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Comprimés et capsules de liothyronine

Cytomel

Liothyronine is a replacement thyroid hormone. It is used to treat the more severe conditions in which the thyroid doesn't produce enough thyroxine.

You will need regular blood tests to check your thyroid levels, particularly at the beginning of this treatment.

If you experience any side-effects, speak with your doctor, as your dose may need adjusting.

At a glance

  • Liothyronine is a medicine used to treat an underactive thyroid gland.

  • It works quickly by restoring the balance of thyroid hormone in your body.

  • Take liothyronine exactly as your doctor tells you, usually with water.

  • Your doctor will gradually increase your dose, taking it spaced out throughout the day.

  • You will need regular blood tests to check your thyroid levels during treatment.

  • If you have diabetes, check your blood glucose more often as this medicine can affect blood sugar.

  • Tell your doctor if you experience side-effects like palpitations, as your dose may need adjusting.

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About liothyronine

Type de médicament

A thyroid hormone

Utilisé pour

An underactive thyroid gland

Also known as

Cytomel® (USA); Liothyronine sodium

Disponible sous forme de

Tablets, capsules

If you have an underactive thyroid gland, it means that your thyroid does not produce enough thyroid hormone. This is a condition known as hypothyroïdie. Liothyronine restores the balance of thyroid hormone in your body. It is similar to thyroxine, the hormone which your body produces naturally. Although a medicine called lévothyroxine is usually prescribed in preference to liothyronine for people with this condition, liothyronine is given when a fast action is needed, as it works more quickly.

Some medicines are not suitable for people with certain conditions, and sometimes a medicine can only be used if extra care is taken. For these reasons, before you start taking liothyronine it is important that your doctor knows:

  • If you have heart or blood vessel disease, or a high blood pressure.

  • If you have either diabetes (diabetes mellitus) or diabetes insipidus.

  • Si vous prenez ou utilisez d'autres médicaments. Cela inclut tous les médicaments que vous prenez et qui sont disponibles à l'achat sans ordonnance, ainsi que les médicaments à base de plantes et complémentaires.

  • Si vous avez déjà eu une réaction allergique à un médicament.

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  • Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about liothyronine and will also provide you with a full list of the side-effects which you could experience from taking it.

  • Take liothyronine exactly as your doctor tells you to. It is usual for your doctor to give you a small dose (such as ½-1 tablet a day) when you first take liothyronine, and then for your dose to be gradually increased to two or three tablets daily, taken spaced out throughout the day.

  • Take the tablets with a drink of water. You can take liothyronine either before or after meals.

  • If you forget to take a dose, take it as soon as you remember. Try to take the correct number of doses each day but do not 'double up' to make up for any missed doses.

  • Try to keep your regular appointments with your doctor so that your progress can be monitored. You will need regular blood tests to check your thyroid levels, particularly in the early stages of your treatment.

  • Continue to take the tablets until your doctor tells you to stop.

  • If you have diabetes you may need to check your blood glucose more frequently as these tablets can affect the levels of sugar in your blood. Your doctor will advise you about this.

  • If you are due to have an operation or any dental treatment, please tell the person carrying out the treatment that you are taking liothyronine.

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Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the ones associated with liothyronine. You will find a full list in the manufacturer's information leaflet supplied with your medicine. Experiencing side-effects may be an indication that your dose needs adjusting, so speak with your doctor if you experience any of the symptoms listed below.

Liothyronine side-effects

Que puis-je faire si je ressens cela ?

Se sentir malade (nausée) ou être malade (vomissements)

Eat little and often. Stick to simple foods

Diarrhée

Buvez beaucoup d'eau pour remplacer les fluides perdus

Maux de tête

Buvez beaucoup d'eau et demandez à votre pharmacien de vous recommander un antidouleur approprié. Si les maux de tête persistent, informez votre médecin

The sensation of having a 'thumping' heart (palpitations) or chest pain

Let your doctor know about this as your dose may need adjusting

Feeling restless or shaky, flushing, sweating, difficulty sleeping, high temperature (fever), loss of weight, cramps, temporary loss of hair (in children), itchy rash

Si l'un de ces éléments devient problématique, parlez-en à votre médecin

Si vous ressentez d'autres symptômes que vous pensez être dus aux comprimés, parlez-en à votre médecin ou à votre pharmacien pour obtenir des conseils supplémentaires.

