This is an index of side effect / adverse reaction reports (a.k.a. adverse event reports) related to Levothroid (Levothyroxine) and submitted to the FDA during the sample period of about a year. The information is not vetted and should not be considered as verified clinical evidence.
Reports by Event Outcome
All Cases (33)
Death (5)
Life Threatening Events (5)
Disability (6)
Reports by Reaction Type
Blood Pressure Increased (8),
Hypertensive Crisis (7),
Drug Ineffective (6),
Dyspnoea (6),
Labile Hypertension (5),
Urinary Incontinence (5),
Headache (5),
Overdose (5),
Completed Suicide (5),
Cough (5),
Blood Potassium Increased (5),
Bronchitis (5)
Below are a few examples of reports where side effects / adverse reactions may be related to Levothroid (Levothyroxine). For a complete list or a specific selection of reports, please use the links above.
Possible Levothroid side effects in
Reported by a health professional (non-physician/pharmacist) from United States on 2012-08-13
Patient:
Reactions: Vitamin D Deficiency, Polymyalgia Rheumatica, Femur Fracture, Palpitations, Adverse Event, Cardiac Failure Congestive, Chondropathy, Bowel Movement Irregularity, Pain in Extremity, Anaemia, Coronary Artery Disease, Hallucination, Visual, Aspartate Aminotransferase Increased, Ventricular Tachycardia, Stress Fracture, Drug Ineffective, Restless Legs Syndrome, Fall, Gastric Ulcer, Hypercholesterolaemia, Depression, Acute Myocardial Infarction, RIB Fracture, Decreased Appetite, Supraventricular Extrasystoles, Nausea, Urinary Tract Infection, Hyponatraemia, Post Herpetic Neuralgia, Meniscus Lesion, Anxiety, Feeling Abnormal, Hypertension, Leukocytosis
Adverse event resulted in: hospitalization, disablity
Drug(s) suspected as cause:
Fosamax
Dosage: 70 mg, unk
Administration route: Oral
Start date: 2006-02-22
End date: 2010-06-18
Alendronate Sodium
Dosage: 70 mg/kg, unk
Start date: 2009-11-21
Fosamax
Dosage: 70 mg, unk
Administration route: Oral
Indication: Osteoporosis
Start date: 2001-01-08
End date: 2004-12-01
Levothroid
Dosage: unk
Indication: Hypothyroidism
Start date: 1950-01-01
Other drugs received by patient: Benicar; Zocor; Sinemet
Possible Levothroid side effects in 78 year old female
Reported by a consumer/non-health professional from United States on 2012-08-09
Patient: 78 year old female, weighing 77.6 kg (170.7 pounds)
Reactions: Basedow's Disease, Pain in Extremity, Breast Disorder, Breast Mass, Osteopenia, Cataract Cortical, Hyperlipidaemia, Osteoarthritis, Hypothyroidism, Thyroid Disorder, Essential Hypertension, Hypertension
Drug(s) suspected as cause:
Aspirin
Administration route: Oral
Levothyroxine Sodium
Prilosec
Administration route: Oral
Crestor
Administration route: Oral
Levothroid
Crestor
Administration route: Oral
Cardizem CD
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-08-07
Patient: female
Reactions: Maternal Exposure During Pregnancy, Abortion Spontaneous, Infertility
Drug(s) suspected as cause:
Levothroid
Dosage: 50 mcg
Administration route: Oral
Indication: Hypothyroidism
Start date: 2011-05-01
End date: 2012-06-01
Levothroid
Dosage: 150 mcg
Administration route: Oral
Start date: 2012-06-01
End date: 2012-06-27
Possible Levothroid side effects in 53 year old female
Reported by a consumer/non-health professional from United States on 2012-08-02
Patient: 53 year old female
Reactions: Cardiac Flutter, Amnesia, Lethargy
Drug(s) suspected as cause:
Levothroid
