading your stories it explains a lot of his problems. Thanks for the info. It helps me to understand many things. PJY…

  4. Demetrius
    San Francisco, CA

    I made a post about lasix also. Only to be hospitalized once again. What makes it so bad, They altered my medication which included raising my my lasix from 40 mg to eighty mg. I thought to myself oh my god I going to die for sure. Low and behold I haven’t been back to the hospital since.

  5. John

    I take 120 milligrams of lasix you want to talk about getting dizzy and blurred vision plus now I’ve been putting weights back on.

  6. Marilyn Wise
    United States

    I have congestive heart failure and am under hospice who give me 1 mg of Bumetanide and 12 1/2 mg of Spironolactone a day for extreme swelling and it has worked as I also drink a qt. of Tonic Water and eat several oranges a day for potassium. However, today I have taken the meds and still am very swollen and hardly urinating. Is this caused by low electrolytes or is it just a sign of dying? My last blood test a month ago showed electrolytes at O.K. levels after drinking the tonic (quinine) water. By the way, since drinking tonic, my terrible leg cramps have completely disappeared! I learned of this from my daughter who was in a large ballet company for years.

  7. Mashun

    So, is Lasix safe? With all of the side effects, I’m nervous!!!


    I’m in the 4th stage of emphysema. I was recently diagnosed with edema. I went to the E.R. where they said I had edema. They told me to have my PCP to prescribe lasix, which she did. It was 40 mg. and also prescribed pottasium 20. Well to make a long story short, I am also on lithium for being bi-polar. Well the lasix interacted with the lithium and I ended up in the hospital with severe dehydration and acute renal failure.

    I could have died as a result of the combination of the two medicines. Now I’m off the lithium but now take 300 mgs of serequel. I have called my PCP because I’m still holding water and I need to be on a duiretic. She has not called me with an answer as far as saying I can take the lasix now. My nerves are shot because of the fear of some kind of bad reaction. I’m at a loss of words wondering what to do. Maybe someone who reads this can give me an opinion. please.

    • People's Pharmacy

      The interaction you suffered could have been deadly; you are right. You need to have an expert who can check for interactions. Since your PCP has demonstrated she doesn’t do that carefully, ask for a consultation with a clinical pharmacist.

  9. carol k.

    just had generic foresimide changed by pharmacy and doesn’t work well am now working at finding prev type. know its not working on me.

  10. Debra T.

    I am having some major problems with this drug “Lasix” Or Better Yet the generic form called ” Furosemide” 20 mg 2x a day. I am also on Potassium. My Legs into my feet are cramping so badly that I have been miserable! They are like “Charlie Horses” And this is concerning to me because just 3 months ago I had an implant device PACEMAKER/DIFIB put in.

    Today I Contacted my pharmacy & asked the pharmacist if he knew what this could be from. He told me this is a side effect of Lasix and even though I’m drinking ALOT of water, he told me to drink gatorade asap. Electrolytes are out of whack! You have to do more than drink water~ Good Luck to all of you on this drug!

    • Demetrius
      San Francisco,CA

      Approx. 2-3 weeks ago I was giving a portable defib. temporary for 90 days.
      I’m diabetic, congestive heart failure just a host of things that is quite common, as I see just from reading the postings.

      Well, yesterday I had a very bad episode that was caused by Furosemide. The night before I was showering and recognized that I was retaining fluids as I took off my socks. At that point, I took one more Furosemide pill and continued on with my plans. We arrived at a hotel. I undressed and everything was fine. all of a sudden I got a cramp in my left leg, then my right, then I found myself on the ground crying unable to walk. HOW FREAKING EMBARRASSING!!!!! today I will call my doctor and request for some type of alternative option. Because I felt like a little wimp on the ground crying and yelling.

  11. S B

    I have been taking Furosemide for years but for the last 4 or so years I can’t go out because I can’t get shoes on my feet ankles legs are so big and heavy my knees are so big I can’t walk anywhere without pain and the cartilage keeps moving. My belly is so big I am like a rolypoly now need size 24 to go round me I really am ashamed of myself.
    I have ringing in my ears dizziness hair is falling out have no tears, can’t smell, eyes are sore and all, my teeth have fallen out. I have agoraphobia heart problems etc I am a mess I do wish I could get some help. regards Sandra B.

  12. AP

    I ws told by my oncologist to take Lasix for swelling ( I have multiple Myeloma) for three days only in a row and then stop to get rid of swelling in my feet and ankles. while on the Lasix i did not urinate more and after stopping my feet and ankles are more swollen then ever. I am not taking it again. Has anyone else had this problem?

