Uses & Effectiveness? Likely Effective for. Sleep disorders in blind people. Taking melatonin by mouth helps improve sleep disorders in blind children and adults. Read all of this leaflet carefully before you start taking this medicine. Keep this leaflet. You may need to read it again. If you have any further questions, ask your doctor or pharmacist. Learn about Levothroid (Levothyroxine Sodium) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Levothyroxine - What are the effects if you stop taking your thyroid medicine for 2-3 weeks? Asked 3 Nov 2014 by Bluerosemoon Updated 16 December 2018 There is one purpose for taking thyroid hormone: to replace the thyroid hormone levels when your thyroid is underactive (hypothyroidism). L-thyroxine (also called LT4 or levothyroxine) Thyroid cancer is a rare type of cancer that affects the thyroid gland, a small gland at the base of the neck. The most common symptom of cancer of the thyroid is a painless lump or swelling that develops in the neck. THYROXINE (T4) REPLACEMENT. Hypothyroidism can’t be cured. But in almost every patient, hypothyroidism can be completely controlled. It is treated by replacing the amount of hormone that your own thyroid can no longer make, to bring your T4 and TSH levels back to normal levels. Click here for Frequently Asked Questions on Optimal Thyroid Replacement. The majority of patients with hypothyroidism are treated with thyroxine, also known as T4 (Trade names include Synthroid, Eltroxin, Levoxyl etc). Many of the signs of hyperthyroidism caused by taking too much levothyroxine can be found in the skin. Too much levothyroxine can make the skin unusually warm, due to increased blood flow. Thyroxine is an important hormone in the body - but how much is too much and how much is too little? Find out the effects of having too much or too little Thyroxine in the body.