Nitrofurantoin (Macrobid, Macrodantin) is the IDSA-recommended first-line antibiotic for uncomplicated UTI. It concentrates in urine with minimal systemic exposure, resistance rates stay low, and a 5-day course typically resolves symptoms in 24–48 hours. Bidwell reviews UTI intakes same-day and sends your prescription to the pharmacy for $45 flat. Generic Macrobid costs $10–$20 cash per course.
Nitrofurantoin is a nitrofuran antibiotic first introduced in 1953. Bacteria reduce the drug with their own nitroreductases into reactive intermediates that damage bacterial DNA, ribosomes, and other essential cell machinery, killing the organism. Because it's rapidly absorbed and then concentrated in urine — with very little remaining in blood or tissue — it's ideal for lower urinary tract infections and essentially useless for anything else (kidney infection, sepsis, skin infection). The FDA DailyMed label is the authoritative reference.
Two oral formulations are used for UTI: Macrobid (nitrofurantoin monohydrate/macrocrystals, 100 mg twice daily for 5 days) and Macrodantin (macrocrystals only, 50–100 mg four times daily for 7 days). Macrobid is prescribed more often because twice-daily dosing is easier to stick to. Both reach the same urinary concentrations and have similar cure rates. The Infectious Diseases Society of America (IDSA) guideline for uncomplicated cystitis lists nitrofurantoin as a first-line agent along with trimethoprim-sulfamethoxazole and fosfomycin.
You can be prescribed nitrofurantoin through Bidwell if you:
Men, children, pregnant patients near term, immunocompromised patients, and patients with any warning signs should be evaluated in person. The American Academy of Family Physicians supports telehealth UTI treatment for uncomplicated cystitis in otherwise healthy women.
Use caution and tell your provider if you have lung disease (rare but real risk of pulmonary toxicity with long-term use), liver disease (rare hepatotoxicity), peripheral neuropathy, or are taking long-term suppressive nitrofurantoin (not the 5-day course Bidwell prescribes). The NIH StatPearls monograph is a useful clinical reference.
| Formulation | Dose | Duration |
|---|---|---|
| Macrobid (monohydrate/macrocrystals) | 100 mg by mouth twice daily (morning and evening) | 5 days |
| Macrodantin (macrocrystals) | 50–100 mg by mouth four times daily | 7 days |
| Furadantin (microcrystals, liquid) | 5–7 mg/kg/day divided QID (rare adult use) | 7 days |
Most Bidwell UTI patients receive Macrobid 100 mg twice daily for 5 days, which is the standard adