When taken at the correct dose, levothyroxine is generally safe for lifelong use. Life-long side effects are typically associated with an incorrect dosage (either too high or too low, leading to symptoms of hyperthyroidism or persistent hypothyroidism, respectively).
Side effects that you should report to your care team as soon as possible: Allergic reactions—skin rash, itching, hives, swelling of the face, lips, tongue, or throat. Anxiety, nervousness. Excessive sweating or sensitivity to heat.
Yes, it's safe to take levothyroxine for a long time, even many years. However, high doses of levothyroxine over a long time can sometimes cause weakening of the bones (osteoporosis). This should not happen if you are on the right dose. It's important to have regular blood tests to make sure your dose is not too high.
Call your doctor right away if you or your child has rapid or irregular heartbeats, chest pain, leg cramps, headaches, nervousness, irritability, sleeplessness, tremors, a change in appetite, weight gain or loss, vomiting, diarrhea, excessive sweating, heat intolerance, a fever, changes in menstrual periods, hives, or ...
You'll have regular blood tests to check you're on the right dose of levothyroxine. Being on the wrong dose can cause side effects, such as feeling or being sick, diarrhoea, headaches or problems sleeping. If you have any side effects, talk to your GP or a pharmacist.
Abstract. Background: Some levothyroxine (LT4)-treated hypothyroid patients report a constellation of persistent and distressing cognitive symptoms that has been termed brain fog.
Doctors will ask about your headaches, like how often they happen and how long they last. They might use headache diaries to track your headaches and find what might cause them. Thyroid-related headaches often feel dull and throbbing. They might also make you feel sick or affect your vision.
Both hypothyroidism and hyperthyroidism affect bowel movements, but in different ways. An underactive thyroid can cause constipation and an overactive thyroid can cause more frequent bowel movements.
Symptoms of taking too much levothyroxine include a fast heart rate, anxiety, and trouble sleeping. If you're prescribed levothyroxine, it's possible to take too much by accident, so follow your healthcare provider's directions.
Levothyroxine may cause mood changes. This is because thyroid hormones affect chemical messengers in areas of the brain that control emotion and mood. If you notice you're feeling more nervous, irritable, or anxious while taking levothyroxine, talk to your prescriber.
If side effects bother you and you wonder if you should keep taking a medicine, call your doctor. Your doctor may be able to lower your dose or change your medicine. If you have had a bad allergic reaction to a medicine before and are exposed to it again, watch for symptoms. Treat any symptoms as an emergency.
Warnings for people with certain health conditions
For people with heart problems: Levothyroxine can increase your risk of serious heart problems, such as heart attack, abnormal heart rhythm, and heart failure. This risk is increased if you've already had these problems.
Levothyroxine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
Conclusions: Hypersensitivity to levothyroxine is rare and most patient with reaction to levothyroxine tolerated to alternative thyroxine preparation. It is hypothesized that levothyroxine allergy is likely due to the excipients or fillers rather than the thyroid hormone itself.
A common symptom of an underactive thyroid is weight gain, often around the abdomen. However, the American Thyroid Association states that the weight gain may not necessarily be due to the build up of fat, but the accumulation of salt and water.
Daily habits such as irregular sleep, skipped meals, and stress can harm thyroid function. Improving your routine can offer significant relief and support hormonal recovery.
What are the best exercises for hypothyroidism?
Hypothyroid myopathy presents with nonspecific symptoms of myalgias, muscle cramps, fatigue, and muscle weakness, particularly exacerbated with exertion and exercise.
Levothyroxine, prescribed for hypothyroidism, may be associated with bone loss in older adults, even when following current guidelines. Levothyroxine is the second most commonly used prescription medication among older adults in the U.S. Approximately 23 million Americans take levothyroxine daily. Elena Ghotbi, M.D.
Does Hypothyroidism Affect Life Expectancy? With proper treatment, a person with hypothyroidism usually has a normal life expectancy, with little or no decrease in quality of life. 1 Hypothyroidism generally carries a greater life expectancy than hyperthyroidism (overactive thyroid).
An overactive thyroid can also cause the following physical signs:
Get Smart About Sleep
You might feel run down, even if you're taking medication. Yet all too often, “people with hypothyroidism don't get enough sleep, or the sleep they're getting isn't good quality,” Hatipoglu says. To ensure your body has a chance to rest and recover: Aim for 8 hours of sleep every night.
One of the most common medication-based thyroid treatments used today is called levothyroxine. According to a presentation by the Neurology Times, hypothyroid patients using levothyroxine saw a decrease in both the severity and frequency of their chronic thyroid headache.