Hi 👋 I have been taking this medication for over two years now. I had to see an endocrinologist in order to get my levels straightened out. There are a few side effects, including weight loss and weight gain. Here's a list of other side effects from Google: headache vomiting diarrhea changes in appetite fever changes in menstrual cycle sensitivity to heat hair loss joint pain leg cramps Best of luck to you on your journey with hypothyroidism. I was diagnosed with it when I was 7 years old, along with panhypopituitarism caused by a tumor on my pituitary gland, which was only partially removed.