Oseltamivir capsules and suspension
Tamiflu, Ebilfumin
Revisione paritaria di Sid DajaniUltimo aggiornamento di Michael Stewart, MRPharmSUltimo aggiornamento 19 Gen 2025
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Oseltamivir is used for influenza virus A and B infections.
Follow the dosing instructions carefully and remember to complete the course.
You can help prevent the virus from spreading to others by using clean tissues to cover your mouth and nose when you cough or sneeze, and by washing your hands regularly.
Remember to keep warm, drink plenty of fluids and stay away from crowds.
At a glance
Oseltamivir (Tamiflu®) is an antiviral medicine used to treat and prevent flu.
It works by stopping the flu virus from spreading in your body, reducing symptoms and risks like pneumonia.
For treatment, start taking it within 48 hours of symptoms, twice daily for at least five days.
For prevention, take one dose daily for at least ten days, especially if exposed to flu.
Common side effects include feeling sick, headache, and cough.
Take doses after food to help reduce feeling sick.
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About oseltamivir
Tipo di medicinale | Un medicinale antivirale |
Utilizzato per | Treating or preventing flu (influenza) |
Chiamato anche | Tamiflu®; Ebilfumin® |
Disponibile come | Capsules and oral liquid medicine (suspension) |
Oseltamivir treats influenza (influenza) by preventing the viruses causing the infection from spreading once they are inside your body. This reduces the symptoms of the influenza infection. It also reduces the risk of other problems which can sometimes occur alongside flu, such as pneumonia. It is most effective when it is started within an hour or two of the first symptoms of infection, but it can still be effective after this time, as long as it is started within 48 hours of the first symptoms.
Oseltamivir is also used to prevent flu when there are high numbers of people with influenza in the community, such as in epidemics and pandemics. It is used for those who have been in close contact with people with flu and for those who would be at particular risk if they developed flu (such as young children, people with long-term medical conditions, and the elderly).
Oseltamivir is not a substitute for seasonal flu vaccination.
Before taking oseltamivir
Torna ai contenutiSome 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 oseltamivir it is important that your doctor knows:
If you are pregnant, trying for a baby or breastfeeding. Although you can take oseltamivir if you are expecting or feeding a baby, it is important that your doctor should know about this so that you can be made aware of the benefits and any risks of treatment.
If you have any problems with the way your kidneys work. This is because your dose may need adjusting.
Se stai assumendo o utilizzando altri medicinali. Questo include qualsiasi medicinale che stai assumendo e che è disponibile per l'acquisto senza prescrizione, così come i medicinali a base di erbe e complementari.
Se hai mai avuto una reazione allergica a un medicinale.
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How to take oseltamivir
Torna ai contenutiBefore you start the treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about oseltamivir and it will provide you with a full list of side-effects which you may experience from taking it.
Oseltamivir should be taken exactly as your doctor tells you to. This is particularly important if you are giving oseltamivir to your child, as the dose prescribed will depend upon the age of your child. Younger children are likely to be prescribed a liquid medicine. Follow the dosing instructions on the pack carefully.
Oseltamivir is a course of treatment. It is important that you finish the whole course (even if you do not feel unwell); otherwise the infection could return.
If you have been prescribed oseltamivir because you already have flu symptoms, you will need to take one dose twice each day for at least five days. Start taking it as soon as possible and space the doses evenly throughout the day. So, for example, take one dose in the morning and the other in the evening.
If you are taking oseltamivir because you have been in contact with someone with flu but do not have any symptoms yourself then you will be prescribed one dose a day for at least ten days. Start taking the capsules (or medicine) as soon as you collect your prescription, and from then on, take one dose a day, preferably in the morning with breakfast.
Swallow oseltamivir capsules with a drink of water. You can take your doses either before or after meals, although taking the doses after food can often reduce the risk of feelings of queasiness.
Se dimentichi di prendere una dose, prendila appena te ne ricordi (a meno che non sia quasi ora della dose successiva, in tal caso salta la dose dimenticata). Non prendere due dosi insieme per compensare una dose dimenticata.
How to measure the correct amount of oseltamivir liquid medicine
(Nota: your pharmacist will probably have prepared the medicine for you when you collect your prescription. If this has not been done and there is only powder in the bottle, you will need to add 55 ml of water. There is a measuring cup included in the pack, which has a line on it showing how much water to use. After you have added the water, shake the bottle well to mix the water with the powder. Then, push the bottle adapter into the neck of the bottle and replace the cap.)
Shake the bottle well and remove the cap.
Push down the plunger of the dispenser (oral syringe) as far as it will go (so that the plunger goes down to the tip).
Insert the tip of the dispenser into the adapter in the neck of the medicine bottle.
Turn the bottle with the dispenser attached, upside down.
Slowly pull out the plunger of the dispenser to fill it with medicine up to the mark which corresponds to the dose you need.
Turn the bottle with the dispenser attached, upright again.
Slowly remove the dispenser from the bottle.
Put the suspension directly into your (or your child's) mouth by pushing in the plunger of the dispenser. Swallow the medicine. You can eat or drink something after swallowing the medicine if you wish.
Take the dispenser apart and clean it by rinsing both parts under warm tap water.
Ottenere il massimo dal tuo trattamento
Torna ai contenutiThe dispenser in the pack of liquid medicine measures doses up to 10 ml. If you have been given oseltamivir to give to child under 1 year of age, your doctor will give you a smaller dispenser to use which measures up to 3 ml.
Try to help stop the spread of flu to others. You can do this by remembering to use clean tissues to cover your mouth and nose when you cough and sneeze, binning the tissues after use, and washing your hands regularly with soap and hot water.
Remember to keep warm, drink plenty of fluids and stay away from crowds. If your symptoms do not improve or if they get worse, phone your doctor for further advice.
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Can oseltamivir cause problems?
Torna ai contenutiAlong with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains the most common ones associated with oseltamivir. 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 continue or become troublesome.
Very common oseltamivir side-effects (these affect more than 1 in 10 people) | Cosa posso fare se sperimento questo? |
Sensazione di malessere (nausea) o vomito | This usually passes after the first day, but you may find it helpful to take your doses after a meal |
Mal di testa | Drink plenty of water and ask your pharmacist to recommend a suitable painkiller |
Cough, blocked nose (especially in children) | Ask your pharmacist to recommend a suitable remedy |
Common oseltamivir side-effects (these affect fewer than 1 in 10 people) | Cosa posso fare se sperimento questo? |
Flu-like symptoms, difficulty sleeping, tummy ache (abdominal pain), indigestion | Ask your pharmacist to recommend a suitable remedy |
Se si verificano altri sintomi che ritieni possano essere dovuti al medicinale, parla con il tuo medico o farmacista per ulteriori consigli.
How to store oseltamivir
Torna ai contenutiTenere tutti i medicinali fuori dalla portata e dalla vista dei bambini.
The oral liquid medicine can be stored for up to ten days after it has been made up. Do not use it after this time.
Conservare in un luogo fresco e asciutto, lontano da fonti di calore e luce diretta.
Informazioni importanti su tutti i medicinali
Torna ai contenutiInformazioni importanti su tutti i medicinali
Se devi sottoporti a un'operazione o a un trattamento dentale, informa la persona che esegue il trattamento quali medicinali stai assumendo.
Se acquisti dei medicinali, verifica con un farmacista che siano sicuri da assumere insieme agli altri tuoi medicinali.
Non assumere mai più della dose prescritta. Se sospetti che tu o qualcun altro possa aver assunto un sovradosaggio di questo medicinale, recati al pronto soccorso del tuo ospedale locale. Porta con te il contenitore, anche se è vuoto.
Questo medicinale è per te. Non darlo mai ad altre persone, anche se la loro condizione sembra essere la stessa della tua.
Non conservare medicinali scaduti o indesiderati. Portali alla tua farmacia locale che li smaltirà per te.
Se hai domande su questo medicinale, chiedi al tuo farmacista.
Segnala effetti collaterali di un medicinale o vaccino
Se si verificano effetti collaterali, è possibile segnalarli online tramite il Yellow Card website.