  13. Jamie

    I have pitted edeama dr cant figu out why. Blood work and stress test ruled out any major thing but the past week my swelling is way worse cant wear shoes im hurting. The edeama is all over my face hands legs feet añd my pantz r tight .
    I take 40mg furosemide . dr dont seem to think raising dose will help but i have taken more here n there but no help but didn’t do it every day for any long stretch. Been on Furosemide for 4 months. Im 5.1 i am overweight my blood pressure is ok.
    I take Metformin 1000 a day. Im on 58mg methadone a day. No other health problems . Help i feel stuck also been tired and having headaches and nausea. The edeama is everywhere but feet & legs r worse . They r unbearable :(. I am over weight but usually carry it well. I look like a freak. Frustrated and feeling hopeless.

  14. S B

    I have been taking Furosemide for over 20years now. 80mg down to 20mg per day then up again then down again then took off them then on again besides 12 other medications my legs are and belly are so big I cannot get shoes on so I can’t go out at all now only to doctors or hospital in a pair of elasticated slippers. I can’t even get xxxxx width on.
    I was rushed in hospital with suspected heart attack. I have dizzy spells and can’t stand up for any length of time labrinthitis low then high blood pressure. Arthritis. IBS. Asthma. No sense of smell at all no tiers my teeth have dropped out. Hair is dropping out. Agoraphobia. Tinnitus so obviously no self esteem at all. I was on Warferine but they took it off me and gave me rivaroxaban I just feel a nuisance because doctors just haven’t got the time to spend any time with you anymore.
    Regards sandra

  15. Ginger

    My mom is 91 years old and was recently put on 80 mg of Lasik a day and she is still retaking. Legs are swollen, ringing in ears, tired don’t want to get up. Neuropathy in legs. Feet burning. She was on just 40 and the doctor raised to 40 more. Do I need to ask for Lasix and forget the generic?

  16. Marie S

    I was on furosimide for over a ear for swelling of feet, ankles, and legs,It just kept getting worse. I’m also on metoprolol for A-Fib. I thought the water pill should make the swelling go down, but no. Finally after getting rid of all meds one by one that I felt was causing this. There was only the furosimide left, so I asked my Dr. for prior Auth. for Lasix as it wasn’t on my formulary.
    It was approved, and after a couple of months, the swelling has gone away, I only take 20mg once a dasy and my body has been cramping terrible. I know what I have to eat, but being 81 yrs old and having to depend on someone to do shopping, I run out of O.J. and bananas, etc. and can’t get anyone to get them for me. So I just called Dr. to see what strength of potassium I can take, even though I don’t want to, but I may have no choice.

  17. BobbieB

    At the end of last year, I had a very bad cold and then a chest infection. Don’t know if it was the chest infection or antibiotics that turned me into a zombie but it took a lot of getting over. I have been experiencing shortness of breath for some time and this had got worse so mentioned it to my Dr. She put me on Furosemide, arranged blood test, chest Xray and Echo scan.
    I had a heart attack 5 years ago followed by triple by-pass. I have been told that my kidneys don’t have full function, now at stage 3. I take candesartan for high blood pressure + the usual meds for heart attack. Last week I had another blood test for kidney function. The Dr phoned to say stop taking Furosemide as kidneys have got worse.
    Recently my BP has been very low. Mostly below 110 over 56. How long before the water tablets are out of my system and can I hope my kidney function will return to the previous stage 3?
    Xray didn’t show any water on my lungs. Echo scan showed enlarged heart and left ventricle not resting as it should? I am 81 years old.
    Really hoping that the water pills haven’t done more permanent damage.

  18. Frank J

    I am grateful for the differing opinions. I take Furosimide 20 mg once a day, the truth of it is not yet clear, as I was taking 40 mg of Atorvastatin. I stopped taking that and feel better than I have in over a year. (Silent Heart attack 14 months ago) Standard treatment of 5 daily Meds.

  19. L.Leslie

    I had been on furosemide 40mg for about ten years. I was put on this medicine for high blood pressure and swelling of the legs and ankles. My doctor has retired and I was forced to find another doctor, who now has taken me off of furosemide. It has caused kidney damage also vertigo.
    If I had continued to take furosemide, I would now probably be pushing up daisies.

  20. Mary C.

    I took Lasix for many years and did develop gout. I’ve been taking Allopurinol ever since. I completely stopped the Lasix a couple of years ago. Do you think I could stop the Allopurinol?

  21. Elizabeth S.

    My mother is 91 and I live with her. She has severe pain from neuroprophy (sp) both legs knees down and terrible pain and swelling. She takes pain meds when swelling is at it’s height. 20 mg Lasix once day. Usually gets dizzy and has tinnitus even when not on water pill. Does Gatorade help with loss of salt and electrolytes? Drinking this, will it possibly keep these side effects at bay, since she is extreme fall risk? What other food or drink will or can assist with side effects, pls

  22. MJT

    I have congenital bilateral lymphedema and have taken 40mg of lasix 3x daily for decades as successful treatment for this condition. I maintain potassium levels effectively through diet and supplements. I have never been able to take the generic version of lasix as it simply never works – tried numerous times to no avail. A year and a half ago I had a partial pancreatectomy and splenectomy and in Nov had a total knee replacement.
    Everything went well for both until a few weeks after knee surgery when I broke out in hives that were difficult to treat and took 2 months and cortisone pack along with antihistimines to control. It just recently returned.
    After getting blood tests back that showed possible chronic kidney disease I started doing research and found that lasix may be a factor in the complexity of what is now happening. I don’t know how else to treat the lymphedema problem so that it is managed and not be impacted by the medication.
    I am a proponent for alternative health and take probiotics, digestive enzymes and get weekly acupuncture treatments that have helped tremendously.
    And I have a proactive and highly intelligent physician and am working with head of dermatology at Cleveland Clinic to treat recent rashes. Ultimately, this is a complex constellation of conditions that is a challenge in treating effectively.

