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Can Levothyroxine Cause Health Issues?

Does levothyroxine impact blood pressure?


  • Effective thyroid treatment
  • Replaces hormones
  • Prevents symptoms
£38.99 View Product


  • Contains a synthetic version of a thyroid hormone
  • Effective for treating hypothyroidism
  • Suitable for those who can't have Levothyroxine
£304.99 View Product

Does levothyroxine impact blood pressure?

You may have an increased risk of high blood pressure and fast heart rate if you take this drug with levothyroxine.[1]

  • Does levothyroxine raise blood pressure?

Is it better to take levothyroxine in the morning or at night? The best time of day to take levothyroxine is at a consistent time, preferably before you go to sleep (after not having eaten for 3 to 4 hours). If you take levothyroxine while you still have food in your stomach, it will not absorb properly.

What are the effects of taking too much levothyroxine?

Excess thyroid hormone may also trigger abnormal heart rhythms by causing the heart to beat harder and faster. One possible condition is atrial fibrillation, which is a disorganized rhythm in the heart's upper chambers. Palpitations, a sudden awareness of your heartbeat, is a related symptom.[2]

  • Can too much levothyroxine cause heart palpitations?

What does levothyroxine do to the body? Levothyroxine is used to treat an underactive thyroid (hypothyroidism). It replaces or provides more thyroid hormone in the body. Levothyroxine can help when the thyroid gland is not working properly and normally producing this hormone. Low thyroid hormone levels can be caused by natural causes, injury to the thyroid gland from radiation or medication, or removal of the gland by surgery.

What are the side effects of levothyroxine?

One of the main concerns with starting levothyroxine replacement is the precipitation of myocardial ischemia or arrhythmias. These events are rare, but they are known to occur. The usual recommendation for these patients is to start with low doses and gradually increase them until the patient reaches a euthyroid state.

  • Can levothyroxine cause irregular heartbeat?

Can you take levothyroxine without water? If the Levoxyl-branded tablet rapidly swells and disintegrates, it may cause choking or gagging if you accidentally inhale it. If you are experiencing difficulty swallowing the pill, please consult your doctor.

Is it possible to experience AFib as a result of taking too much levothyroxine?

If you take thyroid replacement hormone, a dose that's too high can cause the same issue. This is because your thyroid is underactive or your doctor removed it. A rapid heartbeat can lead to AFib, where the top chambers of your heart start to quiver and it can't pump as much blood as normal.[3]

  • Can too much levothyroxine cause AFib?

Can I drink milk an hour after taking levothyroxine? Patients should be advised not to take their thyroid hormone replacement therapy at the same time as cow's milk. New data presented at the Endocrine Society Annual Meeting suggests that this is the case. The data showed that if these two substances are ingested at the same time, it may reduce absorption of the medication.

Is it possible to have too much levothyroxine, which would then lead to palpitations?

Although it is rare, some people may have serious side effects when taking levothyroxine. If you experience chest pain, fast or irregular heartbeats, or palpitations, call a doctor immediately.

  • Can too much levothyroxine cause palpitations?

Are all brands of levothyroxine the same? There are several different brands of synthetic levothyroxine available. The following drugs are available in the United States: Levothroid, Levoxyl, Synthroid, Tirosint, and Unithroid; and in Canada: Eltroxin and Euthyrox. Even though these medications all have synthetic levothyroxine in them, they are not exactly the same.

What are the side effects of levothyroxine?

The doctor responded to the question. Although there are many causes of palpitations, they can occur if you are over-replaced on your thyroid hormone. This means that you are taking more thyroid hormones than you require. Taking too many thyroid hormones can cause your heart to beat faster than normal.[4]

  • Why does levothyroxine cause heart palpitations?

What are the effects of levothyroxine on the kidneys?

Thyroid hormone has numerous effects on the kidney, heart, and vascular system. Thyroid dysfunction can cause significant changes in renal and cardiovascular functions. In particular, hypothyroidism is known to be associated with reduced renal plasma flow and low glomerular filtration rate.[5]

  • Does levothyroxine affect the kidneys?
  • Does levothyroxine affect kidneys?

What are the side effects of levothyroxine?

An underactive thyroid can cause the kidneys to clean toxins from the blood at a reduced rate. A hypothyroid condition can further reduce blood flow through the kidneys, which negatively impacts kidney function and health. The narrowing of blood vessels in the kidneys.[6]

  • Does levothyroxine cause kidney damage?