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Controlla le possibili interazioni tra farmaci, integratori e alimenti prima di assumerli insieme.
Domande frequenti
Can oseltamivir replace the flu vaccine?
No, oseltamivir is not a substitute for the seasonal flu vaccination. It is used to treat or prevent flu directly, but vaccination remains important for protection.
How quickly does oseltamivir start to work?
Oseltamivir is most effective when started within an hour or two of the first flu symptoms. However, it can still be effective if started within 48 hours of symptoms appearing.
Can oseltamivir be used for children of all ages?
Yes, oseltamivir can be prescribed for children. The dose will depend on the child's age, and younger children are likely to be given the liquid medicine. If giving to a child under 1 year old, a smaller dispenser for measuring up to 3 ml will be provided by your doctor.
What if I feel better before finishing the full course of oseltamivir?
It is important to finish the entire course of oseltamivir, even if you start to feel better. Stopping early could lead to the infection returning.
Are there any specific foods or drinks I should avoid while taking oseltamivir?
You can take oseltamivir doses either before or after meals. Taking the doses after food can often help reduce feelings of queasiness. There are no specific foods or drinks mentioned to avoid.
What should I do if my flu symptoms don't improve or get worse while taking oseltamivir?
If your symptoms do not improve or if they get worse while you are taking oseltamivir, you should contact your doctor for further advice.
How long can I store the liquid oseltamivir once it has been mixed?
Once the oral liquid medicine has been made up, it can be stored for up to ten days. Do not use it after this time.
Ulteriori letture e riferimenti
- Manufacturer's PIL, Tamiflu® 6 mg/ml powder for oral suspension; Roche Products Limited, The electronic Medicines Compendium. Dated February 2023.
- Manufacturer's PIL, Tamiflu® 75 mg hard capsules; Roche Products Limited, The electronic Medicines Compendium. Dated February 2023.
- Medicinali Completi BNF 89ª Edizione; Associazione Medica Britannica e Società Farmaceutica Reale di Gran Bretagna, Londra.
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About the authorView full bio

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

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.
Storia dell'articolo
Le informazioni su questa pagina sono scritte e revisionate da clinici qualificati.
Prossima revisione prevista: 19 Gen 2028
19 Gen 2025 | Ultima versione

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