Detailed dosage guidelines and administration information for Synthroid (levothyroxine sodium). Includes dose adjustments, warnings and precautions. Detailed Levothyroxine dosage information for adults, the elderly and children. Includes dosages for Hypothyroidism, TSH Suppression and Myxedema Coma; plus renal, liver and dialysis adjustments. Determines a weight-based levothyroxine dose for treatment of primary hypothyroidism. Enter the patient’s body weight (kg or lbs) to calculate the full oral thyroid replacement dose of levothyroxine for the treatment of hypothyroidism. Please fill out required fields. Synthroid comes in 12 dosing options to help your doctor find the dose that's right for you. Your doctor will determine your starting dose based on your weight, age, cause of hypothyroidism, and other health conditions, as well as other medications you’re taking. Medscape - Hypothyroidism-specific dosing for Synthroid, Levoxyl (levothyroxine), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation. Learn about Synthroid (levothyroxine) dosage, including starting doses, dosage charts for adults and children, adjustments, and how to take it safely. View SYNTHROID® 12 precise dosing options. Find SYNTHROID® dose calculations, adjustments, guidelines, and food & drug interactions here. Learn how levothyroxine doses are calculated, what tablet strengths are available, and how dosing changes with age, pregnancy, and time. Are you on Levothyroxine but still experiencing symptoms of Hypothyroidism? Use this dosage guide to help you find how much you should be taking. This article explains exactly how levothyroxine starting doses are determined, why they differ for different patient populations, and what the dose-finding process looks like in practice.