Mar 11, 2024 · Learn about the side effects of Synthroid (levothyroxine), from common to rare, for consumers and healthcare professionals.

Common side effects of Synthroid include chest pain, increased heart rate or pulse rate, excessive sweating, heat intolerance, nervousness, headache, insomnia, diarrhea, vomiting, …

Oct 29, 2025 · More common side effects of Synthroid include irregular heartbeat, shortness of breath, headache, muscle weakness or spasms, and increased appetite, which may lead to …

Oct 1, 2025 · Using this medicine with any of the following may cause an increased risk of certain side effects but may be unavoidable in some cases. If used together, your doctor may change …

Feb 16, 2024 · As with other drugs, Synthroid can cause side effects, such as hair loss, heart problems, and weight loss. Read on to learn about potential common, mild, and serious side …

Mar 5, 2024 · Common side effects of Synthroid include: and temporary hair loss. Notify your doctor if you experience serious side effects of Synthroid including rapid heartbeat, fluttering in …

Taking too much or too little SYNTHROID may lead to negative effects on growth and development, heart function, bone health, reproductive function, mental health, digestive …

May 1, 2024 · Common levothyroxine side effects include heat intolerance, a fast heart rate, and diarrhea. Weight loss and hair changes are also possible. More serious levothyroxine side …

Levothyroxine may cause serious or life-threatening problems when given in large doses, especially when taken with amphetamines such as amphetamine (Adzenys, Dyanavel XR, …

What are the side effects of levothyroxine? Some common side effects of levothyroxine include fast heart rate, insomnia, fatigue, hair loss, and weight loss. Side effects can happen in the …