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Can you take Botox with Levothyroxine?

No drug interactions found, but 15 warnings to review for the following 2 drugs:

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Drug interactions

There were no interactions found between Botox and levothyroxine. However, this does not necessarily mean no interactions exist. Always consult your healthcare provider.

Food/lifestyle interactions

Moderate food/lifestyle interactions

Moderate:

levothyroxine Food/Lifestyle

Applies to: levothyroxine

The timing of meals relative to your oral levothyroxine dose can affect the absorption of the medication.

Therefore, levothyroxine should be taken on a consistent schedule with regard to time of day and relation to meals to avoid large fluctuations in blood levels, which may alter its effects.

In addition, absorption of levothyroxine may be decreased and/or delayed by foods such as:

  • soybean flour
  • cotton seed meal
  • walnuts
  • dietary fiber
  • calcium
  • calcium fortified juices
  • grapefruit or grapefruit juice

These foods should be avoided within several hours of dosing if possible.

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.

Moderate:

levothyroxine multivitamins with minerals

Applies to: levothyroxine

Using multivitamins with minerals together with levothyroxine may decrease the effects of levothyroxine.

You should separate the administration of levothyroxine and multivitamins 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.

Disease interactions

13 potential interactions Applies to: 13 conditions, including High Blood Pressure, Urinary Tract Infection, Seizures, Hyperthyroidism, and Myasthenia Gravis.

Adrenal Insufficiency

Major:

levothyroxine

Levothyroxine has a major potential interaction with Adrenal Insufficiency.

The use of thyroid hormones is contraindicated in patients with uncorrected adrenal insufficiency. Thyroid hormones increase tissue demand for adrenocortical hormones and may precipitate acute adrenal crisis. In patients with controlled adrenal insufficiency or other endocrine disorders, therapy for these concomitant disorders may need to be adjusted following thyroid replacement, since hypothyroidism often obscure or diminish the signs and symptoms of these conditions. Clinical monitoring of thyroid and adrenal function as well as any other appropriate endocrine function is recommended during thyroid hormone therapy.

Diabetes Insipidus

Moderate:

levothyroxine

Levothyroxine has a moderate potential interaction with Diabetes Insipidus.

Since hypothyroidism often obscure or diminish the signs and symptoms of endocrine disorders such as diabetes mellitus or diabetes insipidus, thyroid replacement therapy may aggravate the intensity of symptoms associated with these conditions. Patients with endocrine disorders should be monitored more closely during thyroid hormone therapy, and their medication regimen adjusted accordingly. If thyroid medication is later discontinued, a downward readjustment of insulin or oral hypoglycemic agent may be necessary in patients with diabetes mellitus to avoid hypoglycemia.

Diabetes Mellitus

Moderate:

levothyroxine

Levothyroxine has a moderate potential interaction with Diabetes Mellitus.

Since hypothyroidism often obscure or diminish the signs and symptoms of endocrine disorders such as diabetes mellitus or diabetes insipidus, thyroid replacement therapy may aggravate the intensity of symptoms associated with these conditions. Patients with endocrine disorders should be monitored more closely during thyroid hormone therapy, and their medication regimen adjusted accordingly. If thyroid medication is later discontinued, a downward readjustment of insulin or oral hypoglycemic agent may be necessary in patients with diabetes mellitus to avoid hypoglycemia.

Dysphagia

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Dysphagia.

Treatment with botulinum toxin products, including abobotulinumtoxinA, incobotulinumtoxinA, onabotulinumtoxinA, daxibotulinumtoxinA, letibotulinumtoxinA and others can result in swallowing and breathing difficulties and in general increased neuromuscular compromise. Deaths due to severe dysphagia or respiratory failure have been reported after treatment with botulinum toxin. Care should be exercised with using these products in patients with pre- existing swallowing or respiratory disorders or peripheral motor neuropathic diseases or neuromuscular disorders (e.g., myasthenia gravis, amyotrophic lateral sclerosis), as they may be at increased risk of clinically significant effects including generalized muscle weakness, diplopia, ptosis, dysphonia, dysarthria, severe dysphagia and respiratory compromise. Patients treated with botulinum toxin may require immediate medical attention should they develop these complications. Caution is advised.

