Take Synthroid exactly as it was prescribed for you. Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose.
Synthroid works best if you take it on an empty stomach, 30 to 60 minutes before breakfast. Follow your doctor's dosing instructions and try to take the medicine at the same time each day.
Synthroid can be given to infants and children who cannot swallow whole tablets by crushing the tablet and mixing the freshly crushed tablet in a small amount (5 to 10 mL or 1 to 2 teaspoonfuls) of water and immediately giving the misture by spoon or dropper. Do not store the crushed tablet/water mixture and do not administer it mixed with foods that decrease absorption of levothyroxine, such as soybean-based infant formula.
Levothyroxine doses are based on weight in children. Your child's dose needs may change if the child gains or loses weight.
It may take several weeks before your body starts to respond to Synthroid. Keep using this medicine even if you feel well. You may need to take Synthroid for the rest of your life.
You may need frequent medical tests. Tell any doctor, dentist, or surgeon who treats you that you are using Synthroid.
Store at room temperature away from moisture and heat.
Do not share this medicine with another person, even if they have the same symptoms you have.
 Detailed Synthroid dosage information
What happens if I miss a dose?
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include headache, leg cramps, tremors, feeling nervous or irritable, chest pain, shortness of breath, and fast or pounding heartbeats.
