Paxlovid comprimidos para la enfermedad de COVID-19
Revisado por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 19 Ene 2025
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Paxlovid® is a combination of two antiviral medicines. There are two different tablets to take for each dose; two pink tablets and one white tablet.
It is given to adults aged over 18 years when they have tested positive for COVID-19 and have at least one risk factor for developing severe illness.
Treatment should be started as soon as possible after diagnosis of COVID-19 disease and within the first five days of symptoms.
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About Paxlovid® tablets
Tipo de medicamento | Antiviral agent |
Utilizado para | Treatment of mild to moderate COVID-19 disease in adults over 18 years of age |
También llamado | Ritonavir and nirmatrelvir |
Disponible como | Tabletas |
Paxlovid® is a combination product containing two different tablets of antiviral medicines: ritonavir and nirmatrelvir. This medicine has been authorised in the UK under a conditional approval scheme and will be monitored closely.
Nirmatrelvir is active against the SARS-CoV-2 virus and prevents the virus from replicating. Ritonavir, although an antiviral medicine, is not active against SARS-CoV-2. Ritonavir is included in the treatment pack because it slows the breakdown of nirmatrelvir in the body and so leads to higher blood levels for longer. Taking ritonavir tablets at the same time is essential for the treatment to work.
Paxlovid® is used for adults aged over 18 who have tested positive for COVID-19 and have at least one risk factor for severe disease. Taking Paxlovid® as soon as possible once COVID-19 symptoms have started can lower your risk of being severely ill or needing hospital admission.
Clinical trials have shown that Paxlovid® may reduce the risk of needing hospital admission or dying from COVID-19 disease by up to 89%.
People at high risk of severe COVID-19 disease include those with medical conditions such as long-term heart, lung, liver, kidney or nerve problems, people with diabetes and people with weakened immune systems.
Before taking Paxlovid® tablets
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 Paxlovid® tablets it is important that your doctor knows:
Si está embarazada, esperando un bebé o en período de lactancia.
Si tiene algún problema con el funcionamiento del hígado o de los riñones.
If you are being treated for HIV infection.
If you are taking any other medicines. This is important as Paxlovid® affects the blood levels of many commonly used medicines. This includes medicines which are available to buy without a prescription, as well as some herbal and complementary medicines.
Si alguna vez ha tenido una reacción alérgica a un medicamento.
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How to take Paxlovid® tablets
Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The manufacturer’s leaflet will give you more information about Paxlovid® tablets and a full list of side-effects which you may experience from taking them.
Take Paxlovid® tablets exactly as your doctor tells you to. There are two differently coloured tablets. The pink tablets each contain 150 mg of nirmatrelvir. The white tablets each contain 100 mg of ritonavir.
One dose of Paxlovid® consists of two pink tablets and one white tablet taken together at the same time.
The tablets are presented in five 'daily dose cards' with enough tablets for each day of treatment.
Take one dose twice each day for five days. Space your doses evenly apart, every 12 hours.
Make sure you complete the full course of treatment even if you are feeling better.
Swallow the tablets whole with a drink of water. Do not break, chew or crush the tablets.
It is not important whether you take your doses before or after food.
If you forget to take a dose, take it as soon as you remember unless it has been more than eight hours since it was due. If it has been more than eight hours, leave out the forgotten dose and take your next dose when it is due. Do not take two doses together to make up for a missed one.
Aproveche al máximo su tratamiento
Treatment with Paxlovid® should be started as soon as possible after diagnosis of COVID-19 disease and within the first five days of symptoms.
Help your body fight the infection by drinking plenty of water, eating sensibly and getting lots of rest.
The best way to protect yourself against COVID-19 is through vaccination. Ensure your vaccinations are up to date in line with national guidance.
Paxlovid® can affect the metabolism of many commonly used medicines and could lead to you experiencing additional side-effects. Ask a pharmacist to check each of your prescribed medicines and advise you on any specific action to take. If you buy any medicines, check with a pharmacist that they are suitable for you to take with Paxlovid® tablets.
People taking certain medicines may need extra checks by their doctor to make sure their treatment hasn't been affected by taking Paxlovid®. Try to attend any blood tests or follow-up appointments that your doctor arranges.
There are limited data on the use of Paxlovid® during pregnancy. For this reason pregnant women should only be treated with Paxlovid® if there is a clear benefit. If there is a chance you could get pregnant, you should use effective contraception during treatment with Paxlovid®. Discuss with your doctor which types may be suitable for you.
Paxlovid® can reduce the effectiveness of combined hormonal contraceptives. Women using this type of contraception should use an additional barrier method of contraception during treatment with Paxlovid® and for one complete menstrual cycle afterwards.
There are limited data on the use of Paxlovid® when breastfeeding. Mothers who are breastfeeding should stop doing so during treatment with Paxlovid® and for 48 hours after your last dose.
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Can Paxlovid® 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 Paxlovid® tablets. 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.
Common Paxlovid® side-effects (affecting fewer than 1 in 10 people) | ¿Qué puedo hacer si me ocurre esto? |
Dolor de cabeza | Drink plenty of water and ask a pharmacist to recommend a suitable painkiller. |
Diarrhoea, being sick (vomiting) | Drink plenty of water to replace the fluids lost. Stick to simple meals - avoid rich or spicy foods |
An altered sense of taste or a metallic taste | This should pass after stopping treatment with Paxlovid®. Take frequent sips of water, try sucking sugar-free sweets |
Si experimenta cualquier otro síntoma que considere que puede deberse a este medicamento, consulte a su médico o farmacéutico.
How to store Paxlovid® tablets
Mantenga todos los medicamentos fuera del alcance y de la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
No tome nunca más de la dosis prescrita. Si sospecha que usted u otra persona ha tomado una sobredosis de este medicamento, acuda al servicio de urgencias de su hospital. Llévese el envase, aunque esté vacío.
Este medicamento es para usted. Nunca se lo dé a otras personas aunque su enfermedad parezca ser la misma que la suya.
If you are having an operation or dental treatment, tell the person carrying out the treatment that you are taking Paxlovid® tablets.
No guarde medicamentos caducados o que no desee. Llévelos a su farmacia local, que se encargará de eliminarlos por usted.
Si tiene cualquier duda sobre este medicamento pregunte a su farmacéutico.
Informar de los efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede notificarlos en línea a través del sitio web de la Tarjeta Amarilla.
Lecturas complementarias y referencias
- Manufacturer's PIL, Paxlovid® 150 mg/100 mg film-coated tablets; Pfizer Ltd, The electronic Medicines Compendium. Dated August 2024.
- Medicamentos BNF completa 89ª edición; Asociación Médica Británica y Real Sociedad Farmacéutica de Gran Bretaña, Londres.
Historia del artículo
La información de esta página ha sido redactada y revisada por médicos cualificados.
Fecha de la próxima revisión: 19 de enero de 2028
19 Ene 2025 | Última versión

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