Macrodantin (Nitrofurantoin)

Nitrofurantoin is a nitrofuran antibiotic that is absorbed orally and rapidly excreted into the urine. In the urinary tract it is reduced by bacterial enzymes to reactive intermediates that damage bacterial DNA, ribosomal proteins, and cell‑wall synthesis enzymes, disrupting carbohydrate metabolism and leading to bacterial cell death.

The dosage regimen is determined by the prescribing clinician based on infection severity, renal function, and individual patient characteristics. Typical adult regimens range from 50‑100 mg taken two to four times daily for a short course, but exact dosing must be individualized and follows the prescriber’s order.

Safety data for nitrofurantoin are limited; it is classified as a pregnancy category unknown drug and is generally avoided in the first trimester and at term because of potential fetal hemolysis. Nitrofurantoin is excreted in breast milk, so use while breastfeeding should be considered only if the benefit outweighs the risk and after consulting a healthcare professional.

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Compared with trimethoprim‑sulfamethoxazole or fluoroquinolones, nitrofurantoin offers a narrower spectrum focused on common uropathogens and has a low propensity for promoting resistance. However, it requires adequate renal function for effective urinary concentration and carries a risk of pulmonary or hepatic toxicity, which are less common with some alternative agents.

Macrodantin tablets should be stored at ambient temperature, below 25 °C, in the original container to protect from moisture and light. Keep the product out of reach of children and do not use if the packaging is damaged or the tablets appear discolored.

Macrodantin is taken orally, usually with food or milk to improve gastrointestinal tolerance. The tablets should be swallowed whole with a full glass of water and not crushed or chewed unless specifically instructed by a healthcare professional. Consistent timing of doses helps maintain effective urinary concentrations.

The most serious adverse reactions include pulmonary toxicity such as interstitial pneumonitis, hepatic injury ranging from hepatitis to jaundice, severe hypersensitivity reactions like anaphylaxis or Stevens‑Johnson syndrome, and hemolytic anemia in patients with glucose‑6‑phosphate dehydrogenase deficiency. Prompt medical attention is required if any of these symptoms develop.

Macrodantin is contraindicated in patients with known hypersensitivity to nitrofurantoin or other nitrofurans, those with severe renal impairment (creatinine clearance < 30 mL/min), and individuals with glucose‑6‑phosphate dehydrogenase deficiency due to the risk of hemolysis. Caution is also advised in pregnant women, especially in the first trimester and near term, and in patients with a history of pulmonary or hepatic disease.