Cefuroxime

Cefuroxime: taking it with food, the penicillin question & its limits

Cefuroxime is an antibiotic from the cephalosporin group and covers a broad spectrum of bacteria. In tablet form it is present as cefuroxime axetil — a precursor that only becomes active in the body, which is why it should be taken with or directly after a meal. Because absorption through the gut is only moderate even then, guidelines see cefuroxime as a second-line option for many straightforward infections.

See more detail

Get through the antibiotic course without a missed dose

A reminder at the right interval, a record of what you have taken and the end date in one place — free in the brite app.

Track your course

Contents

  1. At a Glance: Technical Data Sheet
  2. How it works: how cefuroxime stops bacteria
  3. Dosing: what the SmPC describes
  4. Taking it: why the tablet belongs with a meal
  5. Side effects: keeping an eye on diarrhoea
  6. Penicillin allergy: the old ten per cent rule
  7. Interactions: acid blockers, the pill, anticoagulants
  8. What it is used for and its limits: often only second line
  9. Milk and calcium: no need to worry here
  10. Finishing the course: resistance in everyday life
  11. Special situations: pregnancy, children, the kidneys
  12. Cefuroxime experiences: what patients really ask
  13. FAQ: Common questions about cefuroxime

1. At a Glance: Technical Data Sheet

PropertyDetails
Active ingredientCefuroxime; in tablets as cefuroxime axetil (a precursor that is only converted in the body)
ATC codeJ01DC02
Drug classBeta-lactam antibiotic, a second-generation cephalosporin
Dosage formsFilm-coated tablets (usually 250 mg and 500 mg), granules for an oral suspension for children; in hospital also as an infusion
Half-lifeAround 1 to 1.5 hours — which is why it is usually taken twice daily
Oral bioavailabilityOnly moderate and strongly dependent on food: markedly poorer on an empty stomach
Maximum daily dose (oral)According to the SmPC, in adults as a rule 1,000 mg a day split into two doses; the individual dose is set by the practice
Onset of effectEffective levels within hours; a noticeable improvement usually after 48 to 72 hours
Prescription statusPrescription-only medicine
Notable featureBelongs with a meal or directly after it — taking it on an empty stomach is the commonest mistake in use
Table scrolls to the right

2. How it works: how cefuroxime stops bacteria

Bacteria surround themselves with a sturdy cell wall. Like the penicillins, cefuroxime belongs to the family of beta-lactam antibiotics and blocks the enzymes that hold this cell wall together. The bacteria can no longer divide and die off — so cefuroxime is bactericidal.¹

As a second-generation cephalosporin, cefuroxime covers a broader spectrum than classic penicillin. That sounds like an advantage, but it has a downside: the more broadly an antibiotic works, the more it also attacks the harmless bacteria that live alongside in the gut. That explains the typical side effects (section 5) and the cautious assessment in many guidelines (section 8).

Why the tablet contains a different substance

Cefuroxime itself is barely absorbed from the gut. For the tablet, cefuroxime axetil is therefore used: a chemically packaged cefuroxime that can pass through the wall of the gut and is only split into the actual active substance inside the body. This packaging is the reason for almost every rule about taking it in this article — it needs stomach acid and a full stomach in order to arrive reliably.

3. Dosing: what the SmPC describes

The details below describe what the SmPC gives as the usual approach. They are not a dosing instruction: the amount and the duration depend on the type of infection, kidney function and age, and are set by the treating practice.

  • Twice daily: because of the short half-life, usually morning and evening, ideally about twelve hours apart.
  • Usual single amounts: in adults mostly 250 mg or 500 mg per dose, depending on the site of the infection.
  • Duration of treatment: depending on the indication typically five to ten days; with early Lyme disease considerably longer, usually two to three weeks.
  • Children: generally receive granules made up as a suspension, with the amount based on body weight.
  • Reduced kidney function: where the impairment is marked, the amount is adjusted or the interval is lengthened.
Try not to break the tablet up. Cefuroxime axetil tastes extremely bitter, and the film coating protects you from that. If swallowing is difficult, the suspension is the better solution — raise it at the pharmacy rather than crushing the tablet. See splitting tablets.

