Before Using

Drug information provided by: Micromedex

In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:

Allergies

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.

Pediatric

Appropriate studies performed to date have not demonstrated pediatrics-specific problems that would limit the usefulness of levothyroxine in children .

Geriatric

Appropriate studies performed to date have not demonstrated geriatrics-specific problems that would limit the usefulness of levothyroxine in the elderly. However, elderly patients are more likely to have age-related heart and blood vessel problems, which may require caution in patients receiving levothyroxine .

Pregnancy

Information about this levothyroxine-injection-route
Pregnancy Category Explanation
All Trimesters A Adequate studies in pregnant women have not shown an increased risk of fetal abnormalities.

Breastfeeding

Studies in women suggest that this medication poses minimal risk to the infant when used during breastfeeding.

Drug Interactions

Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

  • Amifampridine

Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Amineptine
  • Amitriptyline
  • Amitriptylinoxide
  • Amoxapine
  • Clomipramine
  • Desipramine
  • Dibenzepin
  • Doxepin
  • Imipramine
  • Ketamine
  • Lofepramine
  • Maprotiline
  • Melitracen
  • Mirtazapine
  • Nortriptyline
  • Opipramol
  • Protriptyline
  • Tianeptine
  • Trimipramine

Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.

  • Acenocoumarol
  • Anisindione
  • Cholestyramine
  • Chromium
  • Colesevelam
  • Conjugated Estrogens
  • Dicumarol
  • Eltrombopag
  • Esterified Estrogens
  • Estradiol
  • Estriol
  • Estrone
  • Estropipate
  • Fosphenytoin
  • Imatinib
  • Kelp
  • Lanthanum Carbonate
  • Lopinavir
  • Phenindione
  • Phenprocoumon
  • Phenytoin
  • Rifampin
  • Rifapentine
  • Ritonavir
  • Sevelamer
  • Simvastatin
  • Sodium Polystyrene Sulfonate
  • Soybean
  • Warfarin

Other Interactions

Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

Other Medical Problems

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Adrenal insufficiency or Addison's disease (untreated) or
  • Heart attack or
  • Thyrotoxicosis (overactive thyroid)—This medicine should NOT be used in patients with any of these conditions .
  • Clotting disorder or
  • Diabetes or
  • Heart disease (history of) or
  • Other adrenal gland problems or
  • Underactive pituitary gland—Use with caution. Dosage adjustment may be needed .