
Levothyroxine is a medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. It is also used to treat thyroid cancer. While levothyroxine is safe to take during pregnancy and breastfeeding, it is not meant to be used for weight loss. In fact, when taken in large amounts, levothyroxine may cause serious side effects, especially when taken with amphetamines. It is important to discuss any other medications or supplements with your doctor before taking levothyroxine, as certain substances can interfere with its absorption and effectiveness. So, which diet pills are safe to take with levothyroxine?
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What You'll Learn

Levothyroxine and weight loss medications
Levothyroxine is a prescription medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. It is also used to help decrease the size of enlarged thyroid glands and treat certain types of thyroid cancer. While levothyroxine can cause weight loss as a side effect, it is not recommended for the treatment of obesity or weight loss. When taken in large amounts, it may cause serious side effects.
When considering weight loss medications, it is important to be aware of potential interactions with levothyroxine. Orlistat, an oral weight-loss medication that prevents the absorption of fat, can interfere with the absorption of levothyroxine. It is recommended to separate the two medications by at least four hours. Similarly, iron supplements can form a bond with levothyroxine, hindering its absorption, hence they should also be taken at least four hours apart.
Additionally, certain foods and beverages can affect how levothyroxine works. Coffee, milk, soy products, walnuts, and dietary fiber can reduce levothyroxine levels when consumed too close to the dose. It is advisable to avoid these foods and drinks for at least an hour after taking levothyroxine. Grapefruit and grapefruit juice may also impact the medication, so it is important to consult a doctor before consuming them.
Vitamins and supplements containing calcium, magnesium, or iron can interfere with levothyroxine absorption. These should be taken at least four hours after thyroid medication to prevent interaction. It is crucial to inform your healthcare provider about all the medicines, vitamins, and supplements you are taking to ensure safe and effective use.
While weight loss medications may interact with levothyroxine, it is important to note that levothyroxine itself is not a weight loss drug and should not be used for that purpose. If you are considering weight loss medications or making dietary changes while taking levothyroxine, consult your healthcare provider to ensure a safe and effective approach.
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Thyroid medication and food/drinks
Levothyroxine is a medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. It is also used to decrease the size of enlarged thyroid glands and treat thyroid cancer when combined with surgery and radioiodine treatment. This medicine is available only with a doctor's prescription.
When taking levothyroxine, it is important to be cautious about the following foods and drinks:
- Soybeans and soy products: Some people with thyroid conditions may be advised to limit their soy intake. Soybeans and soy products can affect how levothyroxine works in the body.
- Walnuts: Like soybeans, walnuts may interfere with the effectiveness of levothyroxine.
- High-fiber foods: Eating a high-fiber meal along with thyroid medication can increase thyroid-stimulating hormone (TSH) levels due to decreased absorption of the medication. High-fiber foods include whole grains, legumes, fruits, vegetables, nuts, and seeds.
- Iodine-rich foods: There is some research suggesting that consuming iodine-rich foods while taking thyroid medication can reduce its effectiveness. Examples of iodine-rich foods include seafood, dairy products, and iodized salt.
- Coffee and tea: Caffeinated beverages like coffee and tea can interact with thyroid medication. It is recommended to wait a few hours after taking thyroid medication before consuming coffee or tea.
- Alcohol: While alcohol does not directly interfere with thyroid medication, excessive alcohol consumption can negatively impact overall health and thyroid function. It is advisable to limit alcohol intake when taking levothyroxine.
It is important to note that the recommendations regarding diet and thyroid medication may vary depending on individual circumstances. Always consult with a doctor or pharmacist to determine the most appropriate diet plan while taking levothyroxine.
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Levothyroxine and vitamins/minerals
Levothyroxine is a synthetic version of the hormone thyroxine, which is produced by the thyroid gland. It is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. This medication is also used to decrease the size of enlarged thyroid glands and treat certain types of thyroid cancer. It is important to note that levothyroxine should not be used for weight loss or obesity treatment.
When taking levothyroxine, it is crucial to be cautious about consuming certain vitamins and minerals. Here are some key considerations:
- Multivitamins with Minerals: Combining multivitamins with minerals and levothyroxine may reduce the effectiveness of the medication. It is recommended to separate the intake of levothyroxine and multivitamins by at least four hours. If prescribed together, a dose adjustment or special test may be required to ensure safe use.
- Calcium Supplements: Calcium supplements can interfere with the absorption of levothyroxine. To avoid this interaction, it is advised to take calcium supplements at least four hours after taking levothyroxine or maintain an even longer gap between the two.
- Vitamin C: While vitamin C does not need to be avoided, individuals on a stable dose of levothyroxine should consult their doctor before introducing vitamin C to their routine.
- Vitamin D: Vitamin D supplementation may decrease TSH and certain thyroid antibody levels in people with Hashimoto's thyroiditis and low vitamin D levels. However, high doses of vitamin D may increase the risk of autoimmune thyroid disease in individuals who already have sufficient vitamin D levels.
- Chromium Picolinate: Preliminary evidence suggests that chromium picolinate may reduce the absorption of levothyroxine. As a precaution, it is recommended to separate the intake of chromium picolinate and levothyroxine by at least four hours.
