Comprimés de cobicistat pour le VIH
Tybost
Revu par Sid DajaniDernière mise à jour par Michael Stewart, MRPharmSDernière mise à jour 20 juil. 2022
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Cobicistat is one of a number of medicines that you will need to take regularly for HIV.
Take one tablet each day.
Swallow the tablet with a drink of water after a meal.
Clinical Author's Note (Michael Stewart) 18/07/2018: new data shows that women who are pregnant and are taking cobicistat in combination with darunavir (Rezolsta® or Symtuza®) have lower blood levels of the medicines compared to other patients. This means there may be a risk of the treatment not working properly and of HIV being passed on to the unborn child. Women who are pregnant or may become pregnant should not take cobicistat/darunavir combinations and should speak to their doctor about alternative treatments. For more information please refer to the MHRA advice for healthcare professionals.
En un coup d'œil
Cobicistat is a medicine for adults and children aged 12 or over with HIV infection.
It boosts the effectiveness of other HIV medicines like atazanavir or darunavir.
Take one tablet daily, after a meal, at the same time as atazanavir or darunavir.
Continue taking your medicine regularly to prevent HIV from becoming resistant.
Common side-effects include feeling sick and yellowing of skin or eyes.
If you have concerning side-effects or distressing thoughts, speak to your doctor.
About cobicistat
Type de médicament | A pharmacokinetic enhancer |
Utilisé pour | Increasing the effect of atazanavir ou darunavir, which are medicines used for HIV infection. Cobicistat can be used in adults and in children aged 12 years or older. |
Aussi appelé | Tybost®; |
Disponible sous forme de | Comprimés |
Cobicistat is prescribed for infection par le virus de l'immunodéficience humaine (VIH). HIV destroys cells in the body, called CD4 T cells. These cells are a type of white blood cell and are important because they are involved in protecting your body from infection. If left untreated, the HIV infection weakens your immune system so that your body cannot defend itself against bacteria, viruses and other germs. You will be prescribed three or more antiretroviral medicines at the same time, as taking a combination of different medicines is more effective than taking one alone, and also it reduces the risk that the HIV virus will become resistant to any individual medicine. Antiretroviral medicines slow the progress of HIV infection, but do not cure it.
Cobicistat will be prescribed for you by a doctor who is a specialist. You will also have been prescribed either atazanavir or darunavir for the HIV infection. Cobicistat is given to boost the effect of these medicines. Atazanavir and darunavir are both protease inhibitor antiretroviral medicines. Cobicistat helps to improve the effectiveness of these medicines by slowing down their breakdown in the body. This increases the amount of time atazanavir or darunavir is present in your body.
Some brands of cobicistat contain other antiretroviral medicines also (see the list in the table above). Taking one of these brands helps to reduce the number of tablets you need to take each day. Not all of the information in this leaflet applies to the combination brands - please refer to the manufacturer's printed information leaflet from inside the pack for full details about these brands. You will also find more information about each of the individual medicines on our website (see atazanavir, darunavir, emtricitabine, tenofovir).
Before taking cobicistat
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 cobicistat it is important that your doctor knows:
Si vous êtes enceinte, essayez d'avoir un bébé, ou allaitez.
If you have any problems with the way your liver works, or if you have problems with the way your kidneys work.
Si vous avez déjà eu une réaction allergique à un médicament.
Si vous prenez d'autres médicaments. Cela inclut tous les médicaments disponibles à l'achat sans ordonnance, ainsi que les médicaments à base de plantes et les médecines complémentaires.
How to take cobicistat tablets
Before you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about cobicistat, and it will also provide you with a full list of the side-effects which you could experience from taking it.
Take cobicistat exactly as your doctor tells you to. Take one tablet a day, at the same time as either atazanavir or darunavir.
Swallow the tablet whole with a drink of water. Take the tablet after a meal or a snack.
If you forget to take a dose, take it as soon as you remember, providing it is within 12 hours of the time you should have taken it. Remember to take the tablet with something to eat. However, if when you remember, it is more than 12 hours late, do not take the dose you missed but instead take your next dose when it is due. Do pas take two doses together to make up for the forgotten dose.
Tirer le meilleur parti de votre traitement
Keep your regular appointments with your doctor so that your progress can be monitored. You are likely to need regular blood tests to check how well your medicines are working.
It is important that you continue to take your antiretroviral treatment regularly. This will help to prevent the HIV from becoming resistant to the medicines you are taking. Even if you miss only a small number of doses, the virus can become resistant to treatment.
If you develop an infection soon after you start the treatment, let your doctor know. As a result of taking antiretroviral medicines, your immune system may start fighting an infection which was present before you started the treatment, but which you may not have been aware of.
