Synthroid, Euthyrox, Levoxyl, Unithroid, Levo-T, Tirosint, Tirosint-Sol (liquid), Ermeza (liquid), Thyquidity (liquid)
Levothyroxine sodium
Treats hypothyroidism and certain types of thyroid cancer.
Hormone, thyroid agent, endocrine-metabolic agent
Tablet, capsule, oral solution (liquid), injection
By mouth
Levothyroxine is a synthetic thyroid hormone used to treat an underactive thyroid gland (hypothyroidism). Doctors also use it for certain types of thyroid cancer.
Tablets
25 micrograms (mcg)
50 mcg
75 mcg
88 mcg
100 mcg
112 mcg
125 mcg
137 mcg
150 mcg
175 mcg
200 mcg
300 mcg
Capsules
13 mcg
25 mcg
50 mcg
75 mcg
88 mcg
100 mcg
112 mcg
125 mcg
137 mcg
150 mcg
175 mcg
200 mcg
Oral solution (liquid)
13 mcg/mL (single-dose vial)
20 mcg/mL (bottle)
25 mcg/mL (single-dose vial)
30 mcg/mL (bottle)
37.5 mcg/mL (single-dose vial)
44 mcg/mL (single-dose vial)
50 mcg/mL (single-dose vial)
62.5 mcg/mL (single-dose vial)
75 mcg/mL (single-dose vial)
88 mcg/mL (single-dose vial)
100 mcg/mL (single-dose vial)
112 mcg/mL (single-dose vial)
125 mcg/mL (single-dose vial)
137 mcg/mL (single-dose vial)
150 mcg/mL (single-dose vial)
175 mcg/mL (single-dose vial)
200 mcg/mL (single-dose vial)
Injection
100 mcg/vial
For underactive thyroid in adults: 50–200 mcg taken once per day
For underactive thyroid in children: dosages vary by age, taken once per day
For thyroid-dependent well-differentiated thyroid cancer: doses are individualized
For severe hypothyroidism (myxedema coma): doses are given as intravenous injections by a healthcare professional
Find more detailed information about levothyroxine (Synthroid) dosage, strengths, and forms here.
Levothyroxine Sodium
30 capsules, 100 mcg box
Levothyroxine Sodium
30 capsules, 112 mcg box
Levothyroxine Sodium
30 capsules, 125 mcg box
Levothyroxine Sodium
30 capsules, 13 mcg box
Levothyroxine Sodium
30 capsules, 137 mcg box
Levothyroxine Sodium
30 capsules, 150 mcg box
Levothyroxine Sodium
30 capsules, 175 mcg box
Levothyroxine Sodium
30 capsules, 200 mcg box
Levothyroxine Sodium
30 capsules, 25 mcg box
Levothyroxine Sodium
30 capsules, 50 mcg box
Levothyroxine Sodium
30 capsules, 75 mcg box
Levothyroxine Sodium
30 capsules, 88 mcg box
Levothyroxine Sodium
100 mcg single-dose vial
Levothyroxine Sodium
500 mcg single-dose vial
Levothyroxine Sodium
100mcg solution reconstituted
Levothyroxine Sodium
200mcg solution reconstituted
Levothyroxine Sodium
500mcg solution reconstituted
Levothyroxine Sodium
100mcg tablet
Levothyroxine Sodium
112mcg tablet
Levothyroxine Sodium
125mcg tablet
Levothyroxine Sodium
137mcg tablet
Levothyroxine Sodium
150mcg tablet
Levothyroxine Sodium
175mcg tablet
Levothyroxine Sodium
200mcg tablet
Levothyroxine Sodium
25mcg tablet
Levothyroxine Sodium
300mcg tablet
Levothyroxine Sodium
50mcg tablet
Levothyroxine Sodium
75mcg tablet
Levothyroxine Sodium
88mcg tablet
Levothyroxine Sodium
1ml of 100mcg/ml vial
Levothyroxine Sodium
5ml of 100mcg/5ml vial
Levothyroxine Sodium
5ml of 200mcg/5ml vial
Levothyroxine Sodium
5ml of 500mcg/5ml vial
Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.
Read and follow the patient instructions that come with this medicine. Talk to a doctor or pharmacist if you have any questions.
You may have to take this medicine for 4 to 8 weeks before your symptoms start to get better.
Take this medicine in the morning on an empty stomach, at least 30 to 60 minutes before eating breakfast.
If you take calcium supplements, calcium carbonate, iron supplements, or antacids, take levothyroxine at least four hours before or four hours after you take one of these supplements or antacids.
How to take levothyroxine tablets
Swallow the levothyroxine tablet whole.
If you are giving this medicine to a baby or child who cannot swallow the tablet whole, crush the tablet and mix it with 1 to 2 teaspoons of water and give the mixture to the child.
Levothyroxine tablets normally need to be stored at room temperature and protected from light, heat, and moisture.
How to take levothyroxine capsules
Swallow the levothyroxine capsule whole. Do not cut, crush, or chew the capsules.