Dosage: 75 mcg
Administration route: Oral
Indication: Hypothyroidism
Start date: 2005-01-01
Levothroid
Dosage: 75 mcg monday-saturday
Other drugs received by patient: Vitamin B-12; Vitamin D; Aspirin; Lisinopril; Ginkgo; M.v.i.; Vitamin E; Fish OIL; Ascorbic Acid
Possible Levothroid side effects in 54 year old male
Reported by a physician from United States on 2012-07-03
Patient: 54 year old male, weighing 95.0 kg (209.0 pounds)
Reactions: Atrial Fibrillation
Drug(s) suspected as cause:
Cytomel
Dosage: 100 mcg
Indication: Generalised Resistance To Thyroid Hormone
Levothroid
Dosage: 200 mcg
Indication: Generalised Resistance To Thyroid Hormone
Other drugs received by patient: Albuterol; Verapamil; Theophylline; Terazosin HCL
Possible Levothroid side effects in female
Reported by a pharmacist from United States on 2012-07-02
Patient: female, weighing 62.6 kg (137.7 pounds)
Reactions: Platelet Count Decreased
Drug(s) suspected as cause:
Cardizem CD
Dosage: 180 mg, daily
Levothroid
Dosage: 0.075 mg, daily
Indication: Thyroid Disorder
Aspirin
Dosage: 81 mg, daily
Indication: Cardiac Failure Congestive
Xanax
Dosage: 0.25 mg, as needed
Indication: Anxiety
Atrovent
Dosage: 0.5 mg, as needed
Indication: Chronic Obstructive Pulmonary Disease
Budesonide
Dosage: 0.25 mg, 2x/day
Indication: Chronic Obstructive Pulmonary Disease
Zyvox
Dosage: 600 mg, every 12 hours
Indication: Pneumonia
Start date: 2012-06-17
Celexa
Dosage: 20 mg, daily
Indication: Depression
Other drugs received by patient: Oxygen
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-06-21
Patient: female
Reactions: Dyspnoea, Hyperhidrosis, Tremor, Irritability, Anxiety, Menstrual Disorder, Diarrhoea, Insomnia, Heart Rate Increased, Nervousness
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Levothroid
Possible Levothroid side effects in 70 year old female
Reported by a physician from Spain on 2012-06-12
Patient: 70 year old female
Reactions: Eyelid Oedema, Arthralgia, Oedema Peripheral, Drug Interaction
Drug(s) suspected as cause:
Sycrest (Asenapine / 05706901 / ) 95 MG)
Dosage: 5 mg; bid; sl, 5 mg; qd; sl
Indication: Bipolar Disorder
Start date: 2012-05-01
End date: 2012-05-01
Levothroid
Indication: Hypothyroidism
Other drugs received by patient: Simvastatin; Lithium
Possible Levothroid side effects in 45 year old female
Reported by a consumer/non-health professional from United States on 2012-05-31
Patient: 45 year old female, weighing 79.4 kg (174.6 pounds)
Reactions: Disease Complication, Anxiety, Irritability, Hyperhidrosis, Nervousness
Drug(s) suspected as cause:
Levothroid
Possible Levothroid side effects in female
Reported by a health professional (non-physician/pharmacist) from United States on 2012-05-31
Patient: female, weighing 136.0 kg (299.2 pounds)
Reactions: Drug Level Fluctuating, Off Label Use, Thyroid Function Test Abnormal, Cardiac Disorder, Arrhythmia
Drug(s) suspected as cause:
Levothroid
Possible Levothroid side effects in female
Reported by a physician from United States on 2012-05-11
Patient: female
Reactions: Bipolar Disorder, Dizziness, Feeling Abnormal
Drug(s) suspected as cause:
Levothroid
Vitamin D
Xanax
Start date: 2010-01-01
Atrovent
Calcium
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-04-24
Patient: female
Reactions: Drug Level Fluctuating, Product Formulation Issue, Product Quality Issue, Arrhythmia
Drug(s) suspected as cause:
Levothroid
Synthroid
Dosage: 0.150 mg 1 per day ?
