The fatigue outlasts the sore throat by months, and that is the part nobody warns you about.
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Glandular fever is caused by the Epstein-Barr virus. Most people catch it in childhood without noticing — it produces little more than a mild sore throat — and by adulthood the great majority of us carry it. When infection is delayed until the teens or twenties, it produces the full illness: severe sore throat, fever, enormous glands and a fatigue quite unlike an ordinary virus.
Three things this page exists to say.
1. Do not take amoxicillin or ampicillin. Given to someone with glandular fever, these antibiotics cause a widespread itchy rash in the great majority of cases. It is not a penicillin allergy — but it is very often recorded as one, and people carry an incorrect penicillin allergy label for the rest of their lives as a result, which narrows their treatment options every time they are ill. If you have had this, it is worth having reviewed.
2. Avoid contact sport and heavy lifting for at least four weeks. The spleen enlarges and becomes fragile, and rupture — while uncommon — is a life-threatening emergency. This is the one genuinely dangerous complication, and it is the instruction most often forgotten once the sore throat settles.
3. The fatigue lasts longer than anyone tells you. The sore throat clears in a week or two; feeling properly well again commonly takes one to three months, and for a minority considerably longer. That is normal and expected — knowing it in advance prevents a great deal of worry about why you are not recovering "on schedule".
A widespread, itchy, blotchy rash appearing several days after starting amoxicillin or ampicillin — this happens in the great majority of people with glandular fever who are given these antibiotics, and it is close to diagnostic of the condition. It is not an allergic reaction, and it does not mean you are allergic to penicillin.
Epstein-Barr virus, one of the herpes family. Once you have it, it stays in the body permanently in a dormant state — which is why you cannot catch glandular fever twice, and why occasional harmless reactivation happens without any illness.
The incubation period is long — four to six weeks — which is why nobody can usually identify who they caught it from.
Worth knowing, because it saves unnecessary anxiety: the virus continues to be shed in saliva for months after recovery, and intermittently for life. Given that most adults already carry it, avoiding people is neither practical nor useful. Sensible measures — not sharing drinks or utensils, avoiding kissing while unwell — are enough. There is no need to stay off work or school beyond feeling well enough to go.
The picture is often recognisable from the history, and the blood tests are straightforward — which makes this well suited to a remote consultation, with a same-day blood form where needed.
We cannot examine your throat or feel your spleen. Difficulty breathing or swallowing saliva, severe abdominal pain, or inability to take fluids needs assessing in person the same day, and we will say so rather than arranging a blood test for someone who needs a hospital.
Aciclovir does not change the course of the illness. Antibiotics do nothing for a virus. What treatment there is aims at symptoms, at avoiding the dangerous complication, and at setting realistic expectations for recovery.
Amoxicillin and ampicillin cause a widespread rash in the great majority of people with glandular fever. If a throat infection needs antibiotics while glandular fever is possible, penicillin V or a macrolide is used instead.
And the part that matters years later: that rash is not a penicillin allergy. It is a specific interaction between those antibiotics and this virus. Being labelled penicillin-allergic on the strength of it narrows your options for life — leading to broader, less effective, more expensive antibiotics whenever you are ill. If this happened to you, we can review the record and correct it.
No contact sport, no collision sport, no heavy lifting and no vigorous exercise for at least four weeks from the start of the illness — and longer for rugby, martial arts, boxing and similar, where four to eight weeks is usual and a clinical review is sensible before returning.
The spleen enlarges and becomes fragile. Rupture is uncommon but life-threatening, and it can happen with surprisingly minor impact. Gentle walking is fine throughout.
Only for a genuine complication — airway obstruction from massive tonsillar swelling, or severe blood-count effects. Steroids are not used for ordinary glandular fever, do not speed recovery, and are not something to request.
The most useful advice we give:
If you are no better at three months, we reassess rather than simply attributing it to the virus — checking thyroid function, ferritin, B12, vitamin D, coeliac serology and blood sugar. Where post-viral fatigue is settling in, pacing rather than pushing is the approach, and where post-exertional malaise is prominent we consider ME/CFS and manage it accordingly — see our fatigue page.
We can provide a sick note, and a letter for a school, university or employer explaining the expected recovery time and any exercise restriction. Students in particular are often expected back at full pace far too soon, and a letter setting out realistic timescales is genuinely useful.
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Avoid it while your liver tests are abnormal — usually around four weeks, longer if the tests were markedly deranged. Most people with glandular fever have some liver inflammation, whether or not they were told.
