Be sure to discuss possible side effects of this or any other treatment with your doctor before taking the medicine. Side effects might include insomnia, tremors, headache, nausea, cramping, increased appetite, heat sensitivity and more. 

Some foods or minerals may affect the way the medicine works. For example, if you take antacids, your doctor may recommend you take them or other medication at least four hours before or after you take this medication. Other medications or substances that might interfere with levothyroxine may include soy products, iron supplements, cholestramine, sodium polystrene sulfonate and more. 

Hypothyroidism is a manageable condition – it's simply a matter of being diagnosed properly and monitoring the condition and your health. Most people who are diagnosed and treated for hypothyroidism lead healthy, normal lives.