Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Pharmacy Guide
Patient leaflets and SmPCs, drug interaction checker, official dosages and NHS pharmacy opening hours — all in one place.
Nitrofurantoin 100 mg Tablets
⚠ This medicine appears to have been discontinued
The electronic medicines compendium (emc) no longer publishes a Summary of Product Characteristics for this product, which usually means it is no longer marketed in the UK. The patient leaflet below is kept for reference, but the product may not be available.
If you were prescribed this medicine, other products containing Nitrofurantoin may still be available. Do not stop your treatment — ask your pharmacist or GP what to use instead.
What it is and what it is used for
for
Nitrofurantoin (the active substance in Nitrofurantoin Tablets) is an antibiotic. It is used to prevent and treat infections of the bladder, kidney and other parts of the urinary tract. You must talk to a doctor if you do not feel better or if you feel worse. 2.
What you need to know before you take it
e Nitrofurantoin Tablets
Do not take Nitrofurantoin Tablets:
- if you are allergic to Nitrofurantoin, other medicines containing nitrofurantoin or any of the other ingredients of this medicine (listed in Section 6)
- if you have a disease of the kidneys which is severely affecting the way they work (ask your doctor if you are not sure)
- if you are in the final stages of pregnancy (labour or delivery) as there is a risk that it might affect the baby
- if you have porphyria (blood disorder)
- if you are a patient with G6PD (glucose-6-phosphate dehydrogenase) deficiency
- if your child is under three months of age
- if you are breast-feeding a baby with suspected or known deficiency in an enzyme called G6PD (glucose-6-phosphate dehydrogenase). Tell your doctor if you are not sure about any of the above. Warnings and precautions Talk to your doctor, pharmacist or nurse before taking Nitrofurantoin Tablets:
- if you have diabetes
- if you are suffering from any illness causing severe weakness
- if you have anaemia (a decrease in red blood cells causing pale skin, weakness and breathlessness) or a lack of vitamin B or abnormal levels of salts in your blood (your doctor will
be able to advise you)
- if you have a history of allergic reactions
- if you have any problems with your kidneys.
- if you have disease of the lungs This medicine can also cause lung disease in patients with no previous medical history affecting their lungs. Lung disease can occur in patients on short-term or long-term treatment. Talk to your doctor if you experience trouble breathing, shortness of breath, a lingering cough, coughing up blood or mucus, or pain or discomfort when breathing. These may be symptoms of side effects affecting the lungs. The above conditions may increase the chance of developing a side effect which results in damage to the nerves, causes altered sense of feeling, pins and needles.
- if you lack an enzyme (body chemical) called glucose-6-phosphate dehydrogenase, which causes your red blood cells to be more easily damaged (this is more common in black people and people of Mediterranean, Middle Eastern or Asian origin. Your doctor will know)
- if you have any disease of the lungs, liver or nervous system. If you need to take Nitrofurantoin Tablets for a number of months, your doctor may want to regularly check how your lungs and liver are working
- as this medicine may interfere with urine tests for glucose, causing the test to give a "false positive" result. That is, the test may say that glucose is present in the urine even if it is not. This medicine may also cause your urine to turn yellow or brown.
