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Nitrofurantoin

Nitrofurantoin is a widely used antibiotic prescribed to treat urinary tract infections (UTIs), particularly cystitis. It works by targeting bacteria that cause infection, preventing their growth and aiding your immune system in fighting them off.

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Dose guides: 50mg

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Nitrofurantoin 100mg product packaging

Medically reviewed by Muhammad Abdul Jalil, Superintendent Pharmacist · GPhC Reg No: 2236161

Last reviewed

Nitrofurantoin: Effective Antibiotic for Treating UTIs

What is Nitrofurantoin?

Nitrofurantoin is a widely used antibiotic prescribed to treat urinary tract infections (UTIs), particularly cystitis. It works by targeting bacteria that cause infection, preventing their growth and aiding your immune system in fighting them off.

This antibiotic is available as a generic drug or under branded names, such as MacroBID, in 100mg modified-release (MR) capsules. Medihealth Direct offers Nitrofurantoin with the same active ingredient and efficacy as branded options.

How Does Nitrofurantoin Work?

Nitrofurantoin is absorbed into the body and concentrated in the urine, where it acts to combat the bacteria-causing infection.

Key Actions:

  1. Damages Bacterial DNA – Prevents bacteria from duplicating.
  2. Stops Protein Production – Limits the bacteria’s ability to grow and spread.

To effectively clear the infection, it is crucial to complete the prescribed course, even if symptoms improve early.

How to Take Nitrofurantoin

General Dosage Instructions

  • Take tablets whole—do not crush or split them.
  • Take with food or milk to aid absorption and reduce nausea.
  • Always complete the prescribed course of treatment.

Dosage for Women

  • 100mg (MR) capsule: Take one capsule twice daily for 3 days.
  • 50mg tablets: Take one tablet four times daily for 3 days.

If symptoms persist beyond 3 days, continue for up to 7 days. Seek medical advice if symptoms persist beyond 7 days.

Dosage for Men

Nitrofurantoin is not available online for men due to the need for in-person diagnosis. Men should consult their GP for UTI treatment.

How Long Does Nitrofurantoin Take to Work?

For most patients:

  • 3-day course: Symptoms should resolve within 7 days of starting treatment.
  • 7-day course: Infection should clear by the end of the course.

If symptoms persist, consult your healthcare professional.

Possible Side Effects of Nitrofurantoin

Common Side Effects

  • Nausea
  • Vomiting
  • Stomach pain
  • Loss of appetite
  • Diarrhoea
  • Dizziness
  • Headaches

Rare but Serious Side Effects

Seek immediate medical help if you experience:

  • Breathing difficulties
  • Allergic reactions, such as swelling or severe rash
  • Persistent or severe side effects

Precautions Before Taking Nitrofurantoin

Consult your healthcare professional before starting Nitrofurantoin, especially if you:

  • Have kidney problems.
  • Are in the later stages of pregnancy.
  • Have porphyria or G6PD deficiency.
  • Are allergic to Nitrofurantoin or its ingredients.

Avoid alcohol during treatment and drink plenty of water to help flush bacteria from your urinary tract.

Can I Buy Nitrofurantoin Online from Medihealth Direct?

Mizollen is not suitable for individuals with:

  • Allergies to mizolastine or any other ingredients in the medication.
  • Liver or kidney conditions.
  • Cardiac disease or heart rhythm irregularities.
  • Susceptibility to QT-interval prolongation.
  • Low potassium levels.

Pregnant or breastfeeding women should consult a healthcare professional before using Mizollen.

Nitrofurantoin FAQs

What is Nitrofurantoin used for?

Nitrofurantoin is used to treat UTIs, bladder infections, and kidney infections.

Can men use Nitrofurantoin?

Men should consult their healthcare professional for in-person diagnosis and prescription.

Is Nitrofurantoin safe during pregnancy?

Yes, but only during the first trimester. Avoid Nitrofurantoin in the later stages of pregnancy.

Can I drink alcohol while taking Nitrofurantoin?

Yes, but avoid excessive drinking, as alcohol can worsen side effects like nausea.

Does Nitrofurantoin treat bacterial vaginosis or chlamydia?

No, Nitrofurantoin is not effective for these conditions. Alternative antibiotics, such as Metronidazole, are prescribed.

How long do side effects last?

Most side effects subside within a few days. If symptoms persist, consult your healthcare professional.

Transparent pricing

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Price
£11.24
What's included
  • Online consultation & prescription from a UK clinician
  • Discreet, tracked deliveryRoyal Mail tracked delivery is £2.99 per order, added at checkout.
  • Ongoing clinical support from our pharmacy team

You're only charged after a prescriber approves your consultation. If it's not right for you, you're not charged.

Delivery & packaging

  • Royal Mail tracked delivery
    £2.99 per order
  • Next-day
    Order by 2pm Monday to Friday and an approved order is dispatched the same day for next-working-day delivery.
  • Packaging
    Every parcel is plain and unbranded; temperature-sensitive medicines travel in insulated cold-chain packaging at no extra cost.

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