Macrodantin Is an Antibiotic Used to Treat and Prevent Urinary Tract Infections

Macrodantin (Nitrofurantoin macrocrystals) is a prescription antibiotic used to treat and prevent uncomplicated urinary tract infections (UTIs). It's one of the most commonly prescribed UTI medications in the United States and has been in use for decades.

This guide covers everything you need to know about Macrodantin in 2026 — what it's for, how to take it, what it costs, and who should (and shouldn't) use it.

What Is Macrodantin?

Here's a quick overview of the basics:

• Generic name: Nitrofurantoin (macrocrystalline)
• Brand names: Macrodantin, Macrobid, Furadantin
• Drug class: Nitrofuran antibiotic (urinary anti-infective)
• Manufacturer: Almatica Pharma, Inc.
• Controlled substance: No — Macrodantin is not a controlled substance
• Generic available: Yes — generic Nitrofurantoin is widely available

Macrodantin is specifically designed to treat infections in the urinary tract. Unlike many antibiotics that work throughout the body, Nitrofurantoin achieves therapeutic concentrations only in the urine, not in blood or other tissues. This targeted action is what makes it effective for UTIs while causing fewer systemic side effects than broader-spectrum antibiotics.

There are several formulations of Nitrofurantoin on the market:

• Macrodantin — macrocrystalline capsules (25 mg, 50 mg, 100 mg)
• Macrobid — monohydrate/macrocrystal dual-release capsules (100 mg)
• Furadantin — microcrystalline oral suspension (25 mg/5 mL)

Macrodantin and Macrobid are the most commonly prescribed. The main difference is dosing: Macrodantin is typically taken four times daily, while Macrobid is taken twice daily. For more on how this medication works at the molecular level, see our article on how Macrodantin works.

What Is Macrodantin Used For?

FDA-Approved Uses

• Treatment of uncomplicated UTIs caused by susceptible bacteria including E. coli, enterococci, Staphylococcus aureus, and certain Klebsiella and Enterobacter species
• Prevention (prophylaxis) of recurrent UTIs

Off-Label Uses

• Long-term suppressive therapy for patients with frequent recurrent UTIs
• UTI prevention before urologic procedures

Macrodantin is a first-line treatment for uncomplicated UTIs according to major treatment guidelines. It's particularly valued because bacterial resistance to Nitrofurantoin remains very low compared to other antibiotics — making it a reliable choice even as antibiotic resistance becomes a bigger problem worldwide.

How Is Macrodantin Taken?

For Treating a UTI (Acute Treatment)

• Macrodantin: 50-100 mg four times daily for 5-7 days
• Macrobid: 100 mg twice daily for 5-7 days
• Pediatric dosing (children over 1 month): 5-7 mg/kg/day divided into four doses

For Preventing Recurrent UTIs (Suppressive Therapy)

• 50-100 mg once daily at bedtime

Important Instructions

• Take with food — This improves absorption and significantly reduces nausea and stomach upset. A full meal works best.
• Swallow capsules whole with a full glass of water.
• Complete the entire course — Even if you feel better after 2-3 days, finish all your medication. Stopping early increases the risk of the infection coming back and contributes to antibiotic resistance.
• Expect brown urine — Macrodantin turns urine a rust or brownish color. This is completely normal and harmless.

Who Should Not Take Macrodantin?

Macrodantin is not safe for everyone. It is contraindicated (should not be used) in the following situations:

• Severe kidney impairment — If your creatinine clearance is below 30 mL/min, Macrodantin won't reach effective concentrations in the urine and the risk of toxicity increases.
• Neonates under 1 month of age — Due to the risk of hemolytic anemia.
• Pregnant women at term (38-42 weeks) and during labor and delivery — Risk of hemolytic anemia in the newborn.
• History of liver problems with Nitrofurantoin — If you've previously had cholestatic jaundice or liver dysfunction from this medication.
• Known allergy to Nitrofurantoin

Use with caution in patients with:

• G6PD deficiency (risk of hemolytic anemia)
• Anemia or vitamin B deficiency
• Diabetes
• Electrolyte imbalances
• Liver impairment

For a detailed look at who's at higher risk for side effects, read our Macrodantin side effects guide.

How Much Does Macrodantin Cost?

The cost of Macrodantin varies significantly depending on whether you have insurance, which formulation you need, and whether you use discount coupons.

Without Insurance

• Brand-name Macrodantin: $30-$110 for a typical course
• Generic Nitrofurantoin macrocrystals: $33-$58 retail, or as low as $9-$15 with a discount coupon from GoodRx or SingleCare
• Generic Macrobid (Nitrofurantoin mono/macro): As low as $7-$11 with coupons

With Insurance

Generic Nitrofurantoin is widely covered by most insurance plans, typically on Tier 1 or Tier 2, meaning the lowest copay levels. Brand-name Macrodantin may be on Tier 3 and could require prior authorization. Medicare Part D plans generally cover generic Nitrofurantoin.

Ways to Save

• Discount coupons: GoodRx and SingleCare can reduce the out-of-pocket cost to as low as $7-$15
• Manufacturer programs: Almatica Pharma offers patient copay savings programs. Contact them at 1-844-889-8686.
• Patient assistance programs: NeedyMeds and RxAssist list assistance programs for Nitrofurantoin for patients with financial hardship.

For a complete breakdown of savings options, see our guide to saving money on Macrodantin.

Final Thoughts

Macrodantin is a proven, effective antibiotic that's been treating UTIs for decades. It remains a first-line choice because of its targeted action in the urinary tract, low resistance rates, and affordable generic options. For most patients with uncomplicated UTIs, a 5-7 day course is all it takes.

If you have questions about whether Macrodantin is right for you, talk to your doctor. And if you need help finding it at a pharmacy near you, Medfinder can help you check availability and compare prices.