If you developed a rash after amoxicillin during glandular fever and have been recorded as penicillin-allergic ever since, that label is very probably wrong, and it costs you something every time you need an antibiotic. It is worth reviewing properly.
Glandular fever has no specific treatment, and knowing that saves money. It is viral, it resolves on its own, and rest, fluids and simple painkillers are the management. Your NHS GP tests and assesses it free.
The single most important thing is free and clinical: do not take amoxicillin or ampicillin. Given during glandular fever they produce a florid widespread rash in the large majority of people — which is not a true penicillin allergy, but is frequently recorded as one and then follows someone for the rest of their life, pushing them onto broader antibiotics unnecessarily.
That is a genuine and lasting harm from a single avoidable prescription, and it is why a sore throat with marked fatigue and swollen glands in a young adult should raise glandular fever before an antibiotic is issued.
The second thing is also free and is about the spleen. Avoid contact sport, heavy lifting and vigorous exercise for at least four weeks — the spleen enlarges and can rupture, which is rare but serious. That advice is regularly not given.
Where a consultation is genuinely useful is arranging the blood tests — a full blood count, monospot or EBV serology, and liver function, which is commonly abnormal — and setting realistic expectations. Fatigue commonly lasts weeks to months, and knowing that prevents a great deal of worry.
Difficulty breathing or swallowing saliva, or severe abdominal pain, needs emergency assessment.
NICE Clinical Knowledge Summary, Glandular fever (infectious mononucleosis), is the principal reference. It recommends supportive management — rest, fluids and analgesia — and notes there is no specific antiviral treatment.
CKS is explicit that amoxicillin and ampicillin should be avoided, since they cause a widespread maculopapular rash in most people with acute EBV infection — the basis for the point above.
CKS advises avoiding contact sports and heavy lifting for at least four weeks because of the risk of splenic rupture, and longer where splenomegaly persists.
CKS covers investigation — full blood count with atypical lymphocytes, heterophile antibody (monospot) testing, and EBV-specific serology where the monospot is negative but suspicion remains.
CKS notes that fatigue may persist for weeks to months, and covers the complications requiring urgent assessment including airway compromise and splenic rupture.
The sore throat and fever usually settle within one to two weeks, and swollen glands over several weeks. The fatigue is the long part — commonly one to three months before you feel properly yourself, and longer for some people. Recovery is stop-start rather than steady: a good day followed by a poor one is the normal shape of it, not a relapse.
Because your spleen is enlarged and fragile. Splenic rupture is uncommon but life-threatening, and it can follow a surprisingly minor impact. Four weeks minimum from the start of the illness for contact sport, and four to eight for rugby, martial arts and similar, with a review before you return. Walking and gentle activity are fine throughout — it is impact and straining that matter.
Almost certainly not, and this is worth sorting out. Amoxicillin and ampicillin cause a widespread rash in the great majority of people who have glandular fever — it is a specific interaction with the virus, not an allergy. Being labelled penicillin-allergic on that basis follows you for life and means broader, less effective antibiotics every time you are ill. Bring it to us and we will review the record.
Quite possible. The monospot test is frequently falsely negative in the first week of the illness, and is unreliable in young children. If it was done early, it should be repeated — or EBV-specific antibodies requested instead, which are more accurate and can distinguish current from past infection.
Usually not. Mildly abnormal liver tests occur in most people with glandular fever — the virus causes a mild hepatitis — and they almost always return to normal. It is worth avoiding alcohol for about four weeks and repeating the test to confirm they settle. Reported without explanation, this result frightens people unnecessarily.
No. Once you have had EBV, it stays dormant in your body and you are immune to further attacks. If you get another glandular-fever-like illness, it is something else — cytomegalovirus, toxoplasmosis, streptococcal infection, or occasionally acute HIV, which produces a very similar picture and is worth testing for.
Only until you feel well enough to go. There is no formal exclusion period, and isolating serves no purpose: the virus is shed in saliva for months afterwards and most adults already carry it. Avoid sharing drinks and cutlery, and avoid kissing while you are unwell. Sport is the exception — that restriction is real.
For most people, no — recovery is complete. Around one in ten has fatigue lasting six months or more, and glandular fever is one of the most clearly established triggers for ME/CFS. The best protection is not pushing through: increase activity in small steps and hold each one, rather than doing everything on a good day. If you are no better at three months, come back — that warrants reassessment, not just more waiting.
No — no antiviral, antibiotic or supplement shortens glandular fever, and steroids are used only for genuine complications like airway swelling. Fluids, rest, regular pain relief and a gradual return to activity are the whole of it. Products sold for "EBV support" are selling to a market of exhausted people, not to evidence.
August 23, 2026
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