When blood levels of thyroid hormone are too low, doctors prescribe thyroid medication. If a person takes too much thyroid medication, the result is the same as if the person has hyperthyroidism, a natural form of thyroid hormone overproduction. Thyroid hormone affects nearly every tissue in the body, so too much thyroid hormone medication speeds up the entire system, according to Drugs.com. Symptoms of a thyroid medication overdose range from mild to fatal, depending on the amount of medication taken.
An overdose of thyroid medication increases heart rate, according to eMedTV.com 1. This can lead to an irregular heart beat. Irregular heart beat can lead to a dangerous condition called fibrillation, which is one type of heart attack. Another symptom of overdose is palpitations. Palpitations are sensations that the heart is skipping a beat. This can be very uncomfortable and cause anxiety. With a higher overdose, increased blood pressure and heart attack may follow, according to MedlinePlus 2. Chest pains may accompany any of these symptoms.
Side Effects of Too Much Armour Thyroid
Thyroid medication overdose may cause an increase in appetite, according to Drugs.com. Depending on the amount of the overdose, it can also cause nausea. Even with an increase in appetite, a prolonged overdose of thyroid medicine may result in weight loss, according to the American Thyroid Association. Too much thyroid hormone increases the metabolism, which causes a person to burn more calories than they would with a normal level of thyroid hormone. Unless the person eats more calories to compensate for the higher metabolism, the result will be a loss of weight. Some persons try to lose weight using thyroid hormone supplementation. This is a dangerous practice because thyroid hormone has a narrow therapeutic index. This means that the difference between an effective dose and a toxic dose is very small; this is why when a person is on thyroid medication, doctors frequently check thyroid hormone levels.
- Thyroid medication overdose may cause an increase in appetite, according to Drugs.com.
- Even with an increase in appetite, a prolonged overdose of thyroid medicine may result in weight loss, according to the American Thyroid Association.
An overdose of thyroid medication has far-reaching effects on the brain and nerves. Psychologically, an overdose can cause:
- according to eMedTV.com 1
Since an increase of thyroid hormone speeds up the entire body, it becomes difficult to relax. An overdose nearly always causes insomnia. At higher dosages, the effect can be shock, stroke, coma or even death as the accelerated nerve impulses become more and more discordant.
- An overdose of thyroid medication has far-reaching effects on the brain and nerves.
- At higher dosages, the effect can be shock, stroke, coma or even death as the accelerated nerve impulses become more and more discordant.
Drugs & Foods to Avoid for Hypothyroidism
Even though one would think extra thyroid hormone medication would make a person feel stronger, thyroid medication overdose causes muscular fatigue and weakness, according to MedlinePlus 2. This is caused by an inability to relax and rest the body. The muscles become tense and eventually fatigue using up all their available chemical energy. Muscular tremors often accompany muscular fatigue from thyroid overdose.
- Even though one would think extra thyroid hormone medication would make a person feel stronger, thyroid medication overdose causes muscular fatigue and weakness, according to MedlinePlus 2.
- Muscular tremors often accompany muscular fatigue from thyroid overdose.
An overdose of thyroid medication can cause fever, according to MedlinePlus 2. The increased metabolism caused by the overdose generates extra heat in the body. The person may feel hot when others are cold. An individual who takes too much thyroid medication will experience an intolerance to heat and his skin may be flushed. He may also experience excess sweating as his body tries to cool itself down to a normal temperature.
- An overdose of thyroid medication can cause fever, according to MedlinePlus 2.
- An individual who takes too much thyroid medication will experience an intolerance to heat and his skin may be flushed.
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- eMedTV: Synthroid Overdose
- MedlinePlus: Thyroid Preparation Overdose
- American Thyroid Association. General Information/Press Room.
- Pirahanchi Y, Jialal I. Physiology, Thyroid Stimulating Hormone (TSH). In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2019 Jan-. Updated April 25, 2019.
- AACC. Hashimoto Thyroiditis. Lab Tests Online. Updated October 18, 2019.
- DeGroot LJ. Graves’ Disease and the Manifestations of Thyrotoxicosis. [Updated 2015 Jul 11]. In: Feingold KR, Anawalt B, Boyce A, et al., editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2015.
- Nguyen QT, Lee EJ, Huang MG, Park YI, Khullar A, Plodkowski RA. Diagnosis and treatment of patients with thyroid cancer. Am Health Drug Benefits. 2015;8(1):30-40.
- Bindra A, Braunstein GD. Thyroiditis. Am Fam Physician. 2006;73(10):1769-76.
- Medeiros-Neto G. Multinodular Goiter. In: Feingold KR, Anawalt B, Boyce A, et al., editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000-. Updated September 26, 2016.
- The National Institute of Diabetes and Digestive and Kidney Diseases. Hypothyroidism (Underactive Thyroid). Published August 2016.
- The National Institute of Diabetes and Digestive and Kidney Diseases. Hyperthyroidism (Overactive Thyroid). Published August 2016.
- Brent GA. Environmental exposures and autoimmune thyroid disease. Thyroid. 2010;20(7):755-61. doi:10.1089/thy.2010.1636
- Mcaninch EA, Bianco AC. The history and future of treatment of hypothyroidism. Ann Intern Med. 2016;164(1):50-6. doi:10.7326/M15-1799
- The National Institute of Diabetes and Digestive and Kidney Diseases. Grave’s Disease. Published September 2017.
- Stagnaro-Green, A., Abalovich, M, Alexander, E. et. al. Guidelines of the American thyroid association for the diagnosis and management of thyroid disease during pregnancy and postpartum. Thyroid. 2011(21)10. doi:10.1089/thy.2011.0087
- Liu G, Liang L, Bray GA, et al. Thyroid hormones and changes in body weight and metabolic parameters in response to weight loss diets: the POUNDS LOST trial. Int J Obes (Lond). 2017;41(6):878-886. doi:10.1038/ijo.2017.28
- Bahn R, Burch H, Cooper D, et al. Hyperthyroidism and other causes of thyrotoxicosis: Management guidelines of the American Thyroid Association and American Association of Clinical Endocrinologists. Endocrine Practice. 2011;17(3). doi:10.1089/thy.2010.0417
- Braverman L, Cooper D. Werner & Ingbar's The Thyroid, 10th Edition. WLL/Wolters Kluwer; 2012.
- Garber J, Cobin R, Gharib H, et. al. Clinical practice guidelines for hypothyroidism in adults: Cosponsored by the American Association of Clinical Endocrinologists and the American Thyroid Association. Endocrine Practice. 2012;18(6). doi:10.1089/thy.2012.0205
- Haugen A, Alexander K., Bible K, et. al. 2015 American Thyroid Association Management guidelines for adult patients with thyroid nodules and differentiated thyroid cancer. Thyroid. 2016;26(1):1-133. doi:10.1089/thy.2015.0020
- Smallridge R, Ain K, Asa S, et. al. American Thyroid Association guidelines for management of patients with anaplastic thyroid cancer. Thyroid. 2012;22(11). doi:10.1089/thy.2012.0302
- Wells, S, Asa S, Dralle H, et. al. Revised American Thyroid Association guidelines for the management of medullary thyroid carcinoma. Thyroid. 2015;25(6). doi:10.1089/thy.2014.0335
Jerry Rankin began his writing career in 1992. His latest book will be published in the fall of 2010 by Luminos Publishing. He is a doctor of Oriental medicine and graduated from the Florida College of Integrative Medicine with a master of science in Oriental medicine. He also has bachelor's degrees in psychology and health studies.