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Levothyroxine

Most Commonly Used
Levothyroxine 175mcg Tab
Mylan Pharmaceuticals Inc
Pill Identification: M  |  L 12
Drug Image file DrugItem_4000.JPG
Levothyroxine 125mcg Tab
Mylan Pharmaceuticals Inc
Pill Identification: M  |  L 10
Drug Image file DrugItem_3998.JPG
Levothyroxine 137mcg Tab
Mylan Pharmaceuticals Inc
Pill Identification: L 15  |  M
Drug Image file DrugItem_8687.JPG
Levothyroxine 200mcg Tab
Mylan Pharmaceuticals Inc
Pill Identification: M  |  L 13
Drug Image file DrugItem_4002.JPG
Levothyroxine 75mcg Tab
Mylan Pharmaceuticals Inc
Pill Identification: M  |  L 6
Drug Image file DrugItem_3994.JPG
Also See:
  • Answers to Frequently-Asked Questions (FAQs)
  • Other Class Related Drugs
  • Additional Patient Usage Statistics


Common Side Effects of Levothyroxine Sodium
Levothyroxine replaces a hormone the body makes on its own. Most people can take it safely. However, your doctor will want to know if you have any other medical condition, so he or she can make sure levothyroxine is the right medicine for you. These include:
  • Diabetes
  • Heart disease, heart attack, or chest pain
  • Kidney disease
  • Liver disease
  • Osteoporosis
  • Clotting problems
  • Adrenal or pituitary gland problems
  • A thyroid condition called thyrotoxicosis
Tell your doctor if you are pregnant or breast-feeding. If you become pregnant while taking levothyroxine, notify your doctor. Levothyroxine is generally considered safe during pregnancy and is not known to harm a nursing baby, but your doctor may need to adjust your levothyroxine dose.

If you have diabetes, talk to your doctor about how levothyroxine might affect your blood sugar levels. Your doctor may want to make adjustments to your diabetes medicines and ask that you monitor your blood sugar levels closely.

Levothyroxine can sometimes cause interactions with other medicines. These include over-the-counter medicines, such as antacids. Tell your doctor about any medicine you take, including over-the-counter medicines, herbal supplements, vitamins, and other supplements. Your doctor will want to know about any medicine that you take.

Levothyroxine can some side effects. If any side effect of levothyroxine is severe, is worrying you, or does not go away, let your doctor know right away. Some side effects when taking levothyroxine include:
  • Fatigue
  • Changes in appetite, weight loss, or weight gain
  • Tremor or shakiness
  • Headache
  • Nausea or vomiting
  • Diarrhea, vomiting, or stomach cramps
  • Nervousness or irritability
  • Trouble sleeping
  • Excessive sweating
  • Fever
  • Changes in menstrual cycle
  • Sensitivity to heat
  • Temporary hair loss
This is not a complete list of side effects of levothyroxine. Talk with your doctor about these or any side effects you notice while taking levothyroxine.

More serious symptoms may require immediate care. Get help right away for more serious signs such as:
  • Chest pain (angina)
  • Fast or irregular heartbeat
  • Signs of an allergic reaction: hives; trouble breathing; or swelling of the face, neck, mouth, or tongue