Nitrofurantoin Tablets

Generic Name:
Nitrofurantoin Tablets
Therapeutic Category:
Urinary Tract Antibacterial / Nitrofuran Derivative
Mechanism of Action:
Unique multi-targeted mechanism. Bacterial enzymes (nitroriductases) reduce nitrofurantoin into highly reactive, unstable intermediates. These intermediates rapidly attack and damage bacterial ribosomal proteins, DNA, RNA, and cell wall synthesis pathways, leading to cell death. Because it strikes multiple targets simultaneously, the development of bacterial resistance remains exceptionally low.

Indications

Dosage & Administration

Contraindications & Precautions

Potential Side Effects

Indications (Therapeutic Uses)

Nitrofurantoin 100 mg is highly concentrated in the urine and is strictly indicated for the prevention and treatment of infections localized within the urinary tract:

  • Acute Uncomplicated Cystitis: Treatment of acute bladder infections caused by susceptible strains of Escherichia coli, Enterococci, Staphylococcus aureus, and certain strains of Klebsiella and Enterobacter species.
  • UTI Prophylaxis (Prevention): Long-term, low-dose suppression of recurrent urinary tract infections in individuals prone to frequent chronic bladder infections.
  • Post-Coital Prophylaxis: Prevention of sexual intercourse-induced cystitis in susceptible individuals.

Dosage & Administration

Website Note: Dosage and duration of therapy must be individualized by a registered medical practitioner based on whether the medication is being used for active treatment or long-term prevention.

  • Standard Adult Dose (Active Infection): Typically 50 mg to 100 mg taken orally four times daily (every 6 hours) for a duration of 3 to 7 days. Alternatively, if a modified or macrocrystalline form is utilized, it may be dosed twice daily as directed.
  • Standard Adult Dose (Long-Term Prevention): 50 mg to 100 mg taken orally once daily at bedtime.
  • Administration: Tablets must be swallowed whole with a glass of water. Take strictly with food or milk. Administering this medication with a meal significantly improves its absorption in the gut and dramatically reduces common gastrointestinal side effects like nausea.

Contraindications & Precautions

  • Absolute Contraindications: Do not use in patients with a history of hypersensitivity to nitrofurantoin or any components of the tablet. Completely contraindicated in patients with significant renal impairment (creatinine clearance less than 30 mL/min or an elevated serum creatinine), as the drug will not reach effective therapeutic concentrations in the urine, increasing the risk of systemic toxicity.
  • Pregnancy and Neonatal Contraindications: Contraindicated in pregnant patients at term (38 to 42 weeks gestation), during labor and delivery, or when the onset of labor is imminent. Do not administer to neonates under one month of age. Nitrofurantoin can induce hemolytic anemia in these populations due to immature erythrocyte enzyme systems (glutathione instability).
  • Pulmonary Toxicity Warning: Both acute and chronic pulmonary reactions can occur. Acute reactions usually manifest within days of starting therapy with fever, chills, cough, and shortness of breath. Chronic pulmonary reactions (such as interstitial pneumonitis or pulmonary fibrosis) are rare but can occur during long-term prophylaxis therapy. Monitor lung function closely during extended use.
  • Hepatotoxicity: Rare but serious hepatic reactions, including hepatitis, cholestatic jaundice, and hepatic necrosis, have occurred. Discontinue immediately if liver function biomarkers elevate or jaundice appears.
  • Peripheral Neuropathy: May cause severe, potentially irreversible nerve damage (peripheral neuropathy), presenting as numbness, tingling, or muscle weakness. Risk is significantly elevated in patients with anemia, diabetes, or electrolyte imbalances.
  • Urine Discoloration Note: Nitrofurantoin may cause the urine to turn a harmless dark yellow or brown color. This is a normal cosmetic property of the drug and is not a cause for concern.

Potential Side Effects

  • Common / Mild: Nausea, vomiting, loss of appetite, abdominal gas, headache, dizziness, and dark yellow/brown discoloration of urine.
  • Less Common / Severe: Acute or chronic pulmonary toxicity (interstitial pneumonitis/fibrosis), severe peripheral neuropathy, drug-induced hepatitis, hemolytic anemia (particularly in individuals with G6PD deficiency), and severe cutaneous adverse reactions (such as exfoliative dermatitis).
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