- if you experience fatigue, yellowing of the skin or eyes, itching, skin rashes, joint pain, abdominal discomfort, nausea, vomiting, loss of appetite, dark urine, and pale or gray-colored stools. It may be symptoms of liver disorder. Other medicines and Nitrofurantoin Tablets Tell your doctor or pharmacist if you are taking, have recently taken or might take any other medicines. If they are taken with Nitrofurantoin Tablets their effect or the effect of Nitrofurantoin Tablets may be changed. In particular, tell your doctor or pharmacist if you are taking any of the following medicines:
- Antacids for indigestion (e.g. magnesium trisilicate)
- Medicines for gout (e.g. probenecid or sulfinpyrazone)
- Medicines which slow the passage of food through the stomach (e.g. atropine, hyoscine)
- Medicines for raised pressure in the eye (glaucoma), such as carbonic anhydrase inhibitors (e.g. acetazolamide)
- Medicines which make the urine less acidic (e.g. potassium citrate mixture)
- Medicines for infections, known as quinolones
- Typhoid vaccine, which is given for the prevention of typhoid. If you are in doubt about any of these medicines ask your doctor or pharmacist. Nitrofurantoin Tablets may interfere with the results of some tests for glucose in the urine. Nitrofurantoin Tablets with food and drink Nitrofurantoin Tablets should always be taken with food or milk. Taking this medicine with food or milk makes it work more effectively. This will help to avoid stomach upset and also to help the absorption. Pregnancy and breast-feeding If you are pregnant or breast-feeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before taking this medicine. As far as is known, Nitrofurantoin Tablets may be used in pregnancy. However, it should not be used during labour or delivery because there is a possibility that use at this stage may affect the
baby. If you want to breast-feed, please consult your doctor first. Driving and using machines Nitrofurantoin Tablets may cause dizziness and drowsiness. You should not drive or operate machinery if you are affected this way until such symptoms go away. Nitrofurantoin Tablets contain lactose This medicine contains lactose (sugars). If you have been told by your doctor that you have an intolerance to some sugars, contact your doctor before taking this medicine. 3.
How to take it
Nitrofurantoin Tablets
Always take this medicine exactly as your doctor or pharmacist has told you. Check with your doctor or pharmacist if you are not sure. The recommended dose is: Adults: The normal dosage depends on the type of infection you have and instructions should be written on the label provided by the pharmacist. Consult your pharmacist or doctor if these instructions are not clear. The usual doses are:
- For treatment of infections: Either one 50mg tablet or one 100mg tablet four times a day for seven days
- For prevention of further infections: Either one 50mg tablet or one 100mg tablet at bedtime
- For prevention of infections during surgery: One 50mg tablet four times a day on the day of the operation and three days thereafter. Use in children over three months of age: The dose depends on the weight of the child and will be provided by your doctor. Follow your doctor's instructions exactly. Children below 3 months of age should not take Nitrofurantoin Tablets Medical Checks Your doctor will watch carefully for any effects on the liver, lungs, blood or nervous system. Nitrofurantoin Tablets may interfere with the results of some tests for glucose in the urine. Method of administration Tablets should be swallowed whole. The score line is not intended for breaking the tablet. Nitrofurantoin Tablets should always be taken with food or milk. Taking this medicine with food or milk makes it work more effectively. If you take more Nitrofurantoin Tablets than you should Consult your doctor or pharmacist immediately or go to the emergency department of the nearest hospital. Always take any left-over tablets with you, as well as the container and label, so that the medical staff knows what you have taken. You may experience symptoms of stomach ache, nausea and vomiting. If you forget to take Nitrofurantoin Tablets Do not worry. If you remember later on that day, take that day's dose as usual. If you miss a whole day's dose take the normal dose on the next day. Do not take a double dose to make up for a forgotten dose. If you are not sure ask your doctor or pharmacist. If you stop taking Nitrofurantoin Tablets Your doctor will tell you how long to take the treatment. Do not stop earlier than you are told, even if you feel better. If you have any further questions on the use of this medicine, ask your doctor, pharmacist or nurse.
4.
Possible side effects
Like all medicines, this medicine can cause side effects, although not everybody gets them. Most of them are mild and disappear when you stop taking Nitrofurantoin Tablets. All medicines can cause allergic reactions although serious allergic reactions are rare. If you notice any sudden wheeziness, difficulty in breathing, swelling of the eyelids, face or lips, rash or itching (especially affecting your whole body) STOP TAKING your medicine and go to a doctor immediately. If you experience any of the side effects detailed below, stop taking Nitrofurantoin Tablets and consult your doctor. •Your lungs may react to Nitrofurantoin Tablets. This can happen quickly, within one week after the start of treatment, or very slowly, especially in the elderly and can lead to fever, chills, cough and shortness of breath associated with pneumonia. Scaring due to damage lung tissue may occur.