4. Taking it: why the tablet belongs with a meal

This is the most important section of this article. Many people reflexively take antibiotics "on an empty stomach". With cefuroxime axetil that is exactly the wrong way round: the precursor is absorbed considerably better when it meets a full stomach. On an empty stomach, noticeably less of the active substance reaches the blood — and with an antibiotic it is the blood level that decides whether the bacteria are killed off or merely survive in a weakened state. The SmPC therefore clearly specifies taking it after a meal.¹

  1. With a meal or directly after it. Breakfast and the evening meal are the obvious anchors. A yoghurt or a slice of bread is enough — it does not have to be a lavish dinner, but the stomach should not be empty.
  2. Swallow it with plenty of water, so that the tablet does not stay lodged in your gullet.
  3. Keep the interval. About twelve hours between doses keeps the level steady. "Morning and midday" is not an equivalent alternative.
  4. Acid blockers need a second look. Stomach acid helps release the active substance. If you take pantoprazole or omeprazole continuously, or swallow an antacid, you should discuss it with your practice or pharmacy (section 7).
  5. A missed dose: if you notice soon afterwards, it is generally taken late; if the next dose is already close, the missed one is usually left out. A double amount is not a solution — see missed a medication.
Everyday mistake number one. "Antibiotics are best taken on an empty stomach" is true for some drugs — for cefuroxime axetil it is not. Which medicine belongs when is set out in medications before or after eating; if you take several preparations, taking antibiotics correctly is worth a look.

Twelve hours apart — without having to think about it

Two reminders a day, tied to your mealtimes.

Set a reminder

5. Side effects: keeping an eye on diarrhoea

Cefuroxime is regarded as comparatively well tolerated. Most complaints affect the gastrointestinal tract and are a consequence of the fact that the antibiotic does not distinguish between the bacteria that make you ill and the useful ones.

Commoner and usually harmless

  • Diarrhoea and loose stools — very typical, often starting after two to three days and settling once the course ends.
  • Nausea and abdominal pain — taking it with food usually eases both noticeably.
  • Fungal overgrowth — oral thrush or vaginal thrush occur more often under broad-spectrum antibiotics.
  • Headaches and a feeling of grogginess — usually temporary.

Rarer, but important to know about

  • Allergic reactions: a skin rash and itching are the commonest forms; severe immediate reactions are rare, but possible.
  • Altered liver values: temporarily raised liver enzymes do occur and usually settle again — for context see understanding blood values.
  • A positive Coombs test: cephalosporins can distort laboratory tests used for blood group determination. So if a transfusion is planned, say that you are taking cefuroxime.
Watery diarrhoea with fever and cramps: get it assessed immediately. If the diarrhoea becomes severe or bloody during the course or up to several weeks afterwards, or comes with fever and severe abdominal cramps, an inflammation of the bowel caused by Clostridioides difficile may be behind it — cephalosporins are among the groups with an increased risk of this. Do not then take anti-diarrhoeal medicines such as loperamide on your own initiative; contact a doctor instead. With heavy fluid loss or a high fever this belongs in the emergency department.
Signs of a severe allergy. Weals over the whole body, swelling of the lips, tongue or throat, breathlessness or circulatory collapse make this an emergency — call 112 (emergency services in Germany). Against "ordinary" antibiotic diarrhoea, by contrast, patience, plenty of fluids and light food usually help; whether probiotics achieve anything is disputed (see gut health) — how to report side effects is set out under side effects of medications.

6. Penicillin allergy: the old ten per cent rule

Hardly any question comes up as often in the pharmacy: "I cannot tolerate penicillin — am I allowed to take cefuroxime at all?" The honest answer is: usually yes, but the decision belongs in medical hands.

For decades it was taught that around one in ten people with a penicillin allergy also reacts to cephalosporins. That figure comes from old studies using contaminated preparations and is regarded today as far too high; more recent analyses arrive at a considerably lower rate of cross-reactivity.² What matters is less the drug group than the chemical side chain — and on that point cefuroxime differs from amoxicillin and the classic penicillins.

Why this matters in practice. Many people have carried the entry "penicillin allergy" in their Allergiepass, the German allergy passport, since childhood without the reaction ever having been checked — frequently a virus-related rash during an infection was behind it. An entry like that leads to broader-acting reserve antibiotics being prescribed permanently, with more side effects and more pressure towards resistance. An allergy assessment can break this cycle.
  • Name the reaction, not just the label. "A rash on the third day" is something entirely different from "breathlessness 20 minutes after the first tablet".
  • With severe immediate reactions — circulatory collapse, breathlessness, swelling of the larynx — beta-lactams are avoided until an allergy service has clarified matters; with severe skin reactions such as Stevens-Johnson syndrome, any re-exposure is off the table.
  • Take your Allergiepass with you — to every medical appointment and to the pharmacy, see preparing for a doctor's appointment.

There are alternatives outside the beta-lactam family — azithromycin, doxycycline or ciprofloxacin, for instance. Each group brings drawbacks of its own, so a blanket reflex to switch is not automatically the safer choice.

7. Interactions: acid blockers, the pill, anticoagulants

Cefuroxime is barely metabolised by the liver and therefore has few classic interactions. The relevant points revolve around two questions: does enough of the active substance reach the blood, and what does the antibiotic do to the gut flora and the kidneys?

CombinationConsequenceWhat to do
Proton pump inhibitors such as pantoprazole, H2 blockers, antacidsLess stomach acid, and so less absorption of cefuroximeClarify the timing and the need for them with your practice or pharmacy
Vitamin K antagonists such as phenprocoumonThe INR can rise under antibioticsDiscuss closer INR checks during and after the course
Probenecid (a gout medicine)Cefuroxime is excreted more slowly and the level risesHave the combination checked by a doctor
Loop diuretics such as furosemide, aminoglycosidesAdditional strain on kidney function is possibleKeep an eye on the kidney values
Hormonal contraceptionNo relevant effect on breakdown; it only becomes critical with vomiting and severe diarrhoeaUse additional contraception if you have gastrointestinal complaints
AlcoholNo specific intolerance as there is with metronidazole, but more gastrointestinal complaintsBetter to go without during the course
Table scrolls to the right

The pill and the antibiotic: what applies today

The line "antibiotics make the pill ineffective" is a persistent one. On current knowledge it does not apply to the great majority of antibiotics — one relevant exception is rifampicin and related drugs, which massively speed up the breakdown of hormones in the liver. Cefuroxime is not among them.

What matters in practice is something else: anyone who vomits or has severe diarrhoea because of the infection or because of the antibiotic may no longer be absorbing the hormones of the pill completely. The same rules then apply as for a missed tablet — details in the guide medications and contraception.

If several long-term medicines are involved, a systematic look beforehand is worthwhile: drug interactions, and on the subject of alcohol medications and alcohol.

8. What it is used for and its limits: often only second line

Cefuroxime axetil is one of the most frequently prescribed oral antibiotics in Germany — and in many guidelines it is still not the first recommendation. That contradiction deserves an honest explanation.

Area of useThe role of cefuroximeCommon first choice
Tonsillitis caused by streptococciPossible, but usually a fallback optionPenicillin V
Sinusitis, middle ear infectionSecond line, where the first choice is not an optionAmoxicillin, if an antibiotic is needed at all
An acute worsening of chronic bronchitisOne of several options where a bacterial cause is suspectedFrequently amoxicillin; with bronchitis from a cold, usually no antibiotic at all
An uncomplicated urinary tract infectionA reserve option, expressly not preferredFosfomycin or nitrofurantoin³
Early Lyme disease with a spreading rashAn established alternative where doxycycline does not fitDoxycycline, or alternatively amoxicillin⁴
Uncomplicated skin and soft tissue infectionsPossible, depending on the suspected pathogenThe drug chosen according to the pathogen and the local findings
Table scrolls to the right

The reason is called bioavailability

Only part of the tablet you swallow reaches the blood — even when it is correctly taken with food. Compared with amoxicillin, which is absorbed very reliably, that is a real disadvantage: what is not absorbed presses on the normal flora in the large bowel without achieving anything at the site of the infection. Moderate absorption plus a broad spectrum — which is why professional bodies prefer narrower-spectrum drugs for straightforward infections.

