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Levothyroxine and Hair Loss: What Users Say

Brand names: Synthroid, Tirosint, Euthyrox, Levoxyl, Unithroid, Eltroxin, Levo-T, Tirosint-Sol, Eutroxsig, Thyquidity, Levolet Ermeza Novothyrox Evotrox …show all brand names

Hair loss: mentioned by 108 users (12.4%)

Based on user experiences from 873 Levothyroxine reviews, the following table shows the most commonly mentioned side effects.

All user comments are moderated by Drugs.com. Each review is verified for relevance and screened for inappropriate content. Side effects are user-reported and not clinically verified.

tiredness 13.9%
hair loss 12.4%
fatigue 11.9%
weight gain 11.2%
headaches 9.0%
anxiety 8.4%
insomnia 7.9%
depression 7.1%
heart palpitations 6.6%
brain fog 6.5%

Reviews for Levothyroxine

Commonly mentioned side effects
  • And...
  • Taken for 1 to 6 months
  • January 18, 2019

Levothyroxine for Underactive Thyroid "I’ve been on Tirosint for 3 months now. The best I’ve felt in YEARS! I previously posted in October and I can only say if the other various thyroid medications are making you feel awful, YOU HAVE TO TRY TIROSINT! My energy level is fabulous, losing weight, no hair loss, coherent, etc, and overall LIVING LIFE to the FULLEST."

10 / 10
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385 Report
  • NAa...
  • September 8, 2020

Levothyroxine for Underactive Thyroid "Walmart switched my levothyroxine to Euthyrox. The first day, I had a headache almost at migraine level. Within two weeks, my hair was falling out, insomnia every night. I have been on levothyroxine for 12 years with no issues. Do not take this medication."

1 / 10
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237 Report
  • Won...
  • Taken for 10 years or more
  • February 16, 2019

Levothyroxine for Underactive Thyroid "I was on Synthroid for 10 years. I was in so much pain in my joints, I couldn't function. This is a known side effect of this medicine. My numbers were where they were supposed to be per the doctors, but I still felt tired and my hair was still falling out. After my husband and I did research, we worked with my doctor and switched to Armour Thyroid. Within 6 weeks my pain was gone, I felt better. I wasn't tired and my hair was falling out. No matter what medicine you use - you know how you should feel. Do the research and work with your doctor. Only you know how you should feel. Don't depend on the doctor to tell you."

1 / 10
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279 Report

Frequently asked questions

  • Kir...
  • Taken for less than 1 month
  • August 18, 2020

Levothyroxine for Underactive Thyroid "Please don't take Euthyrox if you are switching from Levothyroxine, after taking for a month. My hair were falling like crazy, loose stool and lot more side effects. Please think twice before taking Euthyrox."

1 / 10
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198 Report
  • Anonymous
  • Taken for 1 to 6 months
  • August 27, 2020

Levothyroxine for Underactive Thyroid "My pharmacy changed me to this brand after being on levothyroxine. My hair has been falling out, weight gain, brittle nails, and more side effects. This does not work for your thyroid. Had my TSH done in March, and it was pretty close to the normal range. After that, the pharmacy changed my levothyroxine to this one. My TSH is low, and this is why I am having the issues. I am upset that the pharmacy can just change things without checking with you first. Don't take this brand of medication."

1 / 10
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  • mls...
  • Taken for less than 1 month
  • December 5, 2019

Levothyroxine for Hashimoto's disease "This drug is causing all kinds of awful issues. My hair is falling out, I'm completely exhausted, want to sleep all day/night, can't think straight, can't make it through my work day, loose stools, headaches, cold. Increased heart palpitations. I feel exactly as I did when I wasn't taking anything."

1 / 10
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121 Report
  • Paw...
  • Taken for 2 to 5 years
  • April 18, 2018

Levothyroxine for Hashimoto's disease "Had my thyroid removed 2 years ago. Was put on Synthroid and have felt terrible ever since. Weight gain, joint and muscle pain, blurred vision, tremors, hair loss, constipation, irregular heartbeat, stomach problems, and the list goes on. Doctor tells me my numbers are fine, and I should be put on an antidepressant. Really. That's because they don't know enough about thyroid disease and keep pushing the drugs. This drug is next to poison, but no one listens to us. We are held hostage to these doctors that don't care. Where do we turn to because we are suffering. Help!"

1 / 10
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136 Report

More FAQ

  • Jen...
  • Taken for less than 1 month
  • October 27, 2021

Levothyroxine for Underactive Thyroid "I was on Nature Throid for 13 years with no problems until they stopped manufacturing it. I tried Armour and experienced anxiety! I switched to Levothyroxine and have been in the dumps, suffering from upper back and neck pain ever since. Recently, I switched to Tirosint, my hair immediately started falling out, and I was having severe hot flashes. I stopped taking it, and both issues resolved, so now I just take Levo every other day. I'm not sure why these manufacturers cannot figure it out when there are so many people suffering. Please, someone manufacture Nature Throid again. I am at a loss."

