Dihydrotachystérol
vitamine D
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 12 déc. 2022
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Note de l'auteur clinique Michael Stewart 05/12/2022: AT10® oral drops were discontinued in the United Kingdom in January 2021. At the time of review there are no branded or generic products containing dihydrotachysterol available in the UK. Dihydrotachysterol may still be available in other countries. Other forms of vitamine D are available. This medicine leaflet is based on medical information available in the UK at the time of writing and is left here for reference purposes. Please also refer to the manufacturer's information supplied with your medicine.
Dihydrotachysterol is a type of vitamin D. It helps your body absorb calcium.
Make sure you understand how much to take and when to take it.
You will need to have regular blood tests while you are taking this medicine so that your doctor can make sure the dose is right for you.
Make sure you know the symptoms of too much calcium in your blood - these are losing your appetite, feeling thirsty, being sick (vomiting), feeling tired, and losing weight. See your doctor if you develop these symptoms.
En un coup d'œil
Dihydrotachysterol is a form of vitamin D used to treat low blood calcium caused by hypoparathyroidism.
Take this medicine exactly as your doctor tells you, using the dropper for measuring.
If you are allergic to peanuts or soya, you must not take this medicine.
You will need regular blood tests to ensure your dose is correct.
Signs of too much calcium, like tiredness or feeling sick, mean your dose may need adjusting.
If you experience symptoms of too much calcium, see your doctor straightaway.
About dihydrotachysterol
Type de médicament | Un type de vitamine D |
Utilisé pour | Low blood calcium levels due to hypoparathyroidism |
Aussi appelé | AT10® (discontinued) |
Disponible sous forme de | Oral solution (drops) |
Dihydrotachysterol is a form of vitamin D. Vitamine D helps you to absorb calcium from the foods you eat. You need calcium to keep your bones strong, and to help your muscles and nerves work properly. If you have a low level of calcium in your blood, it can cause a number of different symptoms, including muscle cramps, pain and twitching. Low levels of calcium can be caused by a problem with your parathyroid glands, called hypoparathyroidism. Dihydrotachysterol is used to treat low blood levels of calcium when caused by hypoparathyroidism.
Before taking dihydrotachysterol
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking dihydrotachysterol it is important that your doctor knows:
If you are allergic to peanuts or soya. If so, you must not take this medicine.
Si vous êtes enceinte ou si vous allaitez.
If you have sarcoidosis. This is a condition causing inflammation, particularly in your lungs and lymph system. Sarcoidosis may make you more sensitive to dihydrotachysterol than normal.
Si vous prenez 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 les médecines complémentaires.
Si vous avez déjà eu une réaction allergique à un médicament.
How to take dihydrotachysterol
Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The leaflet will give you more information about dihydrotachysterol and a full list of side-effects which you may experience from taking it.
Take dihydrotachysterol exactly as your doctor tells you to. It is likely you will be asked to take 3-5 ml for the first three days, and then your dose will be adjusted depending on the results of a blood test. You could then be asked to take a dose each day, on alternate days, or several times a week. Your doctor will tell you what is right for you, and how much to take for each of your doses.
Make sure you understand how to measure out your doses using the dropper. You can ask your doctor, nurse or pharmacist to explain this to you again if you are uncertain.
You can take dihydrotachysterol before or after meals.
Si vous oubliez de prendre une dose, prenez-la dès que vous vous en souvenez, sauf si l'heure de votre prochaine dose approche, auquel cas ignorez la dose oubliée. Ne prenez pas deux doses en même temps pour compenser une dose oubliée.
Tirer le meilleur parti de votre traitement
Keep your regular doctor's appointments so your progress can be monitored. You will need to have regular blood tests while you are taking this medicine to make sure that the dose you are taking is correct for you.
You should consider wearing a MedicAlert® bracelet (or similar), or carry some kind of ID with you, to identify yourself as having hypoparathyroidism. This is so that if you collapse, are confused or are injured, doctors will know that you need prompt treatment with calcium.
Eating foods rich in vitamin D and calcium may help, such as oily fish (sardine, herring, salmon and tuna), liver, dairy products and eggs.
If you buy any medicines, check with a pharmacist that they are suitable for you to take with dihydrotachysterol.
Treatment with dihydrotachysterol is usually long-term. Continue to take it regularly unless you are advised otherwise by your doctor.
If you are having an operation or dental treatment, tell the person carrying out the treatment that you are taking dihydrotachysterol.
Can dihydrotachysterol cause problems?
Along with their useful effects, medicines can cause unwanted side-effects although not everyone experiences them. Any side-effects caused by dihydrotachysterol are likely to be due to too much calcium in your blood, which means that your dose will need adjusting.
The first signs of too much calcium are:
Perte d'appétit.
Fatigue.
Sensation de nausée.
This could then lead on to:
Être malade (vomissements).
Crampes d'estomac.
Avoir soif.
Needing to pass urine more often.
Sueurs.
Vertiges.
Maux de tête.
If you experience these symptoms, it is important that you make an appointment to see your doctor straightaway.
How to store dihydrotachysterol
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.
Keep the bottle tightly closed and store in the original carton to protect it from light.
Discard any remaining contents four months after first opening the bottle. Write the date of opening on the label to remind you.
Informations importantes sur tous les médicaments
Informations importantes sur tous les médicaments
Never take more than the prescribed dose. If you suspect that you or someone else has taken an overdose of this medicine, go to the accident and emergency department of your local hospital. Take the container with you, even if it is empty.
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 Site web de Yellow Card.

