Tabletas de Norfloxacino para infecciones
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 9 de mayo de 2023
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Clinical author's note Michael Stewart 30/04/2020:At the time of review there are no branded or generic products containing norfloxacin available in the UK. Norfloxacin may still be available in other countries. This medicine leaflet is based on medical information available in the UK at the time of writing and is left here for reference purposes. Please also refer to the manufacturer's information supplied with your medicine.
Norfloxacin is given to treat urine infections.
It is important to complete the full course of treatment. This is to prevent the infection from coming back.
The most common side-effects are feeling sick (nausea), diarrhoea, feeling dizzy and headache.
Norfloxacin may impair your alertness, so make sure your reactions are normal before you drive and before you use tools or machines.
De un vistazo
Norfloxacin is an antibiotic used to treat urinary tract infections like cystitis.
Funciona matando las bacterias que causan la infección.
Take norfloxacin on an empty stomach, either one hour before food or two hours after.
Avoid milk, indigestion remedies, or medicines with iron or zinc for two hours around your dose.
Finish the entire course of tablets, even if you feel better.
It can cause side effects like feeling sick, indigestion, headache, or dizziness.
About norfloxacin
Tipo de medicamento | A quinolone antibiotic |
Usado para | Treatment of urinary tract infections |
Disponible como | Tablets (discontinued) |
Norfloxacin is given to treat urinary tract infections, such as cistitis y chronic prostatitis. It works by killing the bacteria which are the cause of the infection.
Before taking norfloxacin
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking norfloxacin it is important that your doctor knows:
Si estás embarazada, intentando concebir o amamantando.
Si tienes menos de 18 años de edad.
If you have ever experienced a problem with your tendons after taking another quinolone antibiotic (these are called ofloxacin, levofloxacin, ciprofloxacin, moxifloxacin, and nalidixic acid).
Si tienes algún problema con el funcionamiento de tus riñones.
If you have epilepsy or any other condition that causes fits.
If you have a heart condition, or if you have been told you have an unusual heartbeat.
If you have a condition causing tired and weak muscles, called myasthenia gravis.
If you know you have glucose 6-phosphate dehydrogenase (G6PD) deficiency. This is a genetic disorder which causes problems after eating foods such as fava beans.
Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
Si alguna vez has tenido una reacción alérgica a un medicamento.
How to take norfloxacin
Before you start taking the tablets, read the manufacturer's printed information leaflet from inside the pack. The manufacturer's leaflet will give you more information about norfloxacin and a full list of the side-effects which you may experience from taking it.
Take norfloxacin exactly as your doctor tells you to. The usual dose is one 400 mg tablet, taken twice a day. Swallow the tablet with a drink of water.
You should take the tablets when your stomach is empty, which means taking them one hour before any food, or waiting until two hours afterwards. This is because your body absorbs less norfloxacin after a meal, which means the medicine is less effective.
Try to space out the doses over the day - so ideally, take a dose every 12 hours.
Do not drink milk or take indigestion remedies or medicines containing iron or zinc (such as multivitamin tablets) during the two hours before you take norfloxacin, or during the two hours after you have taken a dose. This is because these things interfere with the way norfloxacin is absorbed by your body, and stop it from working fully.
If you forget to take a dose, take it as soon as you remember unless your next dose is due. If your next dose is due then take the dose which is due but leave out the forgotten one. Do not take two tablets together to make up for a missed dose.
Even if you feel your infection has cleared up, keep taking the antibiotic until the course is finished (unless you are told to stop by your doctor). This is to prevent the infection from coming back. A course of treatment usually lasts for 7-10 days, although it may be for a shorter time than this if you are a woman. If you have a long-term (chronic) infection, your course of treatment will be for longer than this, possibly for 1-3 months. If you still feel unwell after finishing the course of tablets, go back to see your doctor.
Obteniendo el máximo de tu tratamiento
Remember to keep any routine appointments with your doctor. This is so your progress can be monitored.
Norfloxacin may cause your skin to become more sensitive to sunlight than normal. Protect your skin by using a sunscreen, particularly if you are exposed to strong sunlight for a prolonged period of time. Do not use sunbeds.
If you buy any medicines check with a pharmacist that they are safe to take with this antibiotic. In particular, do not take painkillers called non-steroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen, while you are taking norfloxacin.
Some people develop thrush (redness and itching in the mouth or vagina) after taking a course of antibiotics. If you think you have thrush, speak with your doctor or pharmacist for advice.
Este antibiótico puede impedir que la vacuna oral contra la fiebre tifoidea funcione. Si está recibiendo alguna vacunación, asegúrese de que la persona que lo atiende sepa que está tomando este medicamento.
Norfloxacin may make you feel light-headed and impair your ability to concentrate. Make sure your reactions are normal before you drive, operate machinery or do any other jobs which could be dangerous if you are not sufficiently alert.
Can norfloxacin cause problems?
Along with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the most common ones associated with norfloxacin. 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 of the following continue or become troublesome.
Común norfloxacin side-effects | ¿Qué puedo hacer si experimento esto? |
Sentirse enfermo (náuseas) o estar enfermo (vómitos), indigestión, dolor de estómago (abdominal) | Mantente en alimentos simples - evita comidas ricas o picantes |
Diarrea | Drink plenty of water to replace lost fluids. If the diarrhoea is severe or continues to be a problem, speak with your pharmacist or doctor for advice |
Dolor de cabeza | Bebe mucha agua y pide a tu farmacéutico que te recomiende un analgésico adecuado. Si los dolores de cabeza continúan, informa a tu médico |
Sensación de mareo | Do not drive and do not use tools or machines until you feel well again |
Erupción | If this is severe, let your doctor know |
Importante: there are also a number of less common but more serious side-effects which have been associated with norfloxacin. Speak with your doctor as soon as possible if you experience the following:
An allergic-type reaction, such as swelling around your face or mouth, a skin rash, or any difficulty breathing.
Pain or swelling in your joints.
Problems with your vision or with your eyes.
If you experience any other symptoms which you think may be due to the tablets, speak with your doctor or pharmacist for advice.
How to store norfloxacin
Mantenga todos los medicamentos fuera del alcance y la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
Si vas a someterte a una operación o a un tratamiento dental, informa a la persona que realiza el tratamiento sobre los medicamentos que estás tomando.
No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos por ti.
Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.
Informar efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
What is norfloxacin 400mg used for?
Norfloxacin 400mg is prescribed to treat urinary tract infections, such as cystitis and chronic prostatitis. It works by eradicating the bacteria responsible for these infections.
Are there any specific medical conditions that would prevent me from taking norfloxacin?
Yes, several conditions might make norfloxacin unsuitable or require extra caution. These include being pregnant or breastfeeding, being under 18, having a history of tendon problems with other quinolone antibiotics, kidney problems, epilepsy or other seizure conditions, certain heart conditions, myasthenia gravis, or glucose 6-phosphate dehydrogenase (G6PD) deficiency. It's important to discuss any existing medical conditions with your doctor before starting this medication.
What should I do if I forget a dose of norfloxacin?
If you forget to take a dose, take it as soon as you remember. However, if it's nearly time for your next dose, skip the missed one and continue with your regular schedule. Do not take two tablets at once to make up for a forgotten dose.
How long will I need to take norfloxacin?
The duration of treatment varies. For most infections, a course typically lasts 7-10 days. However, women might have a shorter course. If you have a long-term (chronic) infection, your treatment could extend for 1-3 months. Always complete the full course as prescribed by your doctor, even if you feel better.
Can norfloxacin interact with other medications or supplements?
Yes, norfloxacin can interact with other substances. You should avoid drinking milk or taking indigestion remedies, or medicines containing iron or zinc (including some multivitamins), within two hours before or after taking norfloxacin, as these can interfere with its absorption. Also, inform your doctor or pharmacist about any other medicines, including over-the-counter, herbal, or complementary remedies, to ensure they are safe to take with this antibiotic. In particular, non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen should not be taken with norfloxacin.
Lecturas adicionales y referencias
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

Michael Stewart, MRPharmS
Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico
BPharm (Hons), MRPharmS
Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.
Acerca del revisor

Sid Dajani
Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 4 de noviembre de 2027
9 de mayo de 2023 | Última versión

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