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Euthyrox Side Effects

Common Euthyrox Side Effects


The most commonly reported Euthyrox side effects (click to view or check a box to report):

Headache (12)
Blood Thyroid Stimulating Hormone Increased (8)
Tachycardia (7)
Maternal Exposure During Pregnancy (7)
Weight Decreased (6)
Depression (6)
Blood Thyroid Stimulating Hormone Decreased (5)
Agitation (5)
Dizziness (5)
Dyspnoea (5)
Constipation (4)
Insomnia (4)
Abortion Induced (4)
Angina Pectoris (4)
Malaise (4)
Myocardial Infarction (4)
Vomiting (4)
Urticaria (4)
Nausea (4)
Muscle Spasms (4)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

Euthyrox Side Effects Reported to FDA

The following Euthyrox reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.


The appearance of Euthyrox on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.
Mental Impairment, Myalgia, Arthralgia, Abdominal Pain Upper, Weight Increased, Crying, Night Sweats, Amnesia
This is a report of a 59-year-old female patient (weight: NA) from DK, suffering from the following symptoms/conditions: myxoedema, who was treated with Euthyrox (dosage: NA, start time: Nov 15, 2010), combined with: NA. and developed a serious reaction and side effect(s). The consumer presented with:
  • Mental Impairment
  • Myalgia
  • Arthralgia
  • Abdominal Pain Upper
  • Weight Increased
  • Crying
  • Night Sweats
  • Amnesia
which developed after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Euthyrox treatment in female patients, resulting in mental impairment side effect.

Blood Thyroid Stimulating Hormone Increased, Incorrect Dose Administered
This report suggests a potential Euthyrox Blood Thyroid Stimulating Hormone Increased, Incorrect Dose Administered side effect(s) that can have serious consequences. A 87-year-old male patient (weight: NA) from ES was diagnosed with the following symptoms/conditions: NA and used Euthyrox (dosage: 75 Mcg 2 In 1 D) starting 201301. Soon after starting Euthyrox the patient began experiencing various side effects, including:
  • Blood Thyroid Stimulating Hormone Increased
  • Incorrect Dose Administered
Drugs used concurrently: NA. Although Euthyrox demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as blood thyroid stimulating hormone increased, may still occur.

Atrial Fibrillation
This Atrial Fibrillation problem was reported by a health professional from DE. A 58-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: post procedural hypothyroidism. On Feb 01, 2014 this consumer started treatment with Euthyrox (dosage: NA). The following drugs were being taken at the same time: NA. When commencing Euthyrox, the patient experienced the following unwanted symptoms/side effects:
  • Atrial Fibrillation
The patient was hospitalized.Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as atrial fibrillation, may become evident only after a product is in use by the general population.

Blood Thyroid Stimulating Hormone Increased, Product Counterfeit, Maternal Exposure During Pregnancy
This is a report of a 58-year-old female patient (weight: NA) from RU. The patient developed the following symptoms/conditions: hypothyroidism and was treated with Euthyrox 125 (levothyroxine Sodium) (tablet) (levothyroxine Sodium),151276 (dosage: 1/2 Tablet) starting 201312. Concurrently used drugs: NA.Soon after that, the consumer experienced the following side effects:
  • Blood Thyroid Stimulating Hormone Increased
  • Product Counterfeit
  • Maternal Exposure During Pregnancy
This opens a possibility that Euthyrox 125 (levothyroxine Sodium) (tablet) (levothyroxine Sodium),151276 treatment could cause the above reactions, including blood thyroid stimulating hormone increased, and some female subjects may be more susceptible.


Laryngeal Dyspnoea
A 58-year-old female patient (weight: NA) from DE with the following symptoms/conditions: hypothyroidism started Euthyrox treatment (dosage: NA) on Dec 18, 2013. Soon after starting Euthyrox treatment, the subject experienced various side effects, including:
  • Laryngeal Dyspnoea
Concurrently used drugs:
  • L-thyroxine
This finding indicates that some female patients could be more vulnerable to Euthyrox.

