Levothyroxine (Synthroid) Drug Uses, Doeses, Side Effects & Information | LowestMed

Levothyroxine, Generic for Synthroid

Levothyroxine is a thyroid medication that works by replacing a thyroid produced hormone that regulates your body’s energy and metabolism.

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Levothyroxine is used for:

Levothyroxine is used to treat hypothyroidism (low thyroid hormone) and can also be used to treat or prevent goiter (enlarged thyroid gland). Levothyroxine replaces a hormone that is normally produced by your thyroid gland.

How to use Levothyroxine:

Before using Levothyroxine, be sure to consult your doctor and consider the risks of taking the medication. This is a decision you and your doctor will make.

Consider the following before using Levothyroxine:


Tell your doctor if you ever had any unusual or allergic reaction to Levothyroxine or any other medications. You should also make your physician aware of any other types of allergies, such as foods, allergies to dyes, preservatives, or animals.


There is no evidence that suggests there are pediatric-specific problems that would limit the usefulness of Levothyroxine in children.


There is no evidence that suggests there are geriatric-specific problems that would limit the usefulness of Levothyroxine in the elderly. However, older patients are more likely to have age-related heart or blood vessel problems.

Pregnancy and Breast Feeding

From studies, there is no increased risk of fetal abnormalities for pregnant woman who take Levothyroxine. Using Levothyroxine while breastfeeding poses minimal risk to the infant.

Other Medical Issues

The presence of certain medical problems may affect the use of Levothyroxine. Consult your doctor before taking Levothyroxine if you have any of the following conditions:

  • Thyrotoxicosis (increased thyroid hormones)
  • Decreased adrenal gland function
  • Heart Disease (coronary disease, irregular heartbeat)
  • High blood pressure
  • Diabetes

Instructions for use:

Use Levothyroxine as directed by your doctor. Check the label on the medication for exact dosing instructions

  • Levothyroxine is taken by mouth on an empty stomach, 30-60 minutes before breakfast.
  • Do not take antacids or products with iron or calcium in them within 4 hours of taking Levothyroxine.
  • If you have trouble swallowing tablets or if the patient is a child, you may crush the correct dose of this medication. Add the crushed medicine to 1 to 2 teaspoons of water and mix well. Use a spoon or dropper to administer the medication as soon as possible. Do not store this mixture for later use. Do not mix crushed tablets in soybean infant formula.
  • Do not miss any doses. Be sure to continue taking Levothyroxine, even if you feel well.
  • If you miss a dose of Levothyroxine, take it as soon as possible. Do not take 2 doses at once. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule.
  • Store the medication in a closed container at room temperature, away from heat, moisture, and direct light.
  • Talk to your doctor or pharmacist if you have any questions about how to use Levothyroxine.

Levothyroxine Side Effects:

Side effects can exist in all medications, but many people have no, or minor, side effects. If any of these common side effects persist or become worrisome, be sure to discuss them with your doctor.

Common Levothyroxine Side Effects

  • Headache
  • Leg cramps
  • Feeling nervous or irritable
  • Diarrhea
  • Skin rash
  • Mild hair loss
Major Side Effects

Contact your doctor immediately if you experience any of these side effects when taking Levothyroxine.


  • Fast or irregular heart rate
  • Chest pain
  • Shortness of breath
  • Memory problems
  • Loss of consciousness
  • Swelling of the eyes, face, lips, throat, or tongue
  • Seizures

Levothyroxine Prices:

Prices are for prescriptions of 30 tablets of 50 mcg:

Levothyroxine: $4.00

Synthroid: $38.69

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Rosuvastatin Drug Images:

Levothyroxine .1 MG Tablet
Levothyroxine .1 MG Tablet
Levothyroxine .075 MG Tablet
Levothyroxine .075 MG Tablet
Levothyroxine .137 MG Tablet
Levothyroxine .137 MG Tablet
Levothyroxine .175 MG Tablet
Levothyroxine .175 MG Tablet

Levothyroxine Alternatives:

Thyroid Hormone (generic for Armour Thyroid)

Liothyronine (generic for Cytomel)

Levothyroxine Patent Information:

Generic drugs don’t require patents, only brand name drugs do. Synthroid product exclusivity ended in 2004.

Levothyroxine Warnings:

Before taking Levothyroxine, discuss any allergies you may have with your doctor. This product may contain inactive ingredients, which could possibly cause allergic reactions or other problems.

Discuss your medication history with your doctor or pharmacist, before taking Levothyroxine. Inform them especially of: increased thyroid hormones (thyrotoxicosis), decreased adrenal gland function, heart disease, high blood pressure, diabetes.

Current studies have shown that Levothyroxine is safe for pregnancy. Tell your doctor if you are pregnant because your dose may need to be adjusted.

Levothyroxine passes into breast milk, but is unlikely to harm an infant. Consult your doctor before breast-feeding.

If Overdose of Levothyroxine is Suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center, or emergency room immediately.

Proper storage of Levothyroxine:

Levothyroxine should be stored at room temperature, between 68 and 77 degrees F (20 to 25 degrees C). Store away from heat, moisture, and light. Do not store in the bathroom. Keep Levothyroxine out of the reach of children and away from pets.

The information provided by LowestMed is meant for educational purposes only and is not meant to be medical advice. Please seek medical advice before starting, changing or terminating any medical treatment. Discuss all medical related decisions with your physician, before adjusting anything related to your health care.