Bien que le traitement avec des médicaments antirétroviraux puisse réduire le risque de transmission du VIH à d'autres par contact sexuel, il ne l'élimine pas. Il est important d'utiliser des préservatifs.
If you are trying for a baby or you become pregnant whilst taking cobicistat, let your doctor know straightaway. Your doctor may recommend a different treatment combination that could be more effective during pregnancy.
Il n'est pas rare que les personnes vivant avec le VIH se sentent déprimées ou même dépressives, surtout peu de temps après le diagnostic et le début du traitement. Si vous ressentez des symptômes de dépression ou avez des pensées inquiétantes concernant l'automutilation, vous devriez en parler à votre médecin immédiatement.
If you are having an operation or dental treatment, tell the person carrying out the treatment that you are taking cobicistat and antiretroviral medicines.
If you buy any medicines, supplements or herbal remedies 'over the counter', check with a pharmacist that they are suitable to take with cobicistat and your other medicines. This is because cobicistat can interfere with some medicines and stop them from working properly.
Can cobicistat tablets cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with cobicistat. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Very common cobicistat side-effects (these affect more than 1 in 10 people) | Que puis-je faire si je ressens cela ? |
Sensation de malaise (nausée) | Optez pour des repas simples - évitez les aliments gras ou épicés |
Yellowing of your skin or the whites of the eyes (jaundice) | Speak with your doctor as soon as possible |
Common cobicistat side-effects (these affect fewer than 1 in 10 people) | Que puis-je faire si je ressens cela ? |
Maux de tête | Buvez beaucoup d'eau et demandez à un pharmacien de vous recommander un antidouleur approprié. Si les maux de tête persistent, informez votre médecin |
Feeling dizzy, tired or sleepy | Ne conduisez pas et n'utilisez pas d'outils ou de machines lorsque vous êtes affecté |
Being sick (vomiting), diarrhoea, stomach pain, indigestion, wind | Optez pour des repas simples - évitez les aliments gras ou épicés |
Increased appetite, changes in the way things taste, dry mouth, rash, difficulty sleeping, abnormal dreams | Si l'un de ces éléments devient problématique, parlez-en à votre médecin |
Modifications à certains tests sanguins | Votre médecin vérifiera ces éléments |
Si vous ressentez d'autres symptômes que vous pensez être dus au médicament, parlez-en à votre médecin ou à votre pharmacien pour obtenir des conseils supplémentaires.
How to store cobicistat
Gardez tous les médicaments hors de la portée et de la vue des enfants.
Store the tablets in the original container in a cool, dry place, away from direct heat and light.
Informations importantes sur tous les médicaments
Informations importantes sur tous les 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 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 the primary role of cobicistat in HIV treatment?
Cobicistat is a pharmacokinetic enhancer. It doesn't directly fight the HIV virus itself. Instead, it boosts the effect of other HIV medicines, specifically atazanavir or darunavir, by slowing down how quickly your body breaks them down. This means more of the atazanavir or darunavir stays in your system for longer, making them more effective in treating HIV.
Can children take cobicistat?
Yes, cobicistat can be used in children, but only those aged 12 years or older.
Why is cobicistat always prescribed with other HIV medicines?
Cobicistat is prescribed as part of a combination therapy for HIV. It is specifically designed to be taken with either atazanavir or darunavir to boost their effectiveness. Antiretroviral treatment for HIV typically involves three or more medicines because this approach is more effective and helps prevent the virus from becoming resistant to a single medicine.
Why might my doctor switch my HIV treatment if I become pregnant while taking cobicistat?
If you become pregnant while taking cobicistat, it's important to tell your doctor right away. Your doctor might recommend a different combination of treatments because some regimens may be more effective or safer during pregnancy for both you and your baby.
What should I do if I feel depressed or have self-harming thoughts while on cobicistat?
It's not uncommon for people with HIV to experience feelings of depression, especially after diagnosis or starting treatment. If you have any distressing thoughts about harming yourself, or if you feel low or depressed, you should speak with your doctor straightaway for support and advice.
Are there any specific foods I should avoid while taking cobicistat?
While taking cobicistat, if you experience side-effects like feeling sick (nausea), being sick (vomiting), diarrhoea, stomach pain, indigestion, or wind, it is recommended to stick to simple meals and avoid fatty or spicy foods to help manage these symptoms.
How should I store cobicistat tablets?
Cobicistat tablets should be stored in their original container in a cool, dry place, away from direct heat and light. Always keep all medicines out of the reach and sight of children.
Lectures complémentaires et références
- Manufacturer's PIL, Tybost® 150 mg film-coated tablets; Gilead Sciences Ltd, The electronic Medicines Compendium. Dated October 2021.
- 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: 19 Jan 2027
20 juil. 2022 | Dernière version

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