  • Gardez tous les médicaments hors de la portée et de la vue des enfants.

  • Conserver dans un endroit frais et sec, à l'abri de la chaleur et de la lumière directes.

Informations importantes sur tous les médicaments

Si vous achetez des médicaments, vérifiez avec un pharmacien qu'ils sont sans danger à prendre avec vos autres médicaments.

Ne prenez jamais plus que la dose prescrite. Si vous soupçonnez que vous ou quelqu'un d'autre avez pris une surdose de ce médicament, rendez-vous au service des urgences de votre hôpital local. Emportez le contenant avec vous, même s'il est vide.

Ce médicament est pour vous. Ne le donnez jamais à d'autres personnes, même si leur état semble être le même que le vôtre.

Ne gardez pas de médicaments périmés ou indésirables. Apportez-les à votre pharmacie locale qui s'en débarrassera pour vous.

Si vous avez des questions concernant ce médicament, demandez à votre pharmacien.

Signaler les effets secondaires d'un médicament ou d'un vaccin

Si vous ressentez des effets secondaires, vous pouvez les signaler en ligne via le Yellow Card website.

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Questions fréquemment posées

What is the main difference between liothyronine and levothyroxine?

Liothyronine is similar to thyroxine, the hormone your body naturally produces, and is used to restore the balance of thyroid hormone in your body. While levothyroxine is more commonly prescribed for an underactive thyroid, liothyronine is chosen when a faster action is needed because it works more quickly.

I have diabetes. How might liothyronine affect me?

If you have diabetes, liothyronine can affect your blood sugar levels. You may need to check your blood glucose more frequently when taking this medicine. Your doctor will provide specific advice on how to manage this.

What should I do if I forget to take a dose of liothyronine?

If you miss a dose of liothyronine, take it as soon as you remember. It's important to try and take the correct number of doses each day, but you should not 'double up' on doses to compensate for any that you have missed.

How will my doctor monitor my treatment with liothyronine?

Your doctor will want you to attend regular appointments to monitor your progress. This will include regular blood tests to check your thyroid hormone levels, especially during the initial stages of your treatment.

Are there any foods or drinks I should avoid while taking liothyronine?

The article states that you can take liothyronine either before or after meals, implying that it does not have specific food restrictions. It doesn't mention any particular foods or drinks to avoid while on this medication.

What should I do if I experience side-effects from liothyronine?

If you experience side-effects from liothyronine, it could be an indication that your dose needs adjustment. You should speak with your doctor about any symptoms, especially if they become troublesome or include palpitations, chest pain, restlessness, or a high temperature.

How should I store my liothyronine medicine?

Liothyronine should be stored in a cool, dry place. It's important to keep all medicines out of the reach and sight of children, and away from direct heat and light.

Can I take other medicines, including herbal remedies, with liothyronine?

Before you start taking liothyronine, it is important to inform your doctor about all other medicines you are taking. This includes any medicines available without a prescription, as well as herbal and complementary medicines. This ensures there are no unsafe interactions.

Lectures complémentaires et références

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About the authorView full bio

Author image

Michael Stewart, MRPharmS

Medicine Leaflet Review Manager – Contractor, Pharmacist

BPharm (Hons), MRPharmS

Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years’ experience advising on medicines and medical conditions. He has a strong background in healthcare training, having produced and delivered training courses for pharmacy teams and staff of residential care settings, including nurses. He has also contributed to pharmacy advisory boards for the management of low acuity conditions in the community.

About the reviewer

Author image

Sid Dajani

Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.

Historique de l'article

Les informations sur cette page sont rédigées et examinées par des cliniciens qualifiés.

  • Prochaine révision prévue : 19 janv. 2028
  • 19 janv. 2025 | Dernière version

    Dernière mise à jour par

    Michael Stewart, MRPharmS

    Revu par

    Sid Dajani
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