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Levothyroxine 25mcg/5ml, 50mcg/5ml, 100mcg/5ml & 125mcg/5ml Oral Solution
Levothyroxine 25 micrograms/5ml Oral Solution
Levothyroxine 50 micrograms /5ml Oral Solution
Levothyroxine 100 micrograms/5ml Oral Solution
Levothyroxine 125 micrograms/5ml Oral Solution
1. What Levothyroxine Oral Solution is and what it is used for
2. What you need to know before you take Levothyroxine Oral Solution
3. How to take Levothyroxine Oral Solution
4. Possible side effects
5. How to store Levothyroxine Oral Solution
6. Contents of the pack and other information
Levothyroxine Oral Solution contains levothyroxine which is used to treat hypothyroidism, a condition in which the thyroid gland is underactive and so does not make enough thyroxine for the body’s needs.
Levothyroxine Oral Solution is also used to treat thyroid cancer and diffuse non toxic goitre or Hashimoto’s thyroiditis, conditions in which the thyroid gland becomes enlarged causing a swelling in the front of the neck.
Talk to your doctor before taking Levothyroxine Oral Solution:
Blood pressure will be regularly monitored when levothyroxine treatment is started in very low birth weight preterm neonates because rapid fall in blood pressure (known as circulatory collapse) may occur.
Thyroid hormones are not suitable for weight reduction. Intake of thyroid hormones will not reduce your weight, if your thyroid hormone level is in a normal range. Serious or even life threatening side effects may occur if you increase the dose without special advice from your doctor, especially when taken together with other medicines for weight reduction.
Thyroid imbalance may occur if you need to change your medication to another levothyroxine containing product. Talk to your doctor if you have any questions about changing your medication. A close monitoring (clinical and biological) is required during the transition period.
You should tell your doctor if you get any side effects as this may indicate that your dose needs to be adjusted down.
If you are about to undergo laboratory testing for monitoring your thyroid hormone levels, you must inform your doctor and/or the laboratory personnel that you are taking or have recently taken biotin (also known as vitamin H, vitamin B7 or vitamin B8). Biotin may affect results of your laboratory tests. Depending on the test, the results may be falsely high or falsely low due to biotin. Your doctor may ask you to stop taking biotin before performing laboratory tests. You should also be aware that other products that you may take, such as multivitamins or supplements for hair, skin, and nails could also contain biotin. This could affect the results of laboratory tests. Please inform your doctor and/or the laboratory personnel, if you are taking such products (Please note the information in the section “Other medicines and Levothyroxine Oral Solution” below).
Please tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines, including medicines without a prescription.
Levothyroxine can interfere with the action of some other drugs and some drugs can have an effect on levothyroxine.
In particular tell your doctor or pharmacist if you take the following drugs:
Levothyroxine Oral Solution can be taken with these medicines but not at the same time.
Proton pump inhibitors (such as omeprazole, esomeprazole, pantoprazole, rabeprazole and lansoprazole) are used to reduce the amount of acid produced by the stomach, which may reduce the absorption of levothyroxine from the intestine and thereby make it less effective. If you are taking levothyroxine while receiving treatment with proton pump inhibitors, your doctor should monitor your thyroid function and may have to adjust the dose of Levothyroxine Oral Solution.
If you are taking or have recently taken biotin, you must inform your doctor and/ or the laboratory personnel when you are about to undergo laboratory testing for monitoring your thyroid hormone levels. Biotin may affect the results of your laboratory tests (see “Warnings and precautions”).
If you go into hospital to have an operation, tell the anaesthetist or the medical staff that you are taking Levothyroxine Oral Solution. It may react with an anaesthetic (ketamine) which you may be given before an operation.
You should take your Levothyroxine Oral Solution on an empty stomach, usually before breakfast.
Ask your doctor or pharmacist for advice before taking any medicine.
If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine.
If you are pregnant while taking this medicine your doctor will monitor you closely.
Levothyroxine Oral Solution is unlikely to affect your ability to drive or to operate machinery.
Levothyroxine Oral Solution contains sodium methyl parahydroxybenzoate (E219) which may cause allergic reactions (possibly delayed). It also contains glycerol which may cause headache, stomach upset and diarrhoea.
Always take this medicine exactly as your doctor has told you. Check with your doctor if you are not sure. Levothyroxine Oral Solution should be swallowed.
Your doctor will have decided what dose you should take each day depending on your condition. Your doctor will take blood samples at regular intervals to monitor your response to treatment.
If you are switching from the oral solution to the tablet version of levothyroxine or from the tablet version to the oral solution of levothyroxine your doctor will monitor you more closely.
You should take your Levothyroxine Oral Solution on an empty stomach, usually before breakfast. For hypothyroidism the usual daily dosages are:
The starting dose is 50 to 100 micrograms (mcg) a day, increasing by 25 to 50 micrograms every 3-4 weeks, until you are taking the right amount for your condition. The usual maintenance dose is 100 to 200 micrograms daily. For diffuse non toxic goitre or Hashimoto’s thyroiditis the recommended dose is 50-200 micrograms (mcg) per day.
For the treatment of thyroid cancer the recommended dose is 150-300 micrograms (mcg) per day.
The starting dose is 12.5 micrograms (mcg) a day, increasing by 12.5 micrograms every 2 weeks until the correct dose is obtained. The usual final dose is between 50 and 200 micrograms daily. This dose also applies to patients with severe hypothyroidism, and to those with heart disease.
The dose for children depends on their age or weight. They will be monitored to make sure they get the right dose. The following is a guide:
Age Micrograms per kg bodyweight
Up to 1 month 5-10 micrograms
Over 1 month 5 micrograms
The duration of treatment is usually for life if you are being treated for hypothyroidism, non toxic diffuse goitre or Hashimoto’s thyroiditis.
Please use the oral syringe provided to deliver your specific dose (see instructions below). The syringe can be used to measure your dose by drawing the liquid to the correct mark on the syringe. For example if your dose is 50 micrograms daily then the corresponding volume would be:
For the 25 micrograms/5ml strength – 2 x 5ml (10ml in total)
For the 50 micrograms/5ml strength – 5ml
For the 100 micrograms/5ml strength – 2.5 ml
For the 125 micrograms/5ml strength – 2 ml
Levothyroxine can be taken using an oral syringe.
1. Shake the bottle well, making sure the cap is firmly on the bottle.
2. Remove the cap. Note: Keep the cap nearby to close the bottle after each use.
3. Push the plastic adaptor into the neck of the bottle. Note: The adaptor must always stay in the bottle.
4. Take the syringe and check the plunger is fully down.
5. Keep the bottle upright and insert the oral syringe firmly into the plastic adaptor.
6. Turn the whole bottle with the syringe upside down.
7. Slowly pull the plunger down fully so that the syringe fills with medicine.
Push the plunger back up completely to expel any large air bubbles that may be trapped inside the oral syringe.
8. Then pull the plunger slowly back to the volume you need for your dose.
9. Turn the whole bottle with the syringe the right way up and take the syringe out of the bottle.
10. The dose of medicine can now be swallowed directly from the oral syringe. Please ensure that you are sitting upright and the plunger must be pushed slowly to allow you to swallow the dose.
11. Replace the child resistant cap after use, leaving the adaptor in place.
12. Cleaning: After use, wipe the outside of the syringe with a dry, clean tissue.
Note: If necessary, Levothyroxine Oral Solution can be administered via a nasogastric feeding tube that should be rinsed twice with 10 ml of water immediately after administration.
If you accidentally take an overdose of your medicine, either call your doctor straight away, or go to your nearest hospital casualty department. Symptoms of overdose include fever, irregular heartbeat, muscle cramps, headache, restlessness, flushing, sweating or diarrhoea. Always take any remaining medicine, the container and the label with you, so that the medicine can be identified.
If you forget to take your medicine, take your dose when you remember and then take your next dose at the usual time. Do not take a double dose to make up for a forgotten dose. If you have forgotten several doses tell your doctor when you have your next check-up or blood test.
It can be dangerous to stop taking your medicine without your doctor‘s advice.
If you are worried ask your doctor or pharmacist for advice.
If you have any further questions on the use of this medicine, ask your doctor.
Like all medicines, this medicine can cause side effects, although not everybody gets them. These usually happen if the dose you are taking is too high.
Tell your doctor if you have any of the following side effects while you are taking this medicine.
These are all very serious side effects. If you have them, you may have a serious allergic reaction to Levothyroxine Oral Solution. You may need urgent medical attention or hospitalisation. All of these very serious side effects are very rare.
Tell your doctor if you notice any of the following: Fast or irregular heartbeats, palpitations, chest pain, muscle cramps or weakness, headache, restlessness, excitability, flushing, sweating, diarrhoea, vomiting, fever, menstruation problems, tremor, sleeplessness, heat intolerance and excessive weight loss. Rash, itching and puffiness may also occur.
Very rarely, if far too much Levothyroxine Oral Solution has been taken in one go or over many years, the heart may fail and coma and death have been reported. If you feel unwell in any other way, tell your doctor as soon as you can.
Children may have some hair loss at the beginning of treatment, however this is usually temporary and the hair returns.
Do not be alarmed by this list of possible events. You may not have any of them.
If you get any side effects, talk to your doctor or pharmacist. This includes any side effects not listed in this leaflet.
If you get any side effects, talk to your doctor or pharmacist. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the Yellow Card Scheme at: www.yellowcard.mhra.gov.uk or search for MHRA Yellow Card in the Google Play or Apple App Store.
By reporting side effects you can help provide more information on the safety of this medicine.
Keep this medicine out of the sight and reach of children.
Do not store above 25˚C.
Store in the original package in order to protect from light.
Dispose of any remaining medicine 2 months after opening.
Do not use this medicine after the expiry date which is stated on the label and carton after EXP (month, year). The expiry date refers to the last day of that month.
Levothyroxine Oral Solution is colourless and odourless. Do not use this medicine if you notice that the solution has a colour and/or an odour. Talk to your pharmacist.
Do not throw away any medicines via wastewater or household waste.
Ask your pharmacist how to throw away medicines you no longer use.
These measures will help protect the environment.
Levothyroxine Oral Solution is a clear, colourless and odourless liquid. Each bottle contains 100ml of oral solution.
Levothyroxine oral solution is packed in an amber glass bottle, with a child-resistant, tamper-evident screw cap. A 5 ml graduated oral dosing syringe and a “press-in” syringe/bottle adaptor are also provided.
This leaflet was last revised in January 2023