6 / 10
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76 Report
  • DCG...
  • Taken for 5 to 10 years
  • June 28, 2020

Levothyroxine for Hypothyroidism, After Thyroid Removal "I went on Tirosint when Levoxyl stopped working after they changed the formulary. It worked great until March or so of this year. Now my hair is falling out, I’ve gained 8 lbs., my temp is 96, I’m exhausted, etc. Because of the pandemic, I didn’t figure it out right away. Obviously hypothyroidism and I’m so bummed. Awaiting test results and a consult with my doctor. What did they do to Tirosint? Synthroid or Levoxyl don’t work for me. What do I do next? What a nightmare."

1 / 10
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90 Report
  • hap...
  • October 14, 2011

Levothyroxine for Hypothyroidism, After Thyroid Removal "I've had my thyroid removed 10 months ago, and I started taking the lowest dose of Levothyroxine (generic) six weeks after the surgery. I had my blood work done and dosage adjusted every six weeks until I ended up at 137 mcg daily, 5 months after the surgery. Then I switched to Synthroid brand. All this adjusting was done by an endocrinologist. I feel great, definitely much better than before the surgery when I suffered from severe hyperthyroidism. I did gain some weight right after the surgery, but once the dosage was correct, I was able to lose the pounds easily. All of my other symptoms (hair loss, abnormal sweating, fatigue) were gone once the dosage was correct. The right dosage is extremely important."

10 / 10
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199 Report
  • ire...
  • October 27, 2011

Levothyroxine for Underactive Thyroid "I have been on Synthroid for about 7 years. I am 43 now, but I still feel very tired and have no energy or motivation. My bones feel weak. I have been telling my doctor that maybe I need a higher dosage, but he said no. I suggested changing the medication, but he insisted I am fine. But I know my body. My hair is falling out, it's thin. Maybe a new doctor can help me."

4 / 10
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193 Report
  • ire...
  • October 27, 2011

Levothyroxine for Underactive Thyroid "I have been on Synthroid for about 7 years. I am 43 now, but I still feel very tired and have no energy or motivation. My bones feel weak. I have been telling my doctor that maybe I need a higher dosage, but he said no. I suggested changing the medication, but he insisted I am fine. But I know my body. My hair is falling out, it's thin. Maybe a new doctor can help me."

4 / 10
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193 Report
  • Hyp...
  • Taken for 10 years or more
  • November 23, 2019

Levothyroxine for Underactive Thyroid "I am a 57-year-old woman who has hypothyroidism. I've been taking 100mcg of Synthroid for 10 years. I dread taking this pill every morning. I feel like I have an out-of-body experience, blood rushes to my brain, causing anxiety, hair loss, muscle and joint pains, itching all over, brain fog, and insomnia. For the past week, I have been cutting it in half. I will be stopping this crazy cycle. I have lost so much weight just from the anxiety and insomnia. I do not want to have to rely on a synthetic pill and Klonopin, and be told I am depressed. I feel better without it."

4 / 10
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102 Report
  • Hyp...
  • March 19, 2016

Levothyroxine for Underactive Thyroid "Personally, I really like Tirosint better than any other thyroid medication I've taken. I was on Armour for 3 months and started to lose my hair, and my nails got very thin. Then, I switched to Synthroid hoping that my hair would stop falling out, but it only got worse. After a month on Synthroid, I lost at least half my hair. So I talked to my doctor, and we switched me to Tirosint, and after 3 weeks of using it, my hair has barely fallen out! I personally have had no harmful side effects with Tirosint, and I am glad I switched. Yes, it may be a little pricey a month, but it's totally worth not having my hair fall out!"

10 / 10
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116 Report
  • LJL...
  • Taken for less than 1 month
  • August 8, 2020

Levothyroxine for Hashimoto's disease "This drug has many side effects that I am experiencing: labored breathing, hair loss, blurred vision, fatigue, chest pain, heart skipping beats, nausea, and insomnia. I was taking a little oblong yellow levothyroxine that worked great, but the drug store changed companies, and this pill is round and white."

1 / 10
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64 Report
  • Anonymous
  • January 18, 2011

Levothyroxine for Hypothyroidism, After Thyroid Removal "I was put on Synthroid after having my thyroid removed due to cancer 6 years ago. I think I've been put on every dosage there is. I have not felt the same since. I'm always tired, I wake up wanting to rip someone's head off, armpits sweat horribly, cry over nothing, depressed, hair loss, always colder or hotter than people around me, no energy, etc. But when I talk to my doctor and explain my issues, I'm told that I'm fine. (I beg to differ, needless to say I'm going to see a new doctor next visit.) Though I'm sure Synthroid is a wonderful medication, it just doesn't seem to be working for me in my opinion... my doctor seems to think differently."

