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Review: could Synthroid cause A-fib (Atrial fibrillation/flutter)?

We study 88,863 people who have side effects while taking Synthroid from FDA and social media. Among them, 1,661 have A-fib. Find out below who they are, when they have A-fib and more.

Get connected: join a mobile support group for people who take Synthroid and have A-fib >>>

Synthroid

Synthroid (latest outcomes from 93,669 users) has active ingredients of levothyroxine sodium. It is often used in hypothyroidism.

A-fib

A-fib (most common type of arrhythmia) (latest reports from 389,490 patients) has been reported by people with high blood pressure, osteoporosis, rheumatoid arthritis, diabetes, multiple myeloma.

On Oct, 13, 2014: 88,863 people reported to have side effects when taking Synthroid. Among them, 1,661 people (1.87%) have A-fib.

Trend of A-fib in Synthroid reports

Time on Synthroid when people have A-fib * :

< 1 month1 - 6 months6 - 12 months1 - 2 years2 - 5 years5 - 10 years10+ years
A-fib18.42%7.89%13.16%2.63%15.79%7.89%34.21%

Gender of people who have A-fib when taking Synthroid * :

FemaleMale
A-fib74.61%25.39%

Age of people who have A-fib when taking Synthroid * :

0-12-910-1920-2930-3940-4950-5960+
A-fib0.00%0.00%0.00%0.25%1.59%3.44%17.14%77.57%

Severity of A-fib when taking Synthroid ** :

leastmoderateseveremost severe
A-fib0.00%61.54%38.46%0.00%

How people recovered from A-fib ** :

while on the drugafter off the drugnot yet
A-fib25.00%12.50%62.50%

Top conditions involved for these people * :

  1. Atrial fibrillation (203 people, 12.22%)
  2. Hypothyroidism (156 people, 9.39%)
  3. Osteoporosis (142 people, 8.55%)
  4. Hypertension (115 people, 6.92%)
  5. Thyroid disorder (96 people, 5.78%)

Top co-used drugs for these people * :

  1. Coumadin (505 people, 30.40%)
  2. Aspirin (500 people, 30.10%)
  3. Lasix (496 people, 29.86%)
  4. Digoxin (375 people, 22.58%)
  5. Potassium chloride (266 people, 16.01%)

* Approximation only. Some reports may have incomplete information.

** Reports from social media are used.

Comments for this study:

Kathy Kessinger (2 years ago):

I have been on Synthroid or over 8 years. I have been in and out of AFIB for this same time. I have experienced strange heart beats with Synthroid and sleep problems.

I had two long bouts with AFIB and I was taking 225 mg of Synthroid a day. After getting out of the hospital I lowered my does of Synthroid to 150. I did not go into Afib for 6 months.

I then switched to a new drug Armour. I like it but my lab work does not show my T4 is high enough. So we added Synthroid back to my daily meds. I take Armour 120 mg and 25 mg of Synthroid.

I am back in and out of AFib again.

My doctors think it is the T3 in Armour that irritates my AFIB, I think it is Synthroid.

Is there any other way (but Synthroid) to get T4 in your system
Reply the comment

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

Do you have A-fib while taking Synthroid?

Get connected! Join a mobile support group:
- support group for people who take Synthroid and have A-fib
- support group for people who take Synthroid
- support group for people who have A-fib

Comments from related studies:

  • From this study (9 hours ago):

  • Continue to have intermittent tachycardia/flutter

    Reply

  • From this study (1 month ago):

  • Kevin Peters Ph.d on Mar, 4, 2013:

    Sammy, I'm a white 45 male; just wanted to agree on that Klonopin remark. When I was 21 I had my second kidney transplant which was a BAD issue all together, at any rate the hospital did not include my medications taken at home after my surgery. I went thru the worst hallucinations and jerking and seizures you could ever possibly imagine. This went on for almost 3 1/2 weeks before we decided to have me taken OUT of the hospital and relocated before they ended up taking my life. Then the whole staff of paychology including the chief of psychiatry cane in my room to see what they could do, Finallu. During one of my few moments of clarity the C.O.F after blaming me if talking "drugs" prior to my transplant listened to my word of telling him the meds I was on before being admitted. After asking when was the last time I had received my Klonopin and me not knowing, he then reviewed the charts, and didn't see me receiving this med once. He stormed out of the room of about 9 docs and came back in with two Klonopin; for the first time in almost 4 weeks and after three surgeries the first 72 hours I was hospitalized, I was sleeping like a baby, for about 49 hours with NO MORE hallucinations, or seizures or jerking! I finally got out of there without a kidney since that kidney was supposed to go to another man named the same as I in a different city! I do take Xanax and probably always will. The half life on Klonopin is much different hence one if its dangers, Nevwr Ever stop this drug cold! I've been on dialysis 25 1/2 years now and suffered from intense skin cancers, but have fought and done all I can do to live a normal as possible life, working full time except when I'm in yet another surgery, over 32 general anesthetic procedures since 1987. I was the youngest boy-man to ever be on the USA soccer team ready to play in the Korea 1988 Olympics. What a change in life.....
    All the Best,
    K. Peters

    Reply

    chris on Jun, 4, 2011:

    i have been taking clonzepam and trazedone and my speech is a very hoarse voice, I am wondering if if my speech problem is from these drugs's side effects.

    Reply

    TwoDimes on Apr, 15, 2012:

    Upon occasion, I, too, have become hoarse and from the use of Klonopin. I was VERY hoarse when I tried to cold turkey off of 4mgs of Klonopin. I am now down to 1.5mgs per day and, still, (as I said, upon occasion, I become hoarse. I am sure that the use of Klonopin is the causative factor. - TwoDimes -

    Reply

    SammySushi on Jul, 10, 2012:

    Omigosh, never cold turkey clonopin, esp that high of a dose. My dad had a major seizure and hallucinations doing so.

    Reply

    Christophe on Nov, 13, 2012:

    Hello,
    I suffer from Hypothyroidism, High Cholesterol & Cancer survivor because of Zyprexa use and previously being prescribed Carbamezapine causing Thyroid damage. My best advice to you if you don't want Hypothyroidism is have regular blood tests, Thyroid damage can be undetected for up to 5 years with no symptoms found on regular blood tests prematurally. Make sure you buy iodised salt to use on food when eating this will help reduce your risk of getting Hypothyroidism. two signs of Hypothyriodism which the Carbamezapine & Zyprexa medication boxes labels wont tell you is if your face becomes puffed up, red or sun sensitive while taking these medications this is a sign of Hypothyroidism. It wont be found on your blood test but later on it could appear out of the blue. The other sign to look for is baldness or hair loss on your head, this is another symptom. I hope these comments will help you. You have to weight up the benefits and negatives taking medications if you decide to take these medicines or not. It depends on how you cope with the drug side effects.
    from Christophe

    Reply

    AUDREY on Dec, 16, 2012:

    STARTED TAKING DILTIAZEM 60 MG AND I AM VERY CONSTIPATED. 70 YEARS OLD, HEART SURGERY A FAST HEART RATE....

    Reply

    Sonya on Feb, 24, 2013:

    You definately need to take a stool softener...straining during defication can cause major problems in people with cardiac problems.

    Reply

    Stillaguamish on Sep, 6, 2014:

    My heart breaks for you and I'm so sorry you had to go through all that. I recently had two surgeries and was outraged at hospital treatment. I had to demand my regular meds and when they gave in, they only gave me 3 of 6

    Reply

  • From this study (11 months ago):

  • Do not tolerate blood pressure meds well. Fainted on labetalol while driving.

    Reply

Post a new comment    OR    Read more comments

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More reviews for: Synthroid, A-fib

On eHealthMe, Synthroid (levothyroxine sodium) is often used for hypothyroidism. Find out below the conditions Synthroid is used for, how effective it is, and any alternative drugs that you can use to treat those same conditions.

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NOTE: The study is based on active ingredients and brand name. Other drugs that have the same active ingredients (e.g. generic drugs) are NOT considered.

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