- Jaundice (inflammation of the liver causing yellowing of the skin or whites of the eyes)
- The nerves outside the spinal cord may be affected causing changes to the sense of feeling and the use of muscles. In addition headache, extreme changes of mood or mental state, confusion, weakness, involuntary eye movement (which may cause the eye to rapidly move from side to side, up and down or in a circle, and slightly blur vision) may occur. These effects may be severe and in some instances permanent
- Raised pressure in the skull (causing severe headaches)
- Severe reduction in blood cells which can cause weakness, bruising or make infections more likely
- Blue or purple coloration of the skin due to low oxygen levels. A condition known as cyanosis
- Symptoms of fever, flu, abdominal pain, diarrhea, blood in your stool and weakness. These could be signs of a condition known as cutaneous vasculitis
- Symptoms of jaundice, fatigue, abdominal pain, joint pain and swelling. These could be signs of a condition known as autoimmune hepatitis. Please note that while taking Nitrofurantoin Tablets your urine may become dark yellow or brown coloured. This is quite normal and not a reason to stop taking the medicine. Other side effects include: Rare (may affect up to 1 in 1,000 people)
- Loss of consciousness (collapse)
- Damage to bone marrow causing deficiency of the red blood cells (Anaemia) Not known (frequency cannot be estimated from the available data)
- Feeling sick (nausea) and headache
- Loose stools
- Loss of appetite, stomach ache, and being sick (vomiting)
- Dizziness, drowsiness
- Blood cells have been affected in some patients. This may result in bruising, delayed clotting of the blood, sore throat, fever, anaemia, and a susceptibility to colds or persistent cold
- A variety of skin rashes or reactions have occurred in some patients. These may appear as flaking skin, a red rash or fever accompanied by rapid heart rate and severe rash with blistering. Other reactions may include inflammation of salivary glands (causing facial pains), inflammation of the pancreas gland (causing severe abdominal pain) and joint pains
- Short-term hair loss
- Urinary infection by germs which are not sensitive to Nitrofurantoin Tablets.
- Inflammation of small blood vessel walls, causing skin lesions
- Liver inflammation due to turn of immune system against liver cells
- Inflammation of kidney tissue surrounding tubules, causing renal impairment Reporting of side effects If you get any side effects, talk to your doctor, pharmacist or nurse. This includes any possible side effects not listed in this leaflet. You can also report side effects directly via the MHRA yellow card scheme website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store. By reporting side effects you can help provide more information on the safety of this medicine. 5.
How to store it
Nitrofurantoin Tablets
Keep this medicine out of the sight and reach of children. Do not use this medicine after the expiry date which is stated on the carton and label. The expiry date refers to the last day of that month. This product does not require any special storage conditions. Do not throw away any medicines via wastewater or household waste. Ask your pharmacist how to throw away medicines you no longer use. These measures will help protect the environment. 6.
Contents of the pack and other information
What Nitrofurantoin Tablets contains The active substance is Nitrofurantoin. Nitrofurantoin Tablets are available in two strengths, containing either 50 mg or 100 mg Nitrofurantoin. Nitrofurantoin Tablets are available in PVC – Aluminium blisters containing 20, 28, 30, 50 or 100 tablets. The other ingredients are maize starch, lactose monohydrate, magnesium stearate and polyvidone What Nitrofurantoin Tablets looks like and contents of the pack 50 mg Tablet Yellow, round, biconvex tablets with a single score line on one side, approximately 8.0 mm ± 0.2 mm in diameter. The score line is not intended for breaking the tablet. 100 mg Tablet Yellow, round, biplane with bevelled edge tablets with a single score line on one side and debossed "I" on the other side, approximately 10.0 mm ± 0.2 mm in diameter. The score line is not intended for breaking the tablet. Marketing Authorisation Holder Glenmark Pharmaceuticals Europe Limited Laxmi House 2-B Draycott Avenue Kenton Middlesex HA3 0BU United Kingdom
Manufacturer IASIS Pharmaceuticals Hellas ABEE 137 Filis Ave Kamatero Attiki 13451, Greece IASIS Pharmaceuticals Hellas ABEE – KOROPI Archimidous str. Koropi Attikis 19400, Greece This leaflet was last revised in May 2026
Frequently asked questions about Nitrofurantoin 100 mg Tablets
How do I take Nitrofurantoin 100 mg Tablets?
Nitrofurantoin 100 mg Tablets comes as tablet containing 100mg. Always follow the dose your doctor or pharmacist has given you, and read the leaflet that comes with the medicine.