- Soy: Soy products, including soy protein powders and soy isoflavones found in some menopause supplements, can impact the absorption of thyroid hormones.
- Iodine: Iodine supplements are not beneficial for improving thyroid function unless there is an iodine deficiency.
- Kelp: Kelp, a type of seaweed, can contain high levels of iodine, which can exacerbate an underactive thyroid. Avoid supplements containing kelp while taking levothyroxine.
It is important to consult a doctor or pharmacist before taking any vitamins or minerals alongside levothyroxine. They can advise on potential interactions, adjustments to dosage, or timing recommendations to ensure safe and effective use.
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Levothyroxine and pregnancy
Levothyroxine is a medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Thyroid hormones help your muscles, brain, and heart to function normally. They also affect how well your stomach works and ensure your bones remain strong.
Levothyroxine is considered safe to take while trying to become pregnant, during pregnancy, and while breastfeeding. It is important to carry on taking levothyroxine throughout your pregnancy. Having too low or too high levels of thyroid hormone in pregnancy can cause problems for you and your baby. You will need to have regular blood tests during pregnancy to ensure you are on the right dose of levothyroxine. Your doctor may need to increase your dose of levothyroxine while you are pregnant.
If you are taking the combined pill or progestogen-only pill and experience vomiting or severe diarrhoea for over 24 hours while taking levothyroxine, your contraceptive pills may not protect you from pregnancy. If this happens, follow the instructions in the leaflet that comes with your contraceptive pills.
Studies have shown that increasing levothyroxine doses early in pregnancy is associated with a lower risk of pregnancy loss in hypothyroid women. Untreated hypothyroidism during pregnancy is associated with a higher rate of complications, including spontaneous abortion, pre-eclampsia, stillbirth, and premature delivery.
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Levothyroxine and other medications
Levothyroxine is a prescription medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. It is also used to treat thyroid cancer and goitre, an enlargement of the thyroid gland. This medication is typically taken orally, in the form of tablets, capsules, or liquid, and should be taken on an empty stomach at least 30 minutes to one hour before eating.
It is important to note that levothyroxine interacts with many other medications and substances, and should not be used for weight loss purposes. When taken in large amounts, it may cause serious side effects, especially when combined with amphetamines. Therefore, it is crucial to inform your doctor about any other medications or supplements you are taking, including over-the-counter products, vitamins, and minerals.
Interactions with Other Medications
Levothyroxine has been found to interact with several other medications, and these interactions can influence the absorption and effectiveness of levothyroxine. Here are some of the key interactions to be aware of:
- Bile acid sequestrants, such as cholestyramine, colestipol, and colesevelam, which are used to treat high cholesterol.
- Proton pump inhibitors (PPIs), including esomeprazole, lansoprazole, omeprazole, pantoprazole, and rabeprazole, used to treat chronic heartburn and gastroesophageal reflux disease (GERD).
- Orlistat, an oral weight-loss medication that interferes with fat absorption in the body.
- Iron supplements, including ferrous sulfate, ferrous fumarate, and ferrous gluconate, which can bond with levothyroxine and prevent its absorption.
- Calcium-containing products, such as calcium carbonate, and magnesium-containing supplements, which can decrease the absorption of levothyroxine.
- Antacids, such as sucralfate.
- Weight-loss medications, such as diethylpropion, phendimetrazine, or phentermine.
- Estrogen, found in birth control pills and hormone replacement therapy.
- Coffee, milk, soy products, walnuts, and dietary fiber can also reduce the absorption of levothyroxine, so it is recommended to avoid consuming these within an hour of taking levothyroxine.
Precautions and Side Effects
In addition to medication interactions, levothyroxine may also cause side effects, especially if the dosage is too high. Common side effects include symptoms similar to an overactive thyroid, such as restlessness, excitability, insomnia, and muscle aches. Other side effects may include nausea, vomiting, diarrhoea, and dehydration. It is important to consult a doctor if any of these side effects occur or if you are pregnant or breastfeeding.
Furthermore, it is important to maintain consistency when taking levothyroxine. Switching between different brands or generics of the medication can affect its absorption and effectiveness. Always consult your doctor or pharmacist before making any changes to your medication.
In summary, levothyroxine interacts with a wide range of medications and substances, and it is crucial to inform your healthcare provider about any other substances you are taking to ensure safe and effective use of levothyroxine.
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Frequently asked questions
Diet pills are oral medications that are used to suppress appetite, reduce fat absorption, or speed up metabolism, with the goal of aiding weight loss.
No, levothyroxine is a prescription medication used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. While it can help with weight gain caused by hypothyroidism, it is not meant to be used for weight loss or obesity treatment.
Yes, certain weight loss medications can interfere with levothyroxine absorption or cause serious side effects when taken together. These include Orlistat (Xenical, Alli), diethylpropion, phendimetrazine, and phentermine (Adipex-P, Lomaira, Qsymia).
It is important to consult a healthcare professional before taking any diet pills with levothyroxine. Some weight loss medications can interfere with the absorption of levothyroxine, leading to reduced effectiveness. Additionally, levothyroxine may cause serious problems when taken in large doses, especially when combined with certain stimulants or amphetamines.











