Convulsion, Muscle Spasms, Eye Swelling, Tri-iodothyronine Increased, Thyroxine Increased
A 36-year-old female patient from CN (weight: NA) experienced symptoms, such as: thyroidectomy and was treated with Euthyrox(dosage: NA). The treatment was initiated on 201310. After that a consumer reported the following side effect(s):
  • Convulsion
  • Muscle Spasms
  • Eye Swelling
  • Tri-iodothyronine Increased
  • Thyroxine Increased
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Euthyrox efficacy:
  • Calcium (calcium) (tablets) (calcium)


Anxiety, Suicidal Ideation, Depression, Cardiac Arrest, Chest Pain, Dyspnoea, Disability, Memory Impairment
In this report, Euthyrox was administered for the following condition: hypothyroidism.A 28-year-old female consumer from DK (weight: NA) started Euthyrox treatment (dosage: NA) on Oct 28, 2010.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Anxiety
  • Suicidal Ideation
  • Depression
  • Cardiac Arrest
  • Chest Pain
  • Dyspnoea
  • Disability
  • Memory Impairment
A possible interaction with other drugs could have contributed to this reaction: NA.The patient was hospitalized.Establishing a causal relationship between a specific drug and consumer's side effects is complex, but it is possible that in this report Euthyrox treatment could be related to the listed above side effect(s).

Ocular Hyperaemia, Eye Haemorrhage, Tongue Paralysis, Chest Discomfort, Oedema Mouth, Headache
This is a report of the following Euthyrox side effect(s):
  • Ocular Hyperaemia
  • Eye Haemorrhage
  • Tongue Paralysis
  • Chest Discomfort
  • Oedema Mouth
  • Headache
A 78-year-old female patient from DE (weight: NA) presented with the following condition: thyroidectomy and received a treatment with Euthyrox (dosage: (75 Mcg)) starting: NS.The following concurrently used drugs could have generated interactions:
  • Novothyral ((1, 3/4, 1/2))
The patient was hospitalized.This report suggests that a Euthyrox treatment could be associated with the listed above side effect(s).

Thyroid Cancer, Dizziness, Eye Swelling, Headache, Arrhythmia, Insomnia
This Euthyrox report was submitted by a 74-year-old female consumer from CN (weight: NA). The patient was diagnosed with: thyroid cancer and Euthyrox was administered (dosage: 50 Mcg (50 Mcg, 1 In 1 D), Oral) starting: 200705. The consumer developed a set of symptoms:
  • Thyroid Cancer
  • Dizziness
  • Eye Swelling
  • Headache
  • Arrhythmia
  • Insomnia
Other drugs used simultaneously: NA.Those unexpected symptoms could be linked to a Euthyrox treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Subdural Haematoma, Constipation, Blood Pressure Diastolic Decreased, International Normalised Ratio Increased, Abdominal Discomfort, Haematocrit Decreased, Haemoglobin Decreased, Platelet Count Decreased, White Blood Cell Count Decreased
This is a report of a possible correlation between Euthyrox 175 Mcg use and the following symptoms/side effect(s):
  • Subdural Haematoma
  • Constipation
  • Blood Pressure Diastolic Decreased
  • International Normalised Ratio Increased
  • Abdominal Discomfort
  • Haematocrit Decreased
  • Haemoglobin Decreased
  • Platelet Count Decreased
  • White Blood Cell Count Decreased
which could contribute to an assessment of Euthyrox 175 Mcg risk profile.A 61-year-old female consumer from ES (weight: NA) was suffering from hypothyroidism,atrial fibrillation and was treated with Euthyrox 175 Mcg (dosage: (175 Mcg , 1 In 1 D) Oral (levothyroxine Sodium) (levothyroxine Sodium)) starting 2011.Other concurrent medications:
  • Aldocumar
  • Furosemide
  • Metamizol Magnesium) (metamizole Magnesium) (metamizole Magnesium)
  • Ameride Amiloride Hydrochloride) (moduretic) (hydrochlorothiazide,amiloride Hydrochloride)
The patient was hospitalized.

Convulsion, Urinary Tract Infection
A 20-year-old female patient from CH (weight: NA) presented with the following symptoms: hypothyroidism,depression and after a treatment with Euthyrox (dosage: NA) experienced the following side effect(s):
  • Convulsion
  • Urinary Tract Infection
The treatment was started on 201304. Euthyrox was used in combination with the following drugs:
  • Bupropion
  • Desvenlafaxine
  • Abilify (aripirazole)
The patient was hospitalized.This report could alert potential Euthyrox consumers.

Product Counterfeit, No Therapeutic Response, Maternal Exposure During Pregnancy
In this report, a 22-year-old female patient from RU (weight: NA) was affected by a possible Euthyrox side effect.The patient was diagnosed with NA. After a treatment with Euthyrox (dosage: 100 Mcg, start date: NS), the patient experienced the following side effect(s):
  • Product Counterfeit
  • No Therapeutic Response
  • Maternal Exposure During Pregnancy
The following simultaneously used drugs could have led to this reaction: NA.The findings here stress that side effects should be taken into consideration when evaluating a Euthyrox treatment.