Indication: Autoimmune Thyroiditis
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-04-17
Patient: female
Reactions: Bipolar Disorder, Dizziness, Feeling Abnormal
Drug(s) suspected as cause:
Levothroid
Dosage: unk
Calcium
Dosage: unk
Vitamin D
Dosage: unk
Atrovent
Dosage: unk
Xanax
Dosage: unk
Start date: 2010-01-01
Possible Levothroid side effects in 57 year old female
Reported by a health professional (non-physician/pharmacist) from United States on 2012-04-05
Patient: 57 year old female, weighing 77.6 kg (170.6 pounds)
Reactions: Product Substitution Issue, Liver Function Test Abnormal, Blood Cholesterol Increased, Bradycardia, Thyroid Function Test Abnormal
Drug(s) suspected as cause:
Levothroid
Possible Levothroid side effects in 51 year old male
Reported by a physician from United States on 2012-04-04
Patient: 51 year old male
Reactions: Colon Cancer
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Clonidine
Indication: Product Used FOR Unknown Indication
Levothroid
Indication: Product Used FOR Unknown Indication
Norvasc
Dosage: 5 mg (5 mg, 1 in 1 d)
Indication: Product Used FOR Unknown Indication
Trazodone HCL
Indication: Product Used FOR Unknown Indication
Benazepril Hydrochloride
Indication: Product Used FOR Unknown Indication
Ambien
Indication: Product Used FOR Unknown Indication
Pravastatin
Indication: Product Used FOR Unknown Indication
Possible Levothroid side effects in male
Reported by a consumer/non-health professional from United States on 2012-03-29
Patient: male
Reactions: Colon Cancer
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Benazepril Hydrochloride
Levothroid
Dosage: unk
Ambien
Dosage: unk
Pravastatin
Clonidine
Dosage: unk
Norvasc
Dosage: 5 mg, 1x/day (1 tablet daily)
Trazodone HCL
Dosage: unk
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-03-28
Patient: female
Reactions: Blood Pressure Increased, Electrocardiogram Abnormal, Dizziness
Drug(s) suspected as cause:
Levothroid
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-03-22
Patient: female, weighing 65.4 kg (143.9 pounds)
Reactions: Blood Pressure Increased, Dyspnoea, Labile Hypertension, Drug Ineffective, Urinary Incontinence, Blood Potassium Increased, Headache, Hypertensive Crisis, Overdose, Bronchitis, Cough, Atrioventricular Block First Degree
Adverse event resulted in: life threatening event, hospitalization, disablity
Drug(s) suspected as cause:
Labetalol
Dosage: 1 df, qid
Levothroid
Dosage: 600 ug, unk
Administration route: Oral
Levothroid
Dosage: 300 ug, unk
Administration route: Oral
Gilenya
Dosage: 0.5 mg, qd
Administration route: Oral
Indication: Multiple Sclerosis
Start date: 2011-06-06
End date: 2011-11-04
Labetalol
Dosage: 1 df, q6h
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Zestril
Dosage: 10 mg, bid
Labetalol
Dosage: 900 mg, once/single
Administration route: Oral
Lopressor
Dosage: 50 mg, tid
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Cardizem LA
Dosage: unk ukn, unk
Indication: Coronary Artery Disease
Other drugs received by patient: Synthroid; Aldactone; Amitiza; Clonidine; Aldactone; Prozac; Prilosec; Vitamin D; Valium; Dyazide; Valium
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-03-22
Patient: female, weighing 65.4 kg (143.9 pounds)
Reactions: Blood Pressure Increased, Dyspnoea, Labile Hypertension, Drug Ineffective, Urinary Incontinence, Blood Potassium Increased, Headache, Hypertensive Crisis, Overdose, Bronchitis, Cough, Atrioventricular Block First Degree
Adverse event resulted in: life threatening event, hospitalization, disablity
Drug(s) suspected as cause:
Levothroid
Dosage: 300 ug, unk
Administration route: Oral
Levothroid
Dosage: 600 ug, unk
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Labetalol HCL
Dosage: 1 df, q6h
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Labetalol HCL
Dosage: 1 df, qid
Gilenya
Dosage: 0.5 mg, qd
Administration route: Oral
Indication: Multiple Sclerosis
Start date: 2011-06-06
End date: 2011-11-04
Lopressor
Dosage: 50 mg, tid
Administration route: Oral
Cardizem LA
