Learn about Synthroid (levothyroxine) dosage, including starting doses, dosage charts for adults and children, adjustments, and how to take it safely. Levothyroxine is used to treat an underactive thyroid (hypothyroidism). It replaces or provides more thyroid hormone, which is normally produced by the thyroid gland. Low thyroid hormone levels can occur naturally or when the thyroid gland is injured by radiation/medications or removed by surgery. Having enough thyroid hormone is important for maintaining normal mental and physical activity. Pill Imprint SYNTHROID 50 This white round pill with imprint SYNTHROID 50 on it has been identified as: Synthroid 50 mcg (0.05 mg). Find drug information for Synthroid on CVS.com, including related drug classes, side effects, dosage, and answers to frequently asked questions. Synthroid (levothyroxine) treats hypothyroidism (low thyroid hormone) and different types of goiters (enlarged thyroid gland). Includes Synthroid side effects, interactions and indications. Synthroid (levothyroxine) is a brand-name prescription drug that’s used to treat hypothyroidism and suppress TSH. Learn about side effects, dosage, and more. Levothyroxine (Generic for Levoxyl, Synthroid, Unithroid) Tablet · 50mcg · 30 days supply Average insurance price $200 To get your exact price, transfer your prescription. Synthroid is a prescription medicine used to treat the symptoms of hypothyroidism and an enlarged thyroid gland (goiter). Learn about dosage, side effects, drug interactions, warnings, and more. The pill with imprint SYNTHROID 50 (White, Round, 7 mm) has been identified as Synthroid 50 mcg (0.05 mg). It is used for Hashimoto's disease, Underactive Thyroid, Hypothyroidism, After Thyroid Removal, TSH Suppression, and Myxedema Coma. SYNTHROID® (levothyroxine sodium) tablets, for oral use is a prescription, man-made thyroid hormone that is used to treat a condition called hypothyroidism in adults and children, including infants.