The most common side effect of Armour Thyroid is hair loss, which generally goes away after several months of treatment, according to RxList. More serious side effects include allergic reactions, heat sensitivity, increased sweating, mental changes and diarrhea.
Other serious side effects of Armour Thyroid include shaking, shortness of breath, headache, seizures and tiredness, as indicated by RxList. A fast, irregular or pounding heartbeat may occur as well as swelling of the hands, feet or ankles. Mental changes may include mood swings and nervousness. Signs of an allergic reaction to the medication include rash, itching, severe dizziness, trouble breathing and swelling of the throat or facial area. Patients should contact their doctor immediately if they experience any of these side effects because some require emergency medical treatment.
Many of the side effects of Armour Thyroid occur due to high thyroid hormone levels in the body, according to WebMD. Although hair loss is generally temporary when starting the medication, patients should contact a doctor or pharmacist if the side effect worsens or persists. Many patients experience no side effects when taking Armour Thyroid, and a serious allergic reaction is rare. Since Armour Thyroid may interact with blood thinners, birth control pills, diabetes medications and hormone replacement therapy, patients should consult a doctor before taking Armour Thyroid with these or other medications, as confirmed by RxList.