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Tamiflu information
Like all medicines, this medicine can cause side effects, although not everybody gets them. Many of the side effects listed below may also be caused by influenza. The following serious side effects have been rarely reported since oseltamivir has been marketed:
- Anaphylactic and anaphylactoid reactions: severe allergic reactions, with face and skin swelling, itchy rashes, low blood pressure and breathing difficulties.
- Hepatic disorders (fulminant hepatitis, hepatic function disorder and jaundice): yellowing of the skin and whites of the eyes, change in stool colour, and changes in behaviour.
- Angioneurotic oedema: sudden onset of severe swelling of the skin, mainly around the head and neck area (including eyes and tongue), with difficulties breathing.
- Stevens–Johnson syndrome and toxic epidermal necrolysis: complicated, possibly life-threatening allergic reactions causing severe inflammation of the outer and possibly inner skin, initially with fever, sore throat and fatigue, followed by rashes, blisters, peeling and shedding of skin, possible breathing difficulties and low blood pressure.
- Gastrointestinal bleeding: prolonged bleeding from the large bowel or spitting up blood.
- Neuropsychiatric disorders: behavioural changes or abnormal mental states have been reported, mainly in children and adolescents.
Flu vaccination by injection is available to protect adults at risk of flu and its complications. It’s not 100% guaranteed to stop all flu viruses and the level of protection may vary between people, however, if you do get flu after vaccination it’s likely to be milder and not last as long than it would otherwise have been.
Always read the patient information leaflet before commencing treatment.
View patient information leaflet.Tamiflu is an anti-viral medication used to treat or prevent flu (the influenza virus). Tamiflu is currently the only licensed medication that has been clinically proven to reduce the duration of a flu outbreak.
Tamiflu has been clinically proven to reduce the duration of flu by up to 30% compared to people who don’t take Tamiflu in the first 48 hours. You should take Tamiflu as soon as possible for the maximum effect.
Tamiflu belongs to a group of medicines known as neuraminidase inhibitors. Tamiflu blocks the effects of a chemical called neuraminidase that is created by the influenza virus. As the flu virus needs neuraminidase to spread in the airways. By blocking the effects of neuraminidase, Tamiflu reduces the spread of the influenza virus in the airways. This makes it easier for the body’s immune system to clear up the infection.
Tamiflu can be taken to treat a current outbreak of flu if you start taking within 48 hours of flu symptoms appearing. Alternatively Tamiflu can be taken to prevent the flu if you have been in contact with someone with the flu or for up to six weeks as seasonal protection.
- To treat a current outbreak: The recommended oral dose is one tablet of Tamiflu (75mg) twice daily for 5 days.
- To prevent catching the flu from someone who is infected: The recommended dose for prevention of influenza following close contact with an infected individual is one tablet (75mg) daily for 10 days.
- Seasonal Protection: The recommended dose for prevention of influenza during a community outbreak is Tamiflu (75mg) once daily for up to 6 weeks.
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Dr. Bryony Henderson
Dr. Bryony Henderson is Medical Director for MedExpress UK, bringing extensive experience in clinical operations, governance and digital health. She has previously held roles dedicated to delivering safe, scalable care across well-known brands. She is a recognised clinical voice contributing to award-winning campaigns, publishing on health inequalities, and appearing across national media. Here, Bryony leads clinical governance and quality, supporting the delivery of safe, innovative and accessible healthcare.
Adedayo Titiloye
Adedayo Titiloye is Superintendent Pharmacist responsible for the safe and compliant delivery of pharmacy services across MedExpress. He brings experience across community pharmacy and regional operations, including leadership roles within one of the UK’s largest independent pharmacy groups. Here, Ade focuses on building high-performing teams, improving processes and ensuring pharmacy services deliver safe, effective care at scale.
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Dr. Kavir Matharu is a GP Lead at MedExpress, with 10 years’ experience across a range of healthcare settings. She is a practising GP with a background in complex healthcare consulting, having worked on high-level strategic and operational challenges within the health system. She was also selected for a leadership fellowship with the National Medical Director at NHS England. Kavir has a strong interest in healthcare leadership and system improvement, with a focus on high-quality, sustainable care.
Dr. Daryl Perera
Dr. Daryl Perera is a GP Lead at MedExpress, with experience across NHS primary care, urgent care and private practice. He has extensive experience in digital healthcare and clinical leadership, and oversees clinical governance and patient safety across our digital health services. His work spans urgent care and preventative medicine, with particular interests in men’s health, obesity management, and sport and exercise medicine. Daryl has worked across a range of NHS and private healthcare organisations and previously held a GP Director role.
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BSc (Hons), MSc, PhD
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Dr. Zoe Lees is a Medical Writer at MedExpress, specialising in clear, evidence-based health communications. She completed her postgraduate research at the University of Glasgow, focusing on metabolic complications of pregnancy and the role of adipose tissue function. Zoe brings a strong scientific foundation to her work and is committed to delivering content that is both accurate and accessible, grounded in robust research.
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Liyya Patel
Liyya Patel is Deputy Chief Pharmacist at MedExpress UK, with over 10 years’ experience supporting the organisation’s growth and development. She is responsible for ensuring pharmacy services are safe, compliant and meet all regulatory standards, playing a key role in maintaining high-quality clinical care. Liyya previously worked in high-volume community pharmacy settings in Central London and is a qualified pharmacist and independent prescriber.
Dr. Olivia de Rougemont
Dr. Olivia de Rougemont is a GP Lead at MedExpress with over 12 years’ experience across the NHS and private sectors. She has extensive experience in digital and in-person care, with a particular interest in women’s health, preventative medicine, and delivering patient-centred support that feels clear and accessible. Olivia also leads and mentors GPs, and brings a global perspective shaped by her experience working across different healthcare systems.