Medication Guide App

Synthroid (levothyroxine) and Alcohol / Food Interactions

There are 3 alcohol/food/lifestyle interactions with Synthroid (levothyroxine) which include:

levothyroxine ↔ multivitamins with minerals

Moderate Drug Interaction

Using multivitamin with minerals together with levothyroxine may decrease the effects of levothyroxine. You should separate the administration of levothyroxine and multivitamin with minerals by at least 4 hours. If your doctor does prescribe these medications together, you may need a dose adjustment or special test to safely use both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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levothyroxine ↔ food

Moderate Food Interaction

The timing of meals relative to your levothyroxine dose can affect absorption of the drug. Therefore, levothyroxine should be taken on a consistent schedule with regard to time of day and relation to meals so as to maintain steady blood levels. In addition, absorption of levothyroxine may be decreased by foods such as soybean flour, cotton seed meal, walnuts, dietary fiber, calcium, and calcium fortified juices. These foods should be avoided within several hours of dosing if possible.

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High Blood Pressure (Hypertension)

Severe Potential Hazard, High plausibility

thyroid hormones - cardiovascular disease

Thyroid hormones cause increases in myocardial contractility and heart rate as a result of increased metabolic demands and oxygen consumption. Therapy with thyroid hormones should be administered cautiously and initiated at reduced dosages in patients with cardiovascular disorders such as angina, coronary artery disease, and hypertension. Clinical monitoring of cardiovascular function is recommended. If chest pain or exacerbation of cardiovascular disease occurs, the dosage of thyroid hormone should be reduced, even at the expense of achieving euthyroid state. Thyroid hormones should not be administered to patients with an acute myocardial infarction that is not complicated by hypothyroidism.

References

  1. "Product Information. Synthroid (levothyroxine)." Abbott Pharmaceutical, Abbott Park, IL.
  2. "Product Information. Thyrolar (liotrix)." Forest Pharmaceuticals, St. Louis, MO.
  3. "Product Information. Armour thyroid (thyroid desiccated)." Forest Pharmaceuticals, St. Louis, MO.
View all 4 references

You should also know about...

Synthroid (levothyroxine) drug Interactions

There are 559 drug interactions with Synthroid (levothyroxine)

Synthroid (levothyroxine) disease Interactions

There are 5 disease interactions with Synthroid (levothyroxine) which include:

Drug Interaction Classification

The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.

Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.

Do not stop taking any medications without consulting your healthcare provider.

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