That does not mean your prescription is wrong. Points in favour of cefuroxime include a documented intolerance of penicillin, a known pathogen spectrum, a sensitivity test result or previous treatments that did not work. Never stop or switch a prescribed antibiotic on your own initiative — ask about the reasoning instead. Independently of all that: cefuroxime does not work against viruses (see cold, flu or covid).

9. Milk and calcium: no need to worry here

"Antibiotics and dairy products do not go together" is one of those rules that gets passed on across the board. It is true — but only for one particular group.

  • Tetracyclines and quinolones are the ones affected: doxycycline and ciprofloxacin form poorly soluble compounds with calcium, magnesium and iron — here the intervals are decisive.
  • Cefuroxime is not affected by this: a milky coffee, a yoghurt or cheese on your bread are no problem — on the contrary, a meal is exactly what is wanted here.
  • Do watch out with mineral supplements: not because of cefuroxime, but because iron supplements and magnesium can collide with other medicines — see supplements and medications.
  • Grapefruit plays no role either, because cefuroxime is not broken down via the typical liver enzymes — see grapefruit and medications.

10. Finishing the course: resistance in everyday life

After two to three days most people feel considerably better. That is exactly when the pack often goes into the cupboard — "for next time". That is unhelpful in several ways at once.

  • The prescribed duration has a reason. It is matched to the site of the infection — a urinary tract infection needs different periods from Lyme disease. Stopping early may leave behind precisely the most resilient organisms.
  • Leftover packs do not belong in self-medication. Half an antibiotic course at the next cold will not work there anyway and only breeds resistance.
  • Shorter courses are nevertheless sometimes right. For several infections, research is moving towards shorter treatment times — but that is decided by the practice in advance, not by your gut feeling on day three.
  • Resistance arises in exactly these everyday situations. Background in the guide antibiotic resistance.⁵
Dispose of leftovers properly. Antibiotics left over do not belong in the toilet or in the medicine cabinet; dispose of them with your residual waste or at the pharmacy — see home pharmacy checklist and storing medications correctly.

11. Special situations: pregnancy, children, the kidneys

Pregnancy and breastfeeding: along with the penicillins, the cephalosporins are among the antibiotics with the broadest experience in pregnancy and are therefore preferred where treatment is needed.⁶ While breastfeeding they are also regarded as well compatible; the baby's stools may become softer. The decision is made by the treating practice — orientation is offered by medications during pregnancy.

Children: the suspension is dosed by body weight. The bitter taste is the commonest reason why a course is not seen through — giving it after a meal helps twice over, for absorption and for acceptance. Tips in the guide medications for children.

The kidneys and older age: cefuroxime is excreted predominantly unchanged via the kidneys; where function is impaired the amount is adjusted, otherwise the level rises. In older age, kidney function and the other medicines being taken are the decisive factors — see medications for kidney and liver disease, polypharmacy and medications in old age.

12. Cefuroxime experiences: what patients really ask

"The tablet makes me feel sick — should I rather take it on an empty stomach?"

No, that is the wrong direction: without a meal the nausea usually gets worse, and at the same time less of the active substance reaches the blood. A mild, not too fatty meal directly before you take it is better — porridge, a banana, bread with cream cheese. If the nausea persists or you vomit, ring your practice rather than quietly changing how you take it.

"I have had diarrhoea since yesterday. Stop or carry on?"

