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Nitrofurantoin: Antibiotic for Urinary Tract Infections

Nitrofurantoin is an antibiotic used to treat urinary tract infections. It works by targeting bacteria in the bladder and lower urinary tract.

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Things worth knowing about "Nitrofurantoin"

Nitrofurantoin is an antibiotic used to treat urinary tract infections. It works by targeting bacteria in the bladder and lower urinary tract.

What is Nitrofurantoin?

Nitrofurantoin is an antibiotic specifically used to treat urinary tract infections (UTIs). It belongs to the nitrofuran class of antibiotics and has been a well-established treatment for bacterial infections of the bladder and lower urinary tract for decades. The medication is available by prescription and is typically taken as a tablet or capsule.

Indications

Nitrofurantoin is primarily used for:

Uncomplicated urinary tract infections (e.g., cystitis, bladder infection)
Prophylaxis (prevention) of recurrent UTIs in susceptible patients

It is not suitable for the treatment of kidney infections (pyelonephritis) or complicated UTIs, as drug concentrations in kidney tissue are insufficient.

Mechanism of Action

After oral ingestion, nitrofurantoin is rapidly absorbed and excreted primarily through the kidneys, achieving high concentrations in the urine. Within the urine, the drug is converted by bacterial enzymes into reactive intermediates that:

Damage bacterial DNA
Inhibit key bacterial metabolic enzymes
Disrupt bacterial cell wall synthesis

This multi-target mechanism of action makes the development of resistance comparatively uncommon.

Dosage

Dosage depends on the formulation (immediate-release or modified-release) and the clinical indication:

Acute cystitis: Typically 50–100 mg, 3–4 times daily for 5–7 days (immediate-release) or 100 mg modified-release twice daily for 5 days
Long-term prophylaxis: 50–100 mg once nightly

Nitrofurantoin should always be taken with food to improve absorption and reduce the risk of gastrointestinal side effects.

Side Effects

Like all medications, nitrofurantoin can cause side effects. Common and clinically relevant adverse effects include:

Gastrointestinal complaints: Nausea, vomiting, diarrhea
Urine discoloration: Dark yellow to brown urine (harmless)
Allergic reactions: Skin rash, itching
Pulmonary toxicity: Rarely, with long-term use, cough, shortness of breath, or pulmonary fibrosis may occur
Hepatotoxicity: Very rare but possible with prolonged therapy
Peripheral neuropathy: Tingling or numbness in the hands and feet with extended use

Contraindications

Nitrofurantoin must not be used in:

Severe renal impairment (eGFR < 30 ml/min), as impaired renal excretion can lead to toxic drug accumulation
Pregnancy from week 38 onwards (risk to the newborn)
Infants under one month of age
Patients with known G6PD deficiency (glucose-6-phosphate dehydrogenase deficiency) due to the risk of hemolytic anemia

Drug Interactions

Important interactions with nitrofurantoin include:

Antacids containing magnesium trisilicate may reduce absorption
Probenecid and sulfinpyrazone may inhibit renal excretion, leading to elevated plasma levels
Concurrent use of other nephrotoxic or neurotoxic agents should be avoided

Treatment Context

According to guidelines from the European Association of Urology (EAU) and the Infectious Diseases Society of America (IDSA), nitrofurantoin is considered a first-line treatment for uncomplicated cystitis. A key advantage is its low resistance rate against common urinary pathogens such as Escherichia coli.

References

European Association of Urology (EAU): Guidelines on Urological Infections, 2023. Available at: https://uroweb.org
Gupta K et al. - International Clinical Practice Guidelines for the Treatment of Acute Uncomplicated Cystitis and Pyelonephritis in Women. Clinical Infectious Diseases, 2011;52(5):e103–e120.
British National Formulary (BNF): Nitrofurantoin monograph, current edition. Available at: https://bnf.nice.org.uk

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