Dosage: unk ukn, unk
Indication: Coronary Artery Disease
Labetalol HCL
Dosage: 900 mg, once/single
Administration route: Oral
Zestril
Dosage: 10 mg, bid
Other drugs received by patient: Prozac; Vitamin D; Synthroid; Aldactone; Valium; Valium; Prilosec; Clonidine; Aldactone; Dyazide; Amitiza
Possible Levothroid side effects in female
Reported by a health professional (non-physician/pharmacist) from United States on 2012-03-09
Patient: female, weighing 68.0 kg (149.7 pounds)
Reactions: Mental Impairment, Weight Increased, Dysarthria, Gait Disturbance
Drug(s) suspected as cause:
Levothroid
Start date: 2008-06-01
End date: 2010-03-01
Synthroid
Dosage: 75 mcg
Start date: 2010-03-01
Synthroid
Dosage: 50 mcg
Start date: 2008-04-01
End date: 2008-06-01
Other drugs received by patient: Naproxen; Iron; Lexapro
Possible Levothroid side effects in 51 year old male
Reported by a consumer/non-health professional from United States on 2012-02-15
Patient: 51 year old male
Reactions: Colon Cancer
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Ambien
Indication: Product Used FOR Unknown Indication
Norvasc
Dosage: 5 mg (5 mg, 1 in 1 d)
Indication: Product Used FOR Unknown Indication
Trazodone HCL
Indication: Product Used FOR Unknown Indication
Levothroid
Indication: Product Used FOR Unknown Indication
Pravastatin
Indication: Product Used FOR Unknown Indication
Benazepril Hydrochloride
Indication: Product Used FOR Unknown Indication
Clonidine
Indication: Product Used FOR Unknown Indication
Possible Levothroid side effects in male
Reported by a consumer/non-health professional from United States on 2012-02-10
Patient: male
Reactions: Colon Cancer
Adverse event resulted in: hospitalization
Drug(s) suspected as cause:
Ambien
Dosage: unk
Benazepril Hydrochloride
Norvasc
Dosage: 5 mg, 1x/day (1 tablet daily)
Pravastatin
Levothroid
Dosage: unk
Clonidine
Dosage: unk
Trazodone HCL
Dosage: unk
Possible Levothroid side effects in 87 year old female
Reported by a physician from United States on 2012-01-17
Patient: 87 year old female
Reactions: Completed Suicide, Respiratory Arrest, Cardiac Arrest
Adverse event resulted in: death
Drug(s) suspected as cause:
Nitroglycerin
Colchicine
Metoprolol Succinate Extended Release
Hydralazine HCL
Levothroid
Zolpidem
Alprazolam
Acetaminophen / Propoxyphene (Acetaminophen, Propoxyphene)
Possible Levothroid side effects in 74 year old female
Reported by a physician from United States on 2012-01-17
Patient: 74 year old female
Reactions: Completed Suicide, Respiratory Arrest, Cardiac Arrest
Adverse event resulted in: death
Drug(s) suspected as cause:
Risperidone
Levothroid
Simvastatin
Temazepam
Bumetanide
Hypocholorite (Sodium Hypochlorite)
Potassium Chloride
Carvedilol
Clopidogrel
Lisinopril
Possible Levothroid side effects in 51 year old female
Reported by a physician from United States on 2012-01-17
Patient: 51 year old female
Reactions: Completed Suicide, Respiratory Arrest, Cardiac Arrest
Adverse event resulted in: death
Drug(s) suspected as cause:
Levothroid
Beta Blocker (Nos) (Beta Blocker (Nos))
Benzodiazepine (Nos) (Benzosiazepine)
Bupropion HCL
Possible Levothroid side effects in 58 year old female
Reported by a physician from United States on 2012-01-17
Patient: 58 year old female
Reactions: Cardio-Respiratory Arrest, Completed Suicide
Adverse event resulted in: death
Drug(s) suspected as cause:
Antihyperlipidemic (Nos) (Antihyperlipidemic (Nos))
Levothroid
Calcium Antagoinst (Nos) (Calcium Antagonist (Nos))
Cardiac Glycoside (Nos) (Cardiac Glycoside (Nos))
Diphenhydramine HCL
Benzodiazepine (Nos) (Benzoediazepine (Nos)
Carprofen (Carprofen)
Possible Levothroid side effects in 53 year old female
Reported by a physician from United States on 2012-01-13
Patient: 53 year old female
Reactions: Completed Suicide, Respiratory Arrest, Cardiac Arrest
Adverse event resulted in: death
Drug(s) suspected as cause:
Fentanyl
Dosage: transdermal
Acetaminophen and Oxycodone HCL
Acetaminophen and Hydrocodone Bitartrate
Zolpidem
Carisoprodol
Alprazolam
Levothroid
