It contains thyroxine as the active ingredient. Thyroxine is a hormone which is produced naturally in the body by the thyroid gland. Levothyroxine is a synthetic version of this hormone. Thyroxine controls how much energy your body uses. When the thyroid gland does not produce enough thyroxine (a condition known as hypothyroidism), many of the body’s functions slow down. Some of the most common symptoms of hypothyroidism are: tiredness weight gain feeling depressed Thyronorm tablets are used to replace the thyroxine that your thyroid gland cannot produce and prevent the symptoms of hypothyroidism. Before starting your treatment your doctor will carry out a blood test to work out how much levothyroxine you need. Indication: Hypothyroidism, TSH suppression, Myxoedema coma Direction to Use Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. You should usually take your tablets before breakfast or your first meal of the day. Side Effects Nervousness, excitability, tremor, muscle weakness, fatigue, cramps, sweating, flushing, heat intolerance, headache, fever, insomnia, tachycardia, palpitations, depression, HTN, vomiting, menstrual irregularities, diarrhea, vomiting, psychosis or agitation, difficulty in sleeping. SUBSTITUTES