Mild, mushy stools without fever are common under cefuroxime and are generally no reason to stop — drink plenty, eat light food, wait it out. It looks different with watery diarrhoea several times a day, blood in the stool, fever or severe cramps. A medical assessment is then needed, even weeks after the course has ended. Anti-diarrhoeal medicines on your own initiative are not a good idea here.

"My Allergiepass says penicillin. The doctor prescribed cefuroxime anyway."

That happens frequently and is usually well founded, because the cross-reactivity is considerably lower than was once assumed. What matters is that the practice knows which reaction occurred back then — say so actively, even if you are not asked.

Check the antibiotic against your regular medication

The interaction check shows critical combinations before the course starts.

Check a combination

FAQ: Common questions about cefuroxime

Yes. Cefuroxime axetil is absorbed from the gut considerably better after a meal than on an empty stomach. With an antibiotic, the blood level reached is what decides whether the bacteria are reliably killed off. The SmPC therefore expressly specifies taking it after food — this is the commonest mistake in use.
The active substance reaches effective levels within a few hours, but most people only feel noticeably better after 48 to 72 hours. If there is no improvement at all after three days, or if things get worse, that needs a medical assessment — the pathogen may be insensitive to it, or there may be no bacterial infection at all.
Yes. The well-known milk rule applies to tetracyclines such as doxycycline and to quinolones, because these form poorly soluble compounds with calcium. Cefuroxime does not. Since the tablet belongs with a meal anyway, yoghurt, cheese or a milky coffee are unproblematic.
Mild diarrhoea is common and usually no reason to stop: drink plenty, eat light food, continue the course as prescribed. With watery diarrhoea several times a day, blood in the stool, fever or severe abdominal cramps, on the other hand, a medical assessment is needed, even weeks after the course. You should not take anti-diarrhoeal medicines on your own initiative in this situation.
Frequently yes, but that is decided by the practice treating you. The cross-reactivity of around ten per cent that used to be taught is regarded on current knowledge as far too high. What matters is which reaction occurred back then: a late skin rash is assessed differently from a severe immediate reaction with breathlessness or circulatory collapse. Name these details actively instead of only mentioning the entry in your Allergiepass.
On current knowledge, not directly. Relevant effects on the breakdown of hormonal contraceptives are known above all for rifampicin and related drugs, not for cephalosporins. It becomes critical if vomiting or severe diarrhoea occur — the absorption of the hormones can then be disturbed and the same rules apply as for a missed pill.

Sources

  1. Summary of Product Characteristics (SmPC) for cefuroxime axetil film-coated tablets (current version, available through the information system of the regulatory authorities). pharmnet-bund.de
  2. Gesundheitsinformation.de (IQWiG): Antibiotics — how they work, how they are used and their side effects. Accessed 2026 — German source. gesundheitsinformation.de
  3. German S3 guideline on the epidemiology, diagnosis, treatment, prevention and management of uncomplicated bacterial community-acquired urinary tract infections (AWMF reg. no. 043-044, current version) — German source. awmf.org
  4. German S2k guideline on cutaneous Lyme borreliosis (German Dermatological Society, AWMF reg. no. 013-044, current version) — German source. awmf.org
  5. Robert Koch Institute (Germany's national public health institute): antibiotic resistance and antibiotic stewardship. Accessed 2026. rki.de
  6. Embryotox, Charité — German pharmacovigilance and advisory centre: cefuroxime in pregnancy and breastfeeding. Accessed 2026. embryotox.de

See the antibiotic course cleanly through — with brite

Reminders at mealtimes, the end of the course in view and an interaction check included. Free.

Create medication plan
brite App
Medical disclaimer: This article is for general information and does not replace medical or pharmacy advice, diagnosis or treatment. Do not stop a course of antibiotics on your own initiative and do not use leftover packs from earlier treatments. If you have watery or bloody diarrhoea with fever, or signs of an allergic reaction — weals, swelling of the lips, tongue or throat, breathlessness — seek medical help without delay or, in an emergency, call 112 (emergency services in Germany). The choice of medicine and the dose are always set individually by the treating practice. Last updated: August 2026.