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This is an index of reports of adverse events (side effects, adverse reactions, etc.) related to Synthroid (Levothyroxine). Click on the relevant link below to view a selection of reports according to the event's seriousness level and/or the nature of the side effect / adverse reaction. Or scroll down to view a sample of recent reports further on this page.
Our database includes reports from Jan 2007 to Dec 2007. The information is not vetted and should not be cosidered as verified clinical evidence.
All cases (95)
Cases resulting in a serious event (77)
Cases resulting in death (7)
Cases resulting in life threatening events (2)
Cases resulting in hospitalization (32)
Cases resulting in disability (1)
Cases resulting in other serious reactions (47)
Below is a sample of reports where side effects / adverse reactions may be related to Synthroid (Levothyroxine). For a complete list and/or a specific selection of reports, please use the links in the index above.
Adverse event in 90 year old male receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-10-29
Patient: 90 year old male
Adverse reactions / side effects: Haemoglobin Decreased, Myelodysplastic Syndrome, Platelet Count Decreased, Renal Failure Chronic, Disease Progression
Adverse event resulted in: death, hospitalization
Suspect drug(s):
Revlimid
Dosage: 5 mg, 1 in 1 d, oral
Administration route: Oral
Indication: Myelodysplastic Syndrome
Start date: 2007-04-20
End date: 2007-06-08
Synthroid
Dosage: qd
Indication: Drug USE FOR Unknown Indication
Other drugs received by patient: Aranesp; Coreg; Lasix
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-10-23
Patient: female, weighing 66.7 kg (146.7 pounds)
Adverse reactions / side effects: Nasopharyngitis, Sinus Disorder, Coronary Arterial Stent Insertion, Cough
Adverse event resulted in: hospitalization
Suspect drug(s):
Alprazolam
Indication: Feeling of Relaxation
Amlodipine
Synthroid
Other drugs received by patient: Toprol-XL; Glyburide; Acetylsalicylic Acid SRT
Adverse event in 67 year old female receiving Synthroid (Levothyroxine)
Reported by a individual with unspecified qualification from United States on 2007-10-18
Patient: 67 year old female, weighing 54.5 kg (120.0 pounds)
Adverse reactions / side effects: Confusional State, Blood Cholesterol Increased, Thyroid Disorder, Coordination Abnormal, Amnesia
Suspect drug(s):
Neurontin
Dosage: 1600 mg (400 mg, 4 in 1 d)
Indication: Neuropathy Peripheral
Start date: 2003-01-01
Lipitor
Indication: Blood Cholesterol Increased
Start date: 2004-01-01
Synthroid
Indication: Thyroid Disorder
Start date: 2004-01-01
Lamictal
Start date: 2006-01-01
Other drugs received by patient: Haldol
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-10-18
Patient: female, weighing 63.6 kg (139.8 pounds)
Adverse reactions / side effects: Weight Increased, Breast Swelling, Psychomotor Hyperactivity, Oedema Peripheral, Insomnia, Abnormal Behaviour, Abdominal Distension, Blood Glucose Increased
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Administration route: Oral
Indication: Hypothyroidism
Start date: 1989-01-01
End date: 2002-01-01
Synthroid
Administration route: Oral
Start date: 2002-01-01
End date: 2003-01-01
Synthroid
Administration route: Oral
Start date: 2007-01-01
Other drugs received by patient: Sinemet
Adverse event in 62 year old female receiving Synthroid (Levothyroxine)
Reported by a physician from Dominican Republic on 2007-10-16
Patient: 62 year old female
Adverse reactions / side effects: Myalgia, Rheumatoid Arthritis, Hypersensitivity, Dyspepsia, Underdose, Nodule ON Extremity
Adverse event resulted in: disablity
Suspect drug(s):
Synthroid (Levothyroxine)
Other drugs received by patient: Verapamil Hydrochloride; Disgren
Adverse event in 90 year old male receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-10-16
Patient: 90 year old male
Adverse reactions / side effects: Haemoglobin Decreased, Myelodysplastic Syndrome, Platelet Count Decreased, Disease Progression
Adverse event resulted in: death, hospitalization