Respiratory Distress, Hypoaesthesia Oral, Palatal Oedema, Uvulitis, Malaise
This is a report of a 66-year-old female patient from US (weight: NA), who used Euthyrox (dosage: NA) for a treatment of autoimmune thyroiditis. After starting a treatment on 2012, the patient experienced the following side effect(s):
  • Respiratory Distress
  • Hypoaesthesia Oral
  • Palatal Oedema
  • Uvulitis
  • Malaise
The following drugs could possibly have interacted with the Euthyrox treatment NA.Taken together, these observations suggest that a Euthyrox treatment could be related to side effect(s), such as Respiratory Distress, Hypoaesthesia Oral, Palatal Oedema, Uvulitis, Malaise.

Abdominal Pain, Hypoaesthesia, Palpitations, Insomnia, Night Sweats, Lactose Intolerance
This abdominal pain side effect was reported by a consumer or non-health professional from DE. A 74-year-old female patient (weight:NA) experienced the following symptoms/conditions: hypothyroidism. The patient was prescribed Euthyrox (dosage: NA), which was started on 2004. Concurrently used drugs:
  • Simvastatin (simvastatin) (simvastatin)
When starting to take Euthyrox the consumer reported the following symptoms:
  • Abdominal Pain
  • Hypoaesthesia
  • Palpitations
  • Insomnia
  • Night Sweats
  • Lactose Intolerance
The patient was hospitalized. These side effects may potentially be related to Euthyrox.

Weight Decreased
This is a Euthyrox side effect report of a 47-year-old female patient (weight:NA) from ES, suffering from the following symptoms/conditions: hypothyroidism,weight control, who was treated with Euthyrox (dosage:25 Mcg Cada 24 Horas, start time: Jun 01, 2013), combined with:
  • Bio Three
, and developed a serious reaction and a weight decreased side effect. The patient presented with:
  • Weight Decreased
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Euthyrox treatment in female patients suffering from hypothyroidism,weight control, resulting in weight decreased.

Angina Pectoris, Feeling Cold, Gait Disturbance, Vertigo, Hypoglycaemia, Hypotonia, Alopecia, Dry Skin
This report suggests a potential Euthyrox angina pectoris side effect(s) that can have serious consequences. A 69-year-old female patient from DE (weight:NA) was diagnosed with the following health condition(s): autoimmune thyroiditis and used Euthyrox (dosage: NA) starting NS. Soon after starting Euthyrox the patient began experiencing various side effects, including:
  • Angina Pectoris
  • Feeling Cold
  • Gait Disturbance
  • Vertigo
  • Hypoglycaemia
  • Hypotonia
  • Alopecia
  • Dry Skin
Drugs used concurrently:NA. Although Euthyrox demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as angina pectoris, may still occur.

Liver Injury
This liver injury problem was reported by a consumer or non-health professional from CN. A 32-year-old female patient (weight: NA) was diagnosed with the following medical condition(s): thyroidectomy.On 200611 a consumer started treatment with Euthyrox (dosage: NA). The following drugs/medications were being taken at the same time: NA. When commencing Euthyrox, the patient experienced the following unwanted symptoms /side effects:
  • Liver Injury
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as liver injury, may become evident only after a product is in use by the general population.

Heart Rate Irregular, Chest Discomfort, Dyspnoea, Fluid Retention, Dizziness, Muscle Contracture, Myalgia, Arthralgia, Headache
This is a Euthyrox side effect report of a 58-year-old female patient (weight: NA) from SE. The patient developed the following symptoms/conditions: hypothyroidism and was treated with Euthyrox (dosage: 1 Df (100 Mcg,per Day)) starting Apr 12, 2013. Concurrently used drugs:
  • Behepan (cyanocobalamin) (cyanocobalamin)
Soon after that, the consumer experienced the following of symptoms:
  • Heart Rate Irregular
  • Chest Discomfort
  • Dyspnoea
  • Fluid Retention
  • Dizziness
  • Muscle Contracture
  • Myalgia
  • Arthralgia
  • Headache
This opens a possibility that Euthyrox could cause heart rate irregular and that some female patients may be more susceptible.