Store levothyroxine capsules at room temperature protected from light, moisture, and heat.
How to take levothyroxine oral solution
This medicine will either come in a bottle or single-dose vials (Tirosint-Sol)
Neither the bottle nor the vials need to be shaken before use.
For levothyroxine oral solution vials, use one vial per day.
The contents of the vial can be poured directly into the mouth, poured into a spoon, or mixed with a cup of water.
For levothyroxine oral solution bottles, measure each dose with the calibrated syringe that comes with the medicine. It’s very important to measure these doses precisely.
Store levothyroxine oral solution at room temperature.
Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose.
Do not take extra medicine to make up for a missed dose.
This medicine is not right for everyone.
Do not use it if you have an underactive adrenal gland (adrenal insufficiency) that hasn’t been corrected.
People who are allergic to any of the ingredients in the pills or oral solution (such as glycerol) should not take levothyroxine products with those ingredients. Switch to another version of levothyroxine.
Tell any doctor or other healthcare provider who treats you that you are using this medicine.
Your doctor may need to do lab tests regularly to check on the effects of this medicine and make sure the dose is correct. Keep all appointments.
Tell your doctor if you are pregnant or breastfeeding.
Tell your doctor if you have:
Heart problems
Thyroid nodules
Kidney disease
Pituitary gland problems
Adrenal gland problems
Diabetes
Low red blood cell counts
A history of blood clotting problems
Food or drug allergies
Tell your doctor if you have recently received radiation treatment with iodine.
This medicine may cause the following problems:
Heart problems, including angina (chest pain)
Heart rhythm abnormalities
Worsening of diabetes
Bone weakening and loss of bone density
This medicine should never be used to treat obesity or as part of a treatment plan for a weight control program. It should never be used to enhance athletic performance.
Do not stop taking levothyroxine except under the advice of your doctor.
To avoid potentially hazardous drug interactions, tell the prescribing healthcare provider about all prescription drugs, over-the-counter medications, and supplements you use before taking amitriptyline.
Tell other healthcare providers you are using this medicine before they prescribe new medications.
Some medicines can affect how levothyroxine works or increase the risk or severity of side effects. Alternatively, levothyroxine can affect how other medicines work. Tell your doctor if you are taking:
Birth control pills
Diabetes medications or insulin
Drugs that treat depression
NSAIDs such as aspirin or ibuprofen
Aspirin and drugs like aspirin called salicylates
Steroids like testosterone or prednisone
Blood pressure medications called beta blockers
Cholesterol treatments called fibrates
Blood thinners
The anticancer drugs mitotane, tamoxifen, asparaginase, or tyrosine-kinase inhibitors
The heart rhythm drugs amiodarone or digoxin
The anti-seizure drugs carbamazepine, phenytoin, or phenobarbital
The diuretic furosemide
Extended-release niacin
Ketamine
Heroin or methadone
Some drugs, foods, or supplements can affect how well the body absorbs your levothyroxine dose. These foods, supplements, and drugs can be taken with levothyroxine as long as they’re taken 4 hours before or 4 hours after the day’s levothyroxine dose:
Soy products or soybean flour
High-fiber foods
Dietary supplements containing iron, calcium, or magnesium
Antacids
Heartburn or ulcer drugs called proton pump inhibitors
The ulcer drug sucralfate
High cholesterol drugs called bile acid sequestrants
The stomach gas drug simethicone
The obesity treatment orlistat
Treatments for high electrolyte levels including kayexalate, sevelamer, or lanthanum
Do not eat grapefruit or drink grapefruit juice while you are using this medicine.
Serious side effects
Talk to a doctor if you notice any signs or symptoms of a possible serious side effect including:
Fast, pounding, or uneven heartbeat
Chest pain
Chest pain that may spread, trouble breathing, unusual sweating, fainting
Confusion, swelling of the face, tongue, or lower legs, feeling cold, unusual tiredness or weakness
Seizures
Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Some serious side effects have only been reported in children. If you are giving a child levothyroxine, see a doctor if the child experiences symptoms such as:
Walking with a limp, hip pain
Severe headache, pain behind the eyes, blurred or double vision, nausea, vomiting
Less serious side effects
Heart palpitations
Increased appetite
Fast pulse
Nervousness
Tremor
Weight loss
Sweating
Diarrhea
Trouble sleeping
Nervousness
Sensitivity to heat
Find more detailed information about levothyroxine (Synthroid) side effects here.
Ermeza levothyroxine sodium solution prescribing information, DailyMed (NIH National Library of Medicine)
Levothyroxine sodium capsule prescribing information, DailyMed (NIH National Library of Medicine)
Levothyroxine sodium injection prescribing information, DailyMed (NIH National Library of Medicine)
Levothyroxine sodium tablet prescribing information, DailyMed (NIH National Library of Medicine)
Thyquidity levothyroxine sodium solution prescribing information, DailyMed (NIH National Library of Medicine)
Tirosant-Sol levothyroxine sodium solution prescribing information, DailyMed (NIH National Library of Medicine)
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