  23. Ruthiez

    Hi. I was on Lasix (furosemide) for several years. I began taking it several years ago after I had severe, and painful, idiopathic edema in both legs. Since that time I have lost nearly 130 pounds (115 in the last 12 months), and requested my physician remove me from this and a couple other medications. She agreed, but now I have a problem. I had noticed before, when I would miss my morning meds, or take them a good bit later than normal, I had strange and uncomfortable side-effects, including the sensation of hot/cold cycling and general malaise. Last night I couldn’t sleep until I took some Benadryl and NyQuil to knock myself out. I am still slightly uncomfortable and have ringing in my ears. I don’t know how to make this better other than to 1) weather it out…oy… or 2) go back on the Lasix. I am the Queen of odd side-effects lol.

  24. kfor

    Some years ago I was hospitalized for two and a half months (part of the time in a coma) and was given Lasix to keep fluid retention at a minimum. I took it for a short while after coming home but then stopped. I now attribute my present problems to that time in the hospital.
    Shortly after coming home I developed ringing in BOTH ears at the same time, hearing loss in BOTH ears at the same time, prediabetes which developed into type-2 even after diet changes, and high uric acid levels which developed into gout.
    I have always been careful with my cooking and diet because my husband has high cholesterol and high blood pressure and it puzzled me that these things happened to me in a relatively short period of time.
    Thank heaven for both of you and your column. It helps tremendously to know that when I need to check on something I will often find the answer on your website [www.peoplespharmacy.com]. Thank you.
    Thank you for taking time to share such a thoughtful comment.

  25. LEW

    My husband took Furosimde for many years. We now know the Cardiologist who is caring for my husband was taking too many drugs that were not beneficial to him including Furosided. He was like a Zombie, just wanted to sit and do nothing.
    After this Cardiologist took my husband off this drug, plus others, plus prescribing something else and reducing the amounts in other drugs, he miraculously became alive again. He is now 86 years old, has survived two dangerous life threatening surgeries, including a heart replacement one. He is now very active and building things like he use to that he loved to do. Does many tasks and does not want to sleep all day, eats well and so many other things.
    I am hoping people who take this drug and many others that you have written about take heed and ask their Doctors to check their drugs out very carefully. When my husband had the heart surgery, he wasn’t recovering well, I found out that he was taking this and other drugs that he shouldn’t have been. Cardiologist immediately started checking out what I had found and was amazed that all those other Drs. were not checking his meds, dosage, etc.
    Once again Dr. Gradeon and Mr. Gradeon, Thanks for such a wonderful column and all the information you write about alerting and showing us so many natural remedies to use instead of harmful drugs. Sincerely, Mrs W.

  26. RKM, MD

    Furosimide also poses an increased risk for osteoporosis by its inhibition of calcium re-absorption.

  27. B.C.

    Dear Mr. & Mrs. Graedon: The information you give to all of us is priceless. You have saved an innumerable number of people, young and old,
    from many, many problems – The People’s Pharmacy News report is the only one I believe without question.
    I know you must sleep well at night.
    God bless . From a grateful Canadian.
    Dear B.C.
    You are so kind to take a few minutes out of your busy day to send us such a thoughtful message. It really means a lot and is what keeps us going.
    Joe & Terry

  28. D.S.

    I’m admittedly very overweight, but my BP at home runs between 120/70 and 130/80. However, at Dr office it’s usually much higher on the first take but lowers on the second one. Last fall Dr finally told me to talke lasix (have significant problems with most other BP meds he has prescribed). After being on generic lasix for a couple days I developed difficulty passing urine and my left ankle became extremely swollen. I quit taking the stuff and reported the same to the Doc.

  29. A.T.

    Diagnosed with CHF and on Medicare, I was given generic Lasix, known as furosemide. Over time, this led to copious amounts of fluid retention in my abdomen and a terminal prognosis. My physical discomfort was only relieved through paracentesis (having the fluid manually drained by the hospital’s radiologist) once every two weeks, along with discontinuing all medication. After six months of this treatment, I no longer retained fluid, followed a strict low-sodium diet, and now I feel fine.

  30. Mark

    Before I retired as a pharmacist, the two generic drugs that I received the most complaints about were generic Lasix and generic Ritalin.

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