What are the potential heart-related side effects of levothyroxine?

Among the patients with thyroid cancer, those who took either a lower or higher dose of levothyroxine were at an increased risk for both coronary heart disease and ischemic stroke.[7]

  • Can levothyroxine cause heart problems?

Can levothyroxine lead to heart problems?

The risk of having a heart attack was higher in patients who were already taking levothyroxine at the time of heart failure. The risk was lower in patients who started levothyroxine treatment after this diagnosis.[8]

  • Can levothyroxine cause heart issues?

What is the effect of levothyroxine on heart rate?

Treatment with levothyroxine has been shown to improve LDL cholesterol, total cholesterol, triglycerides, hypertension, diastolic dysfunction, heart rate and heart rate variability in exercise. It can also delay progression of atherosclerosis.[9]

  • Does levothyroxine increase heart rate?
  • Does levothyroxine affect heart rate?

What is the effect of levothyroxine on hair growth?

Working with your doctor to keep your condition under control with medication may prevent your hair from thinning or help it to regrow. Results may not be immediate because it takes some time for hair to develop and grow. Some possible medications for treating hypothyroidism are levothyroxine, Liothyronine, and liotrix.[10]

  • Will hair grow back after taking levothyroxine?
  • Will my hair grow back after taking levothyroxine?

Will levothyroxine thin your hair?

Ironically, taking the hormone levothyroxine to treat an underactive thyroid can contribute to some hair loss. This seems to be more common within the first month of treatment and more often in children than adults.[11]

Does levothyroxine make your hair fall out?Does levothyroxine cause hair loss?
Can too much levothyroxine cause hair loss?Can levothyroxine cause hair loss?
Does levothyroxine cause hair thinning?

Is it possible for levothyroxine to cause sleeplessness?

Yes, an underactive thyroid gland can make you feel tired all day. Some of the medications used to treat hypothyroidism may result in insomnia or the inability to fall and stay asleep. You should speak with your physician about your medication, including when you take it, to see if it may be the cause of your difficulty sleeping.[12]

  • Can levothyroxine cause sleeplessness?
  • Can levothyroxine affect sleep?

How does levothyroxine affect sleep?

If you are feeling restless or excitable, or if you have problems sleeping, these symptoms should improve as your body gets used to levothyroxine. Talk to your doctor if they last longer than a week or are severe. If you are experiencing symptoms that do not improve or seem to be worsening, please contact your doctor.

  • Does levothyroxine affect sleep?

Can an excess of levothyroxine lead to fatigue?

Symptoms of being overmedicated with thyroid medication can be similar to symptoms of hypothyroidism. You may feel more exhausted than usual, or achy and as if you have the flu; despite this, you may put on weight.[13]

  • Can too much levothyroxine make you tired?


  • https://www.medicalnewstoday.com/articles/levothyroxine
  • https://www.health.harvard.edu/heart-health/thyroid-hormone-how-it-affects-your-heart
  • https://www.webmd.com/heart-disease/atrial-fibrillation/afib-thyroid-disease-link
  • https://www.medicinenet.com/does_hypothyroidism_cause_palpitations/ask.htm
  • https://academic.oup.com/jcem/article/97/8/2732/2823325
  • https://www.boostthyroid.com/blog/2019/4/11/how-an-underactive-thyroid-affects-the-kidneys
  • https://www.targetedonc.com/view/levothyroxine-linked-to-heart-risks-in-patients-with-thyroid-cancer
  • https://www.thyroid.org/patient-thyroid-information/ct-for-patients/may-2019/vol-12-issue-5-p-9-10/
  • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5512679/
  • https://www.healthline.com/health/thyroid-and-hair-loss
  • https://www.everydayhealth.com/skin-and-beauty/thyroid-disease-and-hair-loss.aspx
  • https://www.healthgrades.com/right-care/thyroid-disorders/is-your-sluggish-thyroid-affecting-your-sleep-how-to-tell-and-what-you-can-do
  • https://www.verywellhealth.com/too-much-thyroid-medication-3233271
  • Levothyroxine

    • Effective thyroid treatment
    • Replaces hormones
    • Prevents symptoms
    £38.99 View Product


    • Contains a synthetic version of a thyroid hormone
    • Effective for treating hypothyroidism
    • Suitable for those who can't have Levothyroxine
    £304.99 View Product