Vous n'êtes pas sûr de mélanger des médicaments ?
Vérifiez les interactions possibles entre les médicaments, les compléments et les aliments avant de les prendre ensemble.
Questions fréquemment posées
What is hypoparathyroidism?
Hypoparathyroidism is a condition where low levels of calcium in the blood are caused by a problem with your parathyroid glands. Dihydrotachysterol is specifically used to treat low blood calcium when it is due to this condition.
How will my doctor determine the correct dose of dihydrotachysterol for me?
Initially, you will likely be prescribed 3-5 ml for the first three days. After this, your doctor will adjust your dose based on the results of blood tests. The frequency of doses, whether daily, on alternate days, or several times a week, will also be determined by your doctor to suit your individual needs.
Can I take other supplements or medicines with dihydrotachysterol?
If you buy any over-the-counter or herbal medicines, you should check with a pharmacist to ensure they are safe to take alongside dihydrotachysterol. It's important to inform your doctor about all medicines you are taking, including those without a prescription.
What should I do if I think I've taken too much dihydrotachysterol?
If you suspect that you or someone else has taken more than the prescribed dose of dihydrotachysterol, you should go to the accident and emergency department of your local hospital immediately. Remember to take the medicine container with you, even if it's empty.
How long will I need to take dihydrotachysterol?
Treatment with dihydrotachysterol is usually long-term. You should continue to take it regularly unless your doctor advises you otherwise.
Lectures complémentaires et références
- Médicaments Complets BNF 89e Édition; Association Médicale Britannique et Société Royale Pharmaceutique de Grande-Bretagne, Londres.
À propos de l'auteurVoir la biographie complète

Michael Stewart, MRPharmS
Responsable de l'examen des notices de médicaments – Contractuel, Pharmacien
BPharm (Hons), MRPharmS
Michael est un pharmacien communautaire exerçant dans les Midlands et le South Yorkshire avec plus de 20 ans d'expérience dans le conseil sur les médicaments et les conditions médicales. Il possède une solide expérience en formation dans le domaine de la santé, ayant produit et dispensé des cours de formation pour les équipes de pharmacie et le personnel des établissements de soins résidentiels, y compris les infirmières. Il a également contribué aux comités consultatifs de pharmacie pour la gestion des affections de faible gravité dans la communauté.
À propos du critique

Sid Dajani
Sultan Dajani a obtenu son diplôme à la London School of Pharmacy en 1994 et est devenu le plus jeune membre élu du conseil de la Royal Pharmaceutical Society depuis sa fondation en 1842.
Historique de l'article
Les informations sur cette page sont rédigées et examinées par des cliniciens qualifiés.
Article également disponible en Anglais, Allemand, Espagnol, Français, Italien, Portugais, Hindi, Hébreu, Arabe, and Suédois.
Next review due: 11 Jun 2027
12 déc. 2022 | Dernière version

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