Suspect drug(s):
Revlimid
Dosage: 5 mg, 1 in 1 d, oral
Administration route: Oral
Indication: Myelodysplastic Syndrome
Start date: 2007-04-20
End date: 2007-06-08
Synthroid
Dosage: qd
Indication: Drug USE FOR Unknown Indication
End date: 2007-07-13
Other drugs received by patient: Aranesp; Coreg; Lasix
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-10-09
Patient: female
Adverse reactions / side effects: Malaise, Therapeutic Response Unexpected With Drug Substitution
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in male receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-10-05
Patient: male, weighing 86.3 kg (189.8 pounds)
Adverse reactions / side effects: Myalgia, Blood Thyroid Stimulating Hormone Increased, Thyroid Disorder, Muscle Spasms
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Administration route: Oral
Indication: Hypothyroidism
Start date: 1994-01-01
Synthroid
Start date: 2004-08-12
Other drugs received by patient: Lisinopril
Adverse event in 36 year old female receiving Synthroid (Levothyroxine)
Reported by a health professional (non-physician/pharmacist) from United States on 2007-10-05
Patient: 36 year old female, weighing 127.9 kg (281.4 pounds)
Adverse reactions / side effects: Fatigue, Diarrhoea, Nausea, Drug Intolerance, Pharmaceutical Product Complaint
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a health professional (non-physician/pharmacist) from United States on 2007-10-05
Patient: female
Adverse reactions / side effects: Atrial Flutter, Atrial Fibrillation, Blood Thyroid Stimulating Hormone Increased
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Administration route: Oral
Indication: Hypothyroidism
Start date: 1957-01-01
End date: 2007-09-28
Synthroid
Administration route: Oral
Start date: 2007-09-28
Other drugs received by patient: Furosemide; Cyanocobalamin; Amlodipine; Nitroglycerin; Mendelamine; Ascorbic Acid; Ferex; Alprazolam; Docusate Sodium; Levetiracetam; Aspirin
Adverse event in 81 year old female receiving Synthroid (Levothyroxine)
Reported by a individual with unspecified qualification from United States on 2007-10-04
Patient: 81 year old female, weighing 60.0 kg (132.0 pounds)
Adverse reactions / side effects: Fatigue, Pain in Extremity, Amnesia
Suspect drug(s):
Femara
Dosage: 2.5 mg, unk
Administration route: Oral
Indication: Breast Cancer
Start date: 2006-06-01
Synthroid
Other drugs received by patient: Zocor; Fosamax
Adverse event in receiving Synthroid (Levothyroxine)
Reported by a pharmacist from United States on 2007-07-31
Patient:
Adverse reactions / side effects: Surgery, Vomiting, Nausea
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Indication: Drug USE FOR Unknown Indication
General Anesthesia
Indication: Drug USE FOR Unknown Indication
Adverse event in 42 year old female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-30
Patient: 42 year old female, weighing 81.6 kg (179.6 pounds)
Adverse reactions / side effects: Pharmaceutical Product Complaint
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-26
Patient: female, weighing 59.0 kg (129.7 pounds)
Adverse reactions / side effects: Irritability, Mood Altered
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in male receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-19
Patient: male, weighing 86.3 kg (189.8 pounds)
Adverse reactions / side effects: Myalgia, Blood Thyroid Stimulating Hormone Increased, Thyroid Disorder, Muscle Spasms
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Administration route: Oral
Indication: Hypothyroidism
Start date: 1994-01-01
Synthroid
Synthroid
Synthroid
Other drugs received by patient: Lisinopril
Adverse event in receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-18
Patient:
Adverse reactions / side effects: Drug Withdrawal Syndrome, DRY Skin
Suspect drug(s):
Levoxyl
Administration route: Oral
Synthroid
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-07-17
Patient: female, weighing 102.3 kg (225.1 pounds)
Adverse reactions / side effects: Wrist Fracture, Atrial Fibrillation, Hand Fracture, Tongue Disorder, Muscle Injury, Muscle Disorder, Muscle Spasms, RIB Fracture