Heart Disease

Major:

levothyroxine

Levothyroxine has a major potential interaction with Heart 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.

High Blood Pressure

Major:

levothyroxine

Levothyroxine has a major potential interaction with High Blood Pressure.

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.

Hyperthyroidism

Major:

levothyroxine

Levothyroxine has a major potential interaction with Hyperthyroidism.

The use of thyroid hormones is contraindicated in patients with untreated thyrotoxicosis of any etiology, since thyroid hormones may exacerbate the condition.

Infection

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Infection.

Botulinum toxin products, including abobotulinumtoxinA, incobotulinumtoxinA, onabotulinumtoxinA, letibotulinumtoxinA, and others should not be used in the presence of infection at the proposed injection site(s) as it could lead to severe local or disseminated infection(s).

Myasthenia Gravis

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Myasthenia Gravis.

Treatment with botulinum toxin products, including abobotulinumtoxinA, incobotulinumtoxinA, onabotulinumtoxinA, daxibotulinumtoxinA, letibotulinumtoxinA and others can result in swallowing and breathing difficulties and in general increased neuromuscular compromise. Deaths due to severe dysphagia or respiratory failure have been reported after treatment with botulinum toxin. Care should be exercised with using these products in patients with pre- existing swallowing or respiratory disorders or peripheral motor neuropathic diseases or neuromuscular disorders (e.g., myasthenia gravis, amyotrophic lateral sclerosis), as they may be at increased risk of clinically significant effects including generalized muscle weakness, diplopia, ptosis, dysphonia, dysarthria, severe dysphagia and respiratory compromise. Patients treated with botulinum toxin may require immediate medical attention should they develop these complications. Caution is advised.

Pulmonary Impairment

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Pulmonary Impairment.

Treatment with botulinum toxin products, including abobotulinumtoxinA, incobotulinumtoxinA, onabotulinumtoxinA, daxibotulinumtoxinA, letibotulinumtoxinA and others can result in swallowing and breathing difficulties and in general increased neuromuscular compromise. Deaths due to severe dysphagia or respiratory failure have been reported after treatment with botulinum toxin. Care should be exercised with using these products in patients with pre- existing swallowing or respiratory disorders or peripheral motor neuropathic diseases or neuromuscular disorders (e.g., myasthenia gravis, amyotrophic lateral sclerosis), as they may be at increased risk of clinically significant effects including generalized muscle weakness, diplopia, ptosis, dysphonia, dysarthria, severe dysphagia and respiratory compromise. Patients treated with botulinum toxin may require immediate medical attention should they develop these complications. Caution is advised.

Seizures

Moderate:

levothyroxine

Levothyroxine has a moderate potential interaction with Seizures.

Thyroid hormones may alter the seizure threshold. Seizures have been reported rarely following the initiation of levothyroxine therapy. Therapy with thyroid hormones should be administered cautiously in patients predisposed to seizures.

Urinary Retention

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Urinary Retention.

Botox (brand of onabotulinumtoxinA), a botulinum toxin product for the treatment of overactive bladder or detrusor overactivity associated with a neurologic condition should not be used in patients who have a urinary tract infection, in patients with urinary retention and in patients with post-void residual urine volume >200 mL, who are not routinely performing clean intermittent self-catheterization.

Urinary Tract Infection

Major:

Botox

The onabotulinumtoxinA in Botox has a major potential interaction with Urinary Tract Infection.

Botox (brand of onabotulinumtoxinA), a botulinum toxin product for the treatment of overactive bladder or detrusor overactivity associated with a neurologic condition should not be used in patients who have a urinary tract infection, in patients with urinary retention and in patients with post-void residual urine volume >200 mL, who are not routinely performing clean intermittent self-catheterization.

More resources

Botox

A total of 148 drugs are known to interact with Botox.

levothyroxine

A total of 254 drugs are known to interact with levothyroxine.

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
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.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.