Nitrofurantoin 50mg, 100mg (M/R)

Buy Nitrofurantoin for Cystitis

Nitrofurantoin is the first line antibiotic treatment for cystitis, especially if trimethoprim has been used within the last 12 months. Nitrofurantoin has been found to have less bacterial resistance than trimethoprim. It is available in 50mg tablets and 100mg modified release (M/R) capsules. Our doctors will recommend the best choice of antibiotic depending on the information provided during your consultation.

All our products are genuine UK medicines and are dispensed by our partner pharmacy based in the UK.

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  • First line antibiotic for the treatment of cystitis
  • Available in 50mg tablets and 100mg M/R (modified release) capsules
  • Generally less bacterial resistance than trimethoprim
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Nitrofurantoin is an antibiotic. It is used to prevent and treat infections of the bladder, kidney and other parts of the urinary tract.


Do not take Nitrofurantoin if:

  • you are allergic (hypersensitive) to nitrofurantoin or any of the other ingredients listed in the patient information leaflet
  • you have a disease of the kidneys which is severely affecting the way they work
  • you are in the final stages of pregnancy (labour or delivery) as there is a risk that it might affect the baby
  • you have porphyria (blood disorder)
  • you are a patient with G6PD (glucose-6-phosphate dehydrogenase) deficiency
  • you are breastfeeding a baby with suspected or known deficiency in an enzyme called G6PD (glucose-6-phosphate-dehydrogenase)
Pregnancy and Breastfeeding

Nitrofurantoin 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 breastfeed, please consult your doctor first.

Important Interactions

You must tell your doctor if you are taking, have recently taken or might take other medicines, in particular:

  • 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
Side Effects
  • feeling sick (nausea) and headache
  • loose stools
  • diarrhoea
  • loss of appetite, stomach ache and being sick (vomiting)
  • dizziness, drowsiness
Please Note

All medication can cause side effects. We have only listed a few to be aware of. Details of all side effects, including rare side effects to be aware of, are listed in the patient information leaflet (PIL). When completing your medical questionnaire, it is very important that you answer the questions truthfully. This is to ensure your doctor has a full picture of your medical history before prescribing. List all medicines you are already taking, including non-prescription and herbal medicines.


Some cystitis infections may clear up of their own accord. You can ease symptoms by drinking 2-3 litres a day to flush the bladder and by taking cranberry tablets which are available from your pharmacy. Trimethoprim is another antibiotic available if Nitrofurantoin is not appropriate. Other antibiotics can be used for the treatment of more serious cases of cystitis. These are not prescribed by Anytime Doctor as more serious UTIs may need close monitoring.

Looking after your medicine

Do not take medicines after the expiry date stamped on the pack. Keep all medicines out of the reach and sight of children.

Medicines are only intended to be used by the person they are prescribed for. Do not give your prescribed medicine to anybody else, even if they have the same symptoms as you. Medicines can be harmful if used by anybody other than the person they have been prescribed for.

References Nitrofurantoin 50mg Patient Information Leaflet
Nitrofurantoin 100mg (M/R) Patient Information Leaflet
British National Formulary: nitrofurantoin
Last reviewed & updated  21/04/2020   Authored  04/09/2009

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