Antibiotics and urinary infections

Why antibiotics are prescription-only in Ireland

No antibiotic is available without a prescription in Ireland, and a pharmacist cannot supply one on request however convincing the symptoms sound. The reason is that choosing an antibiotic is a series of judgements: whether the infection is bacterial at all, which organism is likely, which drug reaches that site of the body, what your allergies and kidney function allow, what you are already taking, and whether you are pregnant.

Behind that sits the resistance problem. Every unnecessary course selects for bacteria that survive it, and the drugs that still work in serious infection are finite. Ireland has a national antimicrobial stewardship effort for exactly this reason, and it is one of the few areas where a prescriber saying no is the medically correct outcome rather than a failure of service. Leftover antibiotics from an old course are a separate hazard: the wrong drug, an incomplete quantity and an out-of-date judgement about an infection that has moved on.

When an antibiotic is needed and when it is not

Antibiotics kill bacteria and do nothing whatever to viruses. Colds, most sore throats, most coughs and bronchitis, flu, and most sinus congestion in the first week are viral, so an antibiotic changes neither the length nor the severity of the illness while still exposing you to its side effects. Green or yellow mucus is not evidence of a bacterial infection; it is what inflamed airways produce.

Bacterial infections that generally do need treatment include most urinary tract infections, bacterial pneumonia, cellulitis and other skin infections with spreading redness, dental abscess, and streptococcal throat infection where clinical scoring and sometimes a swab support it. The signals that push towards treatment are duration and direction: an illness that was improving and then got clearly worse, a fever that returns after settling, one-sided severe pain, spreading redness, or symptoms lasting well beyond the expected course. That assessment usually needs somebody who can look at you, which is the honest limit of any online service.

Urinary tract infections and what is used first

In an otherwise healthy non-pregnant woman with an uncomplicated lower urinary tract infection, short defined courses are the standard first-line approach, and nitrofurantoin is the usual first choice in Ireland. Trimethoprim and fosfomycin are alternatives depending on local resistance and on the individual. Ciprofloxacin and other fluoroquinolones are deliberately kept in reserve because of serious side effects including tendon injury, and are not a first-line treatment for simple cystitis.

Several situations are not uncomplicated and are treated differently: urinary infection in pregnancy, in men, in children, with a urinary catheter, with known kidney stones or abnormal anatomy, or a recurrent pattern with several episodes in a year. Nitrofurantoin is also avoided where kidney function is significantly reduced, which is why an accurate age and recent kidney result matter. Fever, shivering, back or flank pain, vomiting or confusion suggest the infection has reached the kidney, and that needs same-day medical assessment rather than a delayed decision.

Do I need to finish the course

Take the course as it was prescribed to you, and if you think you should stop early, ask the prescriber rather than deciding alone. The old absolute instruction to always finish every tablet has been reconsidered in recent years, because for some infections shorter courses work as well and reduce harm. What has not changed is that the length was chosen for your infection, so shortening it on your own initiative is guessing.

Two practical points matter more than the theory. Never save leftover tablets for the next time, and never take antibiotics prescribed for somebody else: the drug may be wrong for your infection, the quantity will be short, and you will be treating an illness nobody has assessed. And if you are not improving after two or three days of treatment, or you are getting worse at any point, go back to a doctor rather than finishing the box and hoping. Diarrhoea during or after a course is common; severe or persistent diarrhoea needs medical advice.

What if I am allergic to penicillin

Say so before anything is prescribed, and try to describe what actually happened. A great many people carry a penicillin allergy label from childhood that turns out not to be a true allergy, and the distinction changes treatment: nausea, diarrhoea or a headache is a side effect, whereas hives, facial or throat swelling, wheeze or collapse is an allergic reaction. A rash appearing several days into a course is common in viral illness and often gets recorded as allergy without being one.

The label matters because alternatives to penicillins are sometimes less effective, broader in spectrum or more likely to cause resistance and side effects. If your history is uncertain, a GP or allergy service can arrange proper assessment, which is worth doing once rather than working around a label for decades. In the meantime, alternatives such as doxycycline or a macrolide are chosen according to the infection. Anaphylaxis is an emergency: ring 112 or 999 and use an adrenaline auto-injector if one has been prescribed.

Antimicrobial resistance and why prescribers say no

Resistance is not an abstraction and it is not somebody else's problem in another country. Bacteria that survive an unnecessary course persist in your own gut and skin flora for months and are the ones that cause your next infection, which is why previous antibiotic exposure is one of the strongest predictors of a resistant organism. Multiply that across a population and the drugs that work in sepsis, in surgery and in cancer care start to fail.

That is the frame for a prescriber declining a request. A no is not an administrative obstacle to be routed around by asking a different service; it is a clinical judgement that the balance does not favour treatment. Repeated requests for antibiotics for recurrent symptoms are usually a signal that something else needs investigating, whether that is recurrent urinary infection needing a proper work-up, reflux masquerading as a chronic cough, or allergy behaving like sinusitis. Those answers take longer than a prescription and last a great deal longer too.

Why a new infection is not a repeat prescription

MEDINOW does not issue antibiotics for a new infection, and there is no way to buy one here. Our written repeat prescription assessment covers treatment you are already established on, where the substance, strength and dose are unchanged and the condition is stable. An infection is by definition a new episode: it needs assessment of this illness, often examination, sometimes a urine sample or a swab, and a fresh decision about whether an antibiotic is warranted at all. Having had the same antibiotic before for something that felt similar does not make the next course a renewal.

The right routes are your GP, the out-of-hours GP service, or an Irish service that can assess an acute illness. What our service can help with is the unrelated long-term medicine that is running low in the middle of all this. There is no video consultation, no phone appointment and no live chat, which is another reason an acute infection is the wrong fit for this model: acute illness needs someone who can see you and follow up.

When to seek urgent care

Some presentations do not wait for an appointment. Ring 112 or 999, or go to the nearest Emergency Department, for a rash that does not fade when pressed with a glass, a stiff neck with fever and dislike of light, confusion or unusual drowsiness in someone unwell, very fast breathing or breathlessness at rest, mottled or very pale skin, not passing urine all day, or a temperature that will not come down in someone who is getting worse rather than better.

Same-day assessment rather than an emergency ambulance is right for fever with back or flank pain and vomiting, spreading redness around a wound with fever, facial swelling from a dental infection, or urinary symptoms in pregnancy, in a man, or in a young child. Infection in someone whose immune system is suppressed by chemotherapy or immunosuppressant medicines is always treated as urgent, and those patients usually have a specific number to ring that overrides everything on this page.

Who wrote this page

This page was written by the MEDINOW editorial team and reviewed by lek. Damian Wojno, a doctor registered in Poland, PWZ no. 3211301. He is not on the Irish Medical Council register. Reviewed on 29 August 2026.

It is general information about how antibiotics are used in Ireland, not a diagnosis and not a recommendation to take any particular medicine. There is nothing to buy on this page. Full details of dosing, contraindications and interactions for any antibiotic are in its Summary of Product Characteristics.

How this page was put together: the medicines, categories and rules described here were checked against the sources listed below rather than written from memory, and any figure we could not verify at source was left out instead of estimated. Where Irish practice differs from the rules of another country, the Irish position is the one stated on this page, and the Irish regulators named here are the HPRA for medicines, the HSE for health services, the PSI for pharmacy and the Irish Medical Council for doctors practising in Ireland. Corrections are welcome by email and are made to the page rather than argued about.