Euthyrox

Levothyroxine isn't known to cause weight gain as a side effect. But it’s still possible for you to gain weight while taking it. In most cases, this happens because your dose might be too low. This means your thyroid hormone levels haven't reached the target range. If you notice unexpected or concerning weight gain, talk to your prescriber. They might check your hormone levels and adjust your dose if needed.

It can take about 4 to 6 weeks after starting levothyroxine to feel the full benefits of the medication. Some people might notice their symptoms begin to improve sooner, but results can vary. In the beginning, it might take several weeks to find the dose that works best for you. Your prescriber will check your thyroid hormone levels from time to time. They might also raise your dose slowly to help avoid side effects like headache and nausea. If you’re not sure whether the medication is working, ask your prescriber for guidance.

Levothyroxine is usually taken in the morning, at least 30 minutes before breakfast. This helps your body absorb the medication better because your stomach is empty. But some research shows that taking it at night can work just as well, as long as you separate it from food and other medications.

You might need to take levothyroxine and your other medications at different times to avoid interactions. How long you should wait depends on the medication. For example, take antacids like Tums, wait at least 4 hours before or after taking levothyroxine. Some medications can lessen how much levothyroxine gets absorbed into the body, making it work less well. Others might increase how much levothyroxine stays in your body, which can lead to symptoms of hyperthyroidism. Ask your pharmacist or prescriber if you need to separate your medications.

You might experience some hair loss during the first few months of starting levothyroxine. This side effect is usually temporary and tends to get better with time. Talk to your prescriber if you're concerned about hair loss or if it doesn't improve.

Make sure to take levothyroxine at least 4 hours after your last meal. Eating too soon after taking your dose can affect how well your body can absorb the medication. Foods that are high in fiber, soy products, and walnuts can reduce how much of the medication your body takes in. That’s why it’s generally recommended to take levothyroxine 30 minutes to 1 hour before food, on an empty stomach.

If you stop taking levothyroxine, your low thyroid symptoms will likely return and might even get worse over time. This happens because your body is no longer getting the thyroid hormones it needs to function properly. Don't stop taking levothyroxine without first speaking with your prescriber.