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid
Administration route: Oral
Indication: Hormone Suppression Therapy
Start date: 2003-01-01
End date: 2003-07-01
Synthroid
Administration route: Oral
Indication: Post Procedural Hypothyroidism
Start date: 2003-07-01
End date: 2006-03-01
Synthroid
Administration route: Oral
Indication: Thyroid Cancer
Start date: 2002-12-01
End date: 2002-12-01
Synthroid
Administration route: Oral
End date: 2006-05-09
Other drugs received by patient: Thyroid TAB
Adverse event in 43 year old female receiving Synthroid (Levothyroxine)
Reported by a individual with unspecified qualification from United States on 2007-07-16
Patient: 43 year old female, weighing 81.6 kg (179.6 pounds)
Adverse reactions / side effects: Blood Triglycerides Abnormal, DRY Skin, Headache, Pyrexia, Weight Increased, Fatigue, Mood Altered, Chest Pain, Insomnia, Immune System Disorder
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in male receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-07-16
Patient: male, weighing 81.7 kg (179.8 pounds)
Adverse reactions / side effects: Psychomotor Hyperactivity, Dyspepsia, Heart Rate Increased, Arrhythmia, Faeces Discoloured, Lethargy
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid (Levothyroxine)
Other drugs received by patient: Omeprazole; Heart Medication; Toprol-XL
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-13
Patient: female, weighing 77.2 kg (169.8 pounds)
Adverse reactions / side effects: Blood Thyroid Stimulating Hormone Increased, Nasal Septum Deviation, Epistaxis
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-07-10
Patient: female, weighing 65.3 kg (143.7 pounds)
Adverse reactions / side effects: Weight Increased, Fatigue, Alopecia, Pharmaceutical Product Complaint
Suspect drug(s):
Synthroid (Levothyroxine)
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-09
Patient: female, weighing 60.8 kg (133.7 pounds)
Adverse reactions / side effects: Pharmaceutical Product Complaint, Thyroid Function Test Abnormal
Suspect drug(s):
Synthroid
Dosage: take 1 tablet by mouth daily once a day po
Administration route: Oral
Indication: Hypothyroidism
Start date: 2007-03-06
End date: 2007-06-10
Synthroid
Dosage: take 1 tablet by mouth daily once a day po
Administration route: Oral
Indication: Hypothyroidism
Start date: 2007-06-11
End date: 2007-06-25
Adverse event in 64 year old female receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from Brazil on 2007-07-09
Patient: 64 year old female, weighing 115.0 kg (253.0 pounds)
Adverse reactions / side effects: Uterine Cancer, Alopecia
Suspect drug(s):
Synthroid (Levothyroxine)
Other drugs received by patient: Atenolol; Diclofenac
Adverse event in 62 year old male receiving Synthroid (Levothyroxine)
Reported by a consumer/non-health professional from United States on 2007-07-03
Patient: 62 year old male
Adverse reactions / side effects: Blood Glucose Decreased, Drug Ineffective, Stomach Discomfort, Blood Glucose Abnormal, Blood Glucose Increased
Suspect drug(s):
Symlin
Dosage: 120 mcg; sc 60 mcg; sc
Indication: Type 2 Diabetes Mellitus
Start date: 2007-03-01
End date: 2007-03-16
Symlin
Dosage: 120 mcg; sc 60 mcg; sc
Indication: Type 2 Diabetes Mellitus
Start date: 2007-03-17
Humalog
Dosage: sc
Indication: Type 2 Diabetes Mellitus
Levemir
Dosage: 100 units;qpm;sc
Indication: Type 2 Diabetes Mellitus
Fish OIL
Dosage: po
Administration route: Oral
Indication: Blood Cholesterol Increased
End date: 2007-03-21
Aspirin
Dosage: po
Administration route: Oral
Indication: Blood Cholesterol Increased
End date: 2007-03-21
Synthroid
Dosage: po
Administration route: Oral
Indication: Thyroid Disorder
Protonix
Dosage: po
Administration route: Oral
Indication: Gastric Disorder
Adverse event in female receiving Synthroid (Levothyroxine)
Reported by a physician from United States on 2007-07-03
Patient: female
Adverse reactions / side effects: Haemorrhage
Adverse event resulted in: hospitalization
Suspect drug(s):
Synthroid (Levothyroxine)
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