Anti-thyroid Antibody Positive, Hypophagia, Weight Decreased, Arrhythmia, Restlessness, Hyperhidrosis, Vomiting, Initial Insomnia
A 60-year-old female patient (weight: NA) from CN with the following symptoms: NA started Euthyrox treatment (dosage: 1-1/4 Tablet (50mcg, 1 In 1 D)) on Jul 20, 2013. Soon after starting Euthyrox treatment, the consumer experienced several side effects, including:
  • Anti-thyroid Antibody Positive
  • Hypophagia
  • Weight Decreased
  • Arrhythmia
  • Restlessness
  • Hyperhidrosis
  • Vomiting
  • Initial Insomnia
. Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Euthyrox side effects, such as anti-thyroid antibody positive.

Pemphigus, Skin Atrophy, Pemphigoid, Hypothyroidism
This pemphigus side effect was reported by a consumer or non-health professional from CH. A 42-year-old female patient (weight:NA) experienced the following symptoms/conditions: hypothyroidism,dyspepsia.The patient was prescribed Euthyrox (dosage: 75 Mcg (75 Mcg.), which was started on Oct 17, 2012. Concurrently used drugs:
  • Pantoprazole
.When starting to take Euthyrox the consumer reported symptoms, such as:
  • Pemphigus
  • Skin Atrophy
  • Pemphigoid
  • Hypothyroidism
These side effects may potentially be related to Euthyrox.

Muscle Spasms, Alopecia, Restless Legs Syndrome, Musculoskeletal Discomfort, Anxiety, Diarrhoea, Restlessness, Weight Decreased, Fear
This is a report of a 46-year-old female patient (weight: NA) from DE, suffering from the following symptoms/conditions: fatigue,asthenia,fluid retention,hyperthyroidism, who was treated with Euthyrox (dosage: Half Tablet Per Day, start time: 201302), combined with: NA. and developed a serious reaction and side effect(s). The consumer presented with:
  • Muscle Spasms
  • Alopecia
  • Restless Legs Syndrome
  • Musculoskeletal Discomfort
  • Anxiety
  • Diarrhoea
  • Restlessness
  • Weight Decreased
  • Fear
which developed after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Euthyrox treatment in female patients, resulting in muscle spasms side effect. The patient was hospitalized.

Hypotension, Heart Rate Increased
This report suggests a potential Euthyrox Hypotension, Heart Rate Increased side effect(s) that can have serious consequences. A 31-year-old male patient (weight: NA) from CN was diagnosed with the following symptoms/conditions: thyroid cancer and used Euthyrox (dosage: NA) starting Aug 03, 2013. Soon after starting Euthyrox the patient began experiencing various side effects, including:
  • Hypotension
  • Heart Rate Increased
Drugs used concurrently:
  • Oryzanol (oryzanol) (oryzanol)
Although Euthyrox demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as hypotension, may still occur.

Hyperadrenalism
This Hyperadrenalism problem was reported by a consumer or non-health professional from DE. A 76-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Euthyrox (dosage: NA). The following drugs were being taken at the same time: NA. When commencing Euthyrox, the patient experienced the following unwanted symptoms/side effects:
  • Hyperadrenalism
Although all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as hyperadrenalism, may become evident only after a product is in use by the general population.

Autoimmune Thyroiditis, Pruritus, Alopecia, Ear Disorder, Ear Discomfort
This is a report of a 38-year-old female patient (weight: NA) from IL. The patient developed the following symptoms/conditions: hypothyroidism and was treated with Euthyrox (dosage: (50 Mcg,5 In 1 Wk)) starting 201202. Concurrently used drugs:
  • Omega 3 (fish Oil)
  • Complex B /00653501/
Soon after that, the consumer experienced the following side effects:
  • Autoimmune Thyroiditis
  • Pruritus
  • Alopecia
  • Ear Disorder
  • Ear Discomfort
This opens a possibility that Euthyrox treatment could cause the above reactions, including autoimmune thyroiditis, and some female subjects may be more susceptible.

Musculoskeletal Discomfort, Thyroid Disorder, Chest Discomfort, Feeling Abnormal
A 74-year-old female patient (weight: NA) from DE with the following symptoms/conditions: autoimmune thyroiditis started Euthyrox treatment (dosage: NA) on NS. Soon after starting Euthyrox treatment, the subject experienced various side effects, including:
  • Musculoskeletal Discomfort
  • Thyroid Disorder
  • Chest Discomfort
  • Feeling Abnormal
Concurrently used drugs: NA. This finding indicates that some female patients could be more vulnerable to Euthyrox.

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Keep Track of Side Effects

Note Your Observations

It is really important to keep of your symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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