Tolterodine Tartrate
Possible Levothroid side effects in female
Reported by a physician from United States on 2012-01-09
Patient: female, weighing 65.4 kg (143.9 pounds)
Reactions: Blood Pressure Increased, Dyspnoea, Labile Hypertension, Drug Ineffective, Urinary Incontinence, Blood Potassium Increased, Headache, Hypertensive Crisis, Overdose, Bronchitis, Atrioventricular Block First Degree, Cough
Adverse event resulted in: life threatening event, hospitalization, disablity
Drug(s) suspected as cause:
Lopressor
Dosage: 50 mg, tid
Administration route: Oral
Labetalol HCL
Dosage: 1 df, q6h
Administration route: Oral
Gilenya
Dosage: 0.5 mg, qd
Administration route: Oral
Indication: Multiple Sclerosis
Start date: 2001-06-06
End date: 2011-11-04
Gilenya
Indication: Demyelination
Levothroid
Dosage: 600 ug, unk
Administration route: Oral
Levothroid
Dosage: 300 ug, unk
Administration route: Oral
Labetalol HCL
Dosage: 900 mg, once/single
Administration route: Oral
Labetalol HCL
Dosage: 1 df, qid
Cardizem LA
Dosage: unk ukn, unk
Indication: Coronary Artery Disease
Clonidine
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Clonidine
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Zestril
Dosage: 10 mg, bid
Other drugs received by patient: Prozac; Amitiza; Synthroid; Valium; Dyazide; Aldactone; Valium; Prilosec; Clonidine; Vitamin D; Aldactone
Possible Levothroid side effects in female
Reported by a physician from United States on 2012-01-09
Patient: female, weighing 65.4 kg (143.9 pounds)
Reactions: Blood Pressure Increased, Dyspnoea, Labile Hypertension, Drug Ineffective, Urinary Incontinence, Blood Potassium Increased, Headache, Hypertensive Crisis, Overdose, Bronchitis, Atrioventricular Block First Degree, Cough
Adverse event resulted in: life threatening event, hospitalization, disablity
Drug(s) suspected as cause:
Lopressor
Dosage: 50 mg, tid
Administration route: Oral
Gilenya
Dosage: 0.5 mg, qd
Administration route: Oral
Indication: Multiple Sclerosis
Start date: 2001-06-06
End date: 2011-11-04
Levothroid
Dosage: 300 ug, unk
Administration route: Oral
Labetalol HCL
Dosage: 900 mg, once/single
Administration route: Oral
Labetalol HCL
Dosage: 1 df, qid
Gilenya
Indication: Demyelination
Labetalol HCL
Dosage: 1 df, q6h
Administration route: Oral
Cardizem LA
Dosage: unk ukn, unk
Indication: Coronary Artery Disease
Levothroid
Dosage: 600 ug, unk
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Zestril
Dosage: 10 mg, bid
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Other drugs received by patient: Amitiza; Prozac; Dyazide; Clonidine; Vitamin D; Aldactone; Aldactone; Valium; Synthroid; Valium; Prilosec
Possible Levothroid side effects in female
Reported by a consumer/non-health professional from United States on 2012-01-09
Patient: female, weighing 65.4 kg (143.9 pounds)
Reactions: Blood Pressure Increased, Dyspnoea, Drug Ineffective, Labile Hypertension, Urinary Incontinence, Blood Potassium Increased, Headache, Hypertensive Crisis, Overdose, Bronchitis, Atrioventricular Block First Degree, Cough
Adverse event resulted in: life threatening event, hospitalization, disablity
Drug(s) suspected as cause:
Labetalol HCL
Dosage: 1 df, qid
Lopressor
Dosage: 50 mg, tid
Administration route: Oral
Labetalol HCL
Dosage: 1 df, q6h
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Zestril
Dosage: 10 mg, bid
Levothroid
Dosage: 300 ug, unk
Administration route: Oral
Cardizem LA
Dosage: unk ukn, unk
Indication: Coronary Artery Disease
Gilenya
Dosage: 0.5 mg, qd
Administration route: Oral
Indication: Multiple Sclerosis
Start date: 2001-06-06
End date: 2011-11-04
Labetalol HCL
Dosage: 900 mg, once/single
Administration route: Oral
Catapres
Dosage: 0.1 mg, tid (prn)
Administration route: Oral
Gilenya
Indication: Demyelination
Levothroid
Dosage: 600 ug, unk
Administration route: Oral
Other drugs received by patient: Synthroid; Valium; Prilosec; Prozac; Aldactone; Amitiza; Valium; Aldactone; Dyazide; Clonidine; Vitamin D
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