Treat UTIs fast

Experience fast relief. Clear your UTI with antibiotics within 7 days.

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FDA Approved Drugs

Nitrofurantoin

100mg
14 capsules Full course of 7 days
$59.99
$59.99 Incl. Rx and shipping
Why choose Nitrofurantoin
  • Effective first-line treatment – Often the first choice for treating uncomplicated UTIs.
  • Reduced risk of resistance – Less likely to lead to bacterial resistance compared to other antibiotics.
  • Short treatment course – Typically prescribed for a 7 day course.
  • Well-tolerated – Generally causes fewer side effects than other UTI antibiotics.
Good to know*
  • Common side effects include nausea, headache, and stomach upset.
  • It’s important to take it with food to reduce stomach irritation.
  • Avoid excessive alcohol consumption to reduce the risk of side effects.
Delivery & discretion
  • Free shipping on all orders
  • Delivery in 2-3 working days
  • Need it quick: priority shipping option available in checkout
  • Comes in plain packaging
Our service
  • No insurance needed
  • No in-person doctor visit needed with our quick online consultation
  • No prescription needed
  • Reviewed by US-licensed physicians
  • Dispensed from US -licensed pharmacy
  • FDA-approved medication

How to use

Nitrofurantoin

Apply

Take twice daily

Take 1 x 100mg capsule, twice a day (every 12 hours) for 7 days.

Swallow whole with water or milk. Do not crush or chew.

Wait

Take with food

Always take with food or milk.

Food makes it more effective and helps to reduce stomach side effects.

Symptom-free

Symptom-free

You’ll feel better in 2–3 days, but you must finish the full course.
This ensures the infection is completely treated and doesn’t return.

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Key facts

Nitrofurantoin

key facts banner
  • Used for

    Treats urinary tract infections (UTIs) in women and men.

  • How to use it*

    Take 100mg twice daily for 7 days, with a full glass of water or food to avoid stomach irritation.

  • How long to work

    Relief typically within 1-2 days; complete the full 7-day course even if symptoms improve earlier.

  • Common side effects*

    Nausea, headache, diarrhea, and stomach upset.

  • Who should not take it*

    Avoid during pregnancy (especially near term), if allergic to Nitrofurantoin, or if you have severe kidney problems.

  • Interactions*

    Avoid with antacids containing magnesium; avoid alcohol as it can make UTI symptoms worse.

  • Generic/branded

    Generic: Nitrofurantoin.
    Brand: Macrobid.

* Always consult the patient leaflet for comprehensive information.

About Nitrofurantoin

What is Nitrofurantoin and how does it work?

Nitrofurantoin belongs to a group of medicines called antibiotics. It is used to treat bacterial infections, such as UTIs.

Nitrofurantoin works by killing the bacteria that is causing the infection. When you take this medicine orally, most of it gets filtered out of the blood and into your urine. This means that this medicine is concentrated where the causative bacteria are. Once there, the medicine enters the bacterial cells and damages their DNA, stopping them from growing and multiplying, which treats the infection.

Is Nitrofurantoin an antibiotic?

Yes, Nitrofurantoin is an antibiotic. However, until broad-spectrum antibiotics that work within the entire body, this medicine is concentrated in the urine, making it ideal for treating bladder and lower urinary tract infections.

How to use Nitrofurantoin

Who can use Nitrofurantoin?

Nitrofurantoin is suitable for adults with urinary tract infections. It's generally safe for most people, but there are some exceptions.

You should not take Nitrofurantoin if you are allergic to the active ingredient, or to any of the other ingredients in this medicine.

You should also avoid Nitrofurantoin if you:

  • Have kidney disease
  • Are in the final stages of pregnancy
  • You have acute porphyria (a blood disorder)
  • You have G6PD deficiency

Consult your doctor before taking this medicine if you have any of the following medical conditons:

  • Diabetes
  • Anaemia
  • Vitamin B deficiency
  • Lactose intolerance
  • Any illness that causes severe weakness
  • Disease of the lungs, liver or nervous system.
  • If your urine is dark yellow or brown coloured.

Tell your doctor or pharmacist if you take any other medicines, natural health products or supplements. The effect of some medicines may change if they are taken with Nitrofurantoin, especially the following:

  • Antacids for indigestion (e.g. magnesium trisilicate)
  • Medicines for gout (e.g. probenecid, sulfinpyrazone)
  • Medicines which slow the passage of food through the stomach (e.g. atropine, hyoscine)
  • Medicines for glaucoma (e.g. acetazolamide)
  • Medicines which make the urine less acidic (e.g. potassium citrate mixture)
  • Certain antibiotics (e.g. quinolones)
  • Typhoid vaccine, which is given for the prevention of typhoid.

For a complete list of precautions and medicine interactions, consult the patient information leaflet.

How long does it take to work?

Most people start feeling better within 2–3 days of taking this medicine, however it's important to finish the full course, even if you feel better. This will ensure the infection is properly treated and doesn't return.

Safety & side effects

What are the possible side effects?

Common side effects:

  • nausea or vomiting
  • headache
  • loss of appetite
  • stomach ache
  • diarrhea
  • dizziness or vertigo
  • drowsiness
  • dark yellow or brown colored urine

Serious side effects:

You should stop taking Nitrofurantoin and seek immediate medical attention if you experience any of the following side effects:

  • signs of an allergic reaction (wheeziness, difficulty in breathing, swelling of the eyelids, face or lips, rash or itching)
  • fever, shivering, coughing and shortness of breath
  • jaundice (yellowing of the skin or whites of the eyes)
  • nerve problems
  • raised pressure in the skull (causing severe headaches)
  • blue or purple skin color due to low oxygen levels
  • blood in the stool

Buying Nitrofurantoin

Can I buy Nitrofurantoin online?

Yes, you can buy Nitrofurantoin capsules online at SpeedyHealth after completing our free online consultation.

How do I get a prescription for Nitrofurantoin?

You must complete an online consultation as Nitrofurantoin is a prescription-only medication. This is a quick and easy process which allows our doctors to ensure this medicine is safe and suitable for you to use.

Medically reviewed by Dr. Adrian Rawlinson

Written by our editorial team | Last reviewed January 13, 2026

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