6 / 10
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148 Report
  • And...
  • October 10, 2018

Levothyroxine for Underactive Thyroid "I have Graves' disease and took RAI (radioactive iodine (I-131)) to treat the disease, which means now I have to top up my thyroid levels. I've previously taken Levoxyl, Synthroid, and lastly Armour. I always felt miserable with Levoxyl and Synthroid, which is why for the last three years I was taking Armour. Within the last year of taking Armour, I've had terrible inflammation, joint pain, anxiety, insomnia, hair loss, dry skin, weight gain, and the list goes on. It was coincidental that I forgot to take an Armour pill and realized how in one day all my symptoms went away. The next day I took my Armour and they all returned. It was so bad that I couldn't even bend my knees. I was miserable! I've been reading about Tirosint for the last few months, and my endo was more than accommodating to let me try it. WOW! What a difference! I'm not as hungry, losing weight, no anxiety, sleeping through the night, and overall just feeling great, as I've never had thyroid issues. However, I did have some heart palpitations last night. I'm going to get my lab work done today, as I feel the dosage may be too high."

10 / 10
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81 Report
  • Deb...
  • January 7, 2014

Levothyroxine for Hypothyroidism, After Thyroid Removal "I had my thyroid irradiated in 2005 due to Graves' disease caused by Hep C treatment (Ribavirin & Interferon). At first, I saw an endocrinologist that prescribed Armour Thyroid, but loss of job and insurance forced me to go to a free clinic, where I received Synthroid. The clinic doesn't seem to understand the difference between experiencing low thyroid levels from naturally occurring hypothyroidism and complete loss of thyroid. My NP says to me, incredulously, 'You take an awful lot of thyroid!', and at that time, I was only taking 75mcg a day. Finally, after three years of 75 to 100mcg, when I felt absolutely crazy (tired, confused, hair loss, cranky, paranoid, angry, enormous weight gain), she now has me on 150mcg which seems not perfect but better."

9 / 10
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135 Report
  • Peb...
  • Taken for 5 to 10 years
  • October 25, 2019

Levothyroxine for Underactive Thyroid "I do not notice any difference with the medicine. I’m still suffering from depression, and I have extreme hair loss and weight gain even if I don’t eat more than 1500 calories a day: high protein, low carbs."

1 / 10
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75 Report
  • bba...
  • Taken for less than 1 month
  • April 20, 2020

Levothyroxine for Underactive Thyroid "I have been on several thyroid medications for over 8 years. I was always tired, had fatigue, experienced hair loss, and extreme weight gain. I started Tirosint, and instantly I started feeling better."

10 / 10
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68 Report
  • Anonymous
  • March 5, 2010

Levothyroxine for Hypothyroidism, After Thyroid Removal "I had my thyroid removed almost a year ago, and I can agree that while I have not lost any weight using this drug, I have not gained any either. I have had horrible mood swings and lost a great deal of my hair. My doctor refuses to change the dosage because she says 'I'm within normal range' - whatever that means. I do feel like I'm experiencing memory loss or having problems concentrating."

5 / 10
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141 Report
  • Oli...
  • September 14, 2015

For Underactive Thyroid "I've been taking levothyroxine for a week and a half now, and before it, I would fall asleep at work, when I was driving, or just watching TV. There was a time that I went through 5 different sleep medications in 2 months to try and figure out the right one because nothing was working for me. My whole body ached, and worst of all, my hair was falling out. The first couple of days taking the medication, my body ached really bad, but it got better. I lost 12 pounds already, and my hair stopped falling out. I am also able to get through the day without falling asleep, and because I don't fall asleep during the day, I get tired during the night! I love it."

8 / 10
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90 Report
  • I...
  • Taken for 2 to 5 years
  • August 19, 2012

Levothyroxine for Hypothyroidism, After Thyroid Removal "My wife has been taking this medication for about 5 years now. She has terrible paranoia, is always in a bad mood, has sleep problems, hair loss, and irritation. Her doctor tests her levels all the time and tells her she is fine. However, I do not agree! She goes out drinking when she gets upset."

2 / 10
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117 Report
  • Akj...
  • August 14, 2020

Levothyroxine for Hashimoto's disease "Started this Euthyrox about a month ago after Walmart switched me to it. Since then, I’m having daily headaches, sometimes migraines, more hair loss, and fatigue. Called Walmart, and they switched me back to my previous manufacturer with no problem. This brand didn’t work for me."

3 / 10
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43 Report
  • miz...
  • December 30, 2016

Levothyroxine for Hypothyroidism, After Thyroid Removal "I ended up with an emergency complete thyroidectomy after an ultrasound revealed the tumors (2 in each lobe of my thyroid) had grown and were the culprit for me having to turn my head to the left to swallow food or even drink liquid. After years of taking levothyroxine, I was put onto the brand name Synthroid. At worst, my levels were 86.4. Yes, you read that correctly. My hair falls out in clumps, I feel tired, exhausted, have body aches and joint pain, and chronic fatigue, etc. Now my routine is to take my Synthroid at bedtime with vitamin C. I wake up fine, I'm down from 325 to 181, and I feel great! Please remember your thyroid takes weeks/months to change, you won't notice anything three days to a month into taking this."

10 / 10
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67 Report

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Reviews may be edited to correct grammar/spelling or remove inappropriate content. Reviews appearing to come from parties with a vested interest are not published. This information is not intended to endorse any medication and should not replace the expertise and judgment of healthcare professionals.