What is the active substance in Nitrofurantoin 100 mg Tablets?
The active substance in Nitrofurantoin 100 mg Tablets is nitrofurantoin.
Are there equivalent medicines to Nitrofurantoin 100 mg Tablets?
Medicines with the same active substance, strength and form include: Nitrofurantoin 100 mg Tablets, Nitrofurantoin 100 mg tablets. They are interchangeable only if your prescriber or pharmacist says so.
Where does this information come from?
This leaflet reproduces the patient information leaflet approved for Nitrofurantoin 100 mg Tablets, as published on the electronic medicines compendium (emc). The version printed inside your medicine’s packaging is the one that applies to you.
Can I get Nitrofurantoin 100 mg Tablets without a prescription?
Whether a medicine is available over the counter or on prescription only depends on its licence. Check the leaflet, or ask your pharmacist — they can tell you straight away.
About this leaflet
The text above reproduces the patient information leaflet approved for this medicine, restructured for easier reading.
- Source: electronic medicines compendium (emc), Datapharm
- Active substance: nitrofurantoin
- Official document: view the original leaflet on emc →
⚕For healthcare professionals — Summary of Product Characteristics (SmPC)Full SmPC: dosage, interactions, contraindications, warnings+
4.1. Therapeutic indications
For the treatment of and prophylaxis against acute or recurrent, uncomplicated lower urinary tract infections or pyelitis either spontaneous or following surgical procedures.
Nitrofurantoin is specifically indicated for the treatment of infections due to susceptible strains of Escherichia coli, Enterococci, Staphylococci, Citrobacter, Klebsiella and Enterobacter.
4.2. Posology and method of administration
Posology
Adults
Acute Uncomplicated Urinary Tract Infections: 50 mg four times daily for seven days
Severe Chronic Recurrence: 100 mg four times a day for seven days
Long Term Suppression: 50 mg – 100 mg once a day.
Prophylaxis: 50 mg four times daily for the duration of procedure and 3 days thereafter.
Paediatric population
Children and Infants over three months of age
Acute Urinary Tract Infections: 3 mg/kg/day in four divided doses for seven days.
Suppressive: 1 mg/kg, once a day.
For children under 25kg body weight consideration should be given to the use of Nitrofurantoin Oral Suspension.
Elderly
Provided there is no significant renal impairment, in which Nitrofurantoin is contraindicated, the dosage should be that for any normal adult. See precaution and risks to elderly patients associated with long-term therapy (see section 4.8).
Renal impairment
Nitrofurantoin is contraindicated in patients with renal dysfunction and in patients with an eGFR of less than 45 ml/minute (see sections 4.3 & 4.4).
Method of administration
For oral use. This medicine should always be taken with food or milk. Taking Nitrofurantoin Tablets with a meal improves absorption and is important for optimal efficacy.
4.3. Contraindications
• Hypersensitivity to the active substance, other nitrofurans or to any of the excipients listed in section 6.1.
• Patients suffering from renal dysfunction with an eGFR below 45 ml/minute.
• G6PD deficiency (see also Section 4.6)
Acute porphyria.
• In infants under three months of age as well as pregnant patients at term (during labour and delivery) because of the theoretical possibility of haemolytic anaemia in the foetus or in the newborn infant due to immature erythrocyte enzyme systems.
4.4. Special warnings and precautions for use
Hepatotoxicity
Hepatic reactions, including hepatitis, autoimmune hepatitis, cholestatic jaundice, chronic active hepatitis, and hepatic necrosis, occur rarely. Fatalities have been reported. The onset of chronic active hepatitis may be insidious, and patients should be monitored periodically for changes in biochemical tests that would indicate liver injury. If hepatitis occurs, the drug should be withdrawn immediately and appropriate measures should be taken.
Pulmonary adverse reactions
Acute, subacute and chronic pulmonary reactions have been observed in patients treated with nitrofurantoin. If these reactions occur, nitrofurantoin should be discontinued immediately. Signs of pulmonary damage include difficulty and or pain when breathing, shortness of breath and coughing up blood or mucus.
Chronic pulmonary reactions
Chronic pulmonary reactions (including pulmonary fibrosis and diffuse interstitial pneumonitis) can develop insidiously, and often occur in elderly patients. Close monitoring of the lung disease of patients receiving long-term therapy is indicated(especially in the elderly).
Acute pulmonary reactions
Pulmonary reactions may be acute and usually occur within the first week of treatment. Increased vigilance for respiratory symptoms in patients who have just started therapy is warranted (especially in the elderly).
Nitrofurantoin is not effective for the treatment of parenchymal infections of unilaterally non-functioning kidney. A surgical cause for infection should be excluded in recurrent or severe cases.
Nitrofurantoin may be used with caution as short-course therapy only for the treatment of uncomplicated lower urinary tract infection in individual cases with an eGFR between 30-44 ml/min to treat resistant pathogens, when the benefits are expected to outweigh the risks.
Since pre-existing conditions may mask adverse reactions, Nitrofurantoin should be used with caution in patients with pulmonary disease, hepatic dysfunction, neurological disorders, and allergic diathesis.
Peripheral neuropathy and susceptibility to peripheral neuropathy, which may become severe or irreversible, has occurred and may be life threatening. Therefore, treatment should be stopped at the first signs of neural involvement (paraesthesia).
Nitrofurantoin should be used in caution with patients with anaemia, diabetes mellitus, electrolyte imbalance, debilitating conditions and vitamin B (particularly folate) deficiency.
Patients should be monitored closely for signs of hepatitis (particularly in long-term use). Urine may be coloured yellow or brown after taking Nitrofurantoin. Patients on Nitrofurantoin are susceptible to false positive urinary glucose (If tested for reducing substances).
Nitrofurantoin should be discontinued at any sign of haemolysis in those with suspected glucose-6-phosphate dehydrogenase deficiency.
Discontinue treatment with Nitrofurantoin if otherwise unexplained pulmonary, hepatic, haematological or neurological syndromes occur.
Tablets contains lactose
Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take this medicine.
4.5. Interaction with other medicinal products and other forms of interaction
1. Increased absorption with food or agents delaying gastric emptying.
2. Decreased absorption with magnesium trisilicate.
3. Decreased renal excretion of Nitrofurantoin by probenecid and sulfinpyrazone.
4. Decreased anti-bacterial activity by carbonic anhydrase inhibitors and urine alkalisation.
5. Anti-bacterial antagonism by quinolone anti-infectives.
6. Interference with some tests for glucose in urine.
7. As Nitrofurantoin belongs to the group of Antibacterials, it will have the following resulting interactions:
• Typhoid Vaccine (oral): Antibacterials inactivate oral typhoid vaccine.
4.6. Fertility, pregnancy and lactation
Pregnancy
Animal studies with Nitrofurantoin have shown no teratogenic effects, however study in rats has shown reproductive toxicity (see section 5.3). Nitrofurantoin has been in extensive clinical use since 1952, and its suitability in human pregnancy has been well documented. However, as with all other drugs, the maternal side effects may adversely affect course of pregnancy. The drug should be used at the lowest dose as appropriate for a specific indication, only after careful assessment.
Nitrofurantoin is however contraindicated in infants under three months of age and in pregnant women during labour and delivery, because of the possible risk of haemolysis of the infant's immature red cells.
Breast-feeding
Breast-feeding an infant known or suspected to have an erythrocyte enzyme deficiency (including G6PD deficiency), must be temporarily avoided, since Nitrofurantoin is detected in trace amounts in breast milk.
Fertility
No data available
4.7. Effects on ability to drive and use machines
Nitrofurantoin may cause dizziness and drowsiness and the patient should not drive or operate machinery if affected this way.
4.8. Undesirable effects
A tabulated list of undesirable effects is outlined below:
The undesirable effects are listed according to organ systems and following frequencies:
Rare (≤1/10,000 to <1/1,000)
Not known (cannot be estimated from the available data)
System organ class
Frequency
Adverse reaction
Infections and infestations
Not known
Superinfections by fungi or resistant organisms such as Pseudomonas. However, these are limited to the genitourinary tract.
Blood and lymphatic system disorders
Rare
Not known
Aplastic anaemia.
Agranulocytosis, leucopenia, granulocytopenia, haemolytic anaemia, thrombocytopenia, glucose¬6- phosphate dehydrogenase deficiency anaemia, megaloblastic anaemia and eosinophilia.
Immune system disorders
Not known
Allergic skin reactions, angioneurotic oedema and anaphylaxis.
Psychiatric disorders
Not known
Depression, euphoria, confusion, psychotic reactions.
Nervous system disorders
Not known
Peripheral neuropathy including optic neuritis (sensory as well as motor involvement), nystagmus, vertigo, dizziness, headache and drowsiness.
Benign intracranial hypertension.
Cardiac disorders
Rare
Collapse and cyanosis.
Respiratory, thoracic and mediastinal disorders
Not known
Acute pulmonary reactions*, Subacute pulmonary reactions*, Chronic pulmonary reactions*, Cough, Dyspnoea, Pulmonary fibrosis; possible association with lupus-erythematous-like syndrome.
Gastrointestinal disorders
Not known
Sialadenitis, Pancreatitis, Nausea, Anorexia, Emesis, Abdominal pain and Diarrhoea.
Hepatobiliary disorders
Not known
Cholestatic jaundice, Chronic active hepatitis (fatalities have been reported), Hepatic necrosis, autoimmune hepatitis.
Skin and subcutaneous tissue disorders
Not known
Transient alopecia Exfoliative dermatitis and erythema multiforme (including Stevens-Johnson Syndrome), maculopapular, erythematous or eczematous eruptions, urticaria, rash, and pruritus. Lupus-like syndrome associated with pulmonary reaction.
Drug Rash with Eosinophilia And Systemic Symptoms (DRESS syndrome), cutaneous vasculitis.
Renal and urinary disorders
Not known
Yellow or brown discolouration of urine, Interstitial nephritis.
General disorders and Administration site conditions
Not known
Asthenia, fever, chills, drug fever and arthralgia.
Investigations
Not known
False positive urinary glucose.
*Acute pulmonary reactions are commonly manifested by fever, chills, cough, chest pain, dyspnoea, pulmonary infiltration with consolidation or pleural effusion on chest x-ray, and eosinophilia. In subacute pulmonary reactions, fever and eosinophilia occur less often than in the acute form.
Chronic pulmonary reactions occur rarely in patients who have received continuous therapy for six months or longer and are more common in elderly patients. Changes in ECG have occurred, associated with pulmonary reactions.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the MHRA yellow card scheme website: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.
4.9. Overdose
Symptoms
Symptoms and signs of overdosage include gastric irritation, nausea and vomiting.
Management
There is no known specific antidote. Nitrofurantoin can be haemodialysed. Standard treatment is by induction of emesis or by gastric lavage in cases of recent ingestion. Monitoring of full blood count, liver function tests and pulmonary function tests, are recommended. A high fluid intake should be maintained to promote urinary excretion of the drug.
💬 Ask about this leaflet
Ask anything about Nitrofurantoin 100 mg Tablets. The assistant answers only from this leaflet — if the leaflet does not cover it, it will say so. It does not give medical advice.
Answers come from the patient leaflet published on the electronic medicines compendium (emc). They are not medical advice. Ask a pharmacist or your GP if you are unsure. For urgent help call NHS 111, or 999 in an emergency.
Medicines containing Nitrofurantoin
- Nitrofurantoin 100 mg Capsules
- Nitrofurantoin 100 mg hard capsules
- Nitrofurantoin 100 mg prolonged release capsules
- Nitrofurantoin 100mg Capsules
- Nitrofurantoin 100mg Capsules, Hard
- Nitrofurantoin 50 mg capsules
- Nitrofurantoin 50 mg Hard Capsules
- Nitrofurantoin 50 mg Tablets
- Nitrofurantoin 50mg Capsules
- Nitrofurantoin 50mg Capsules, Hard
- Nitrofurantoin CNX Therapeutics 100 mg Prolonged-Release Capsules
- Nitrofurantoin Mercury Pharma 100mg Prolonged-Release Capsules
- Nitrofurantoin RPH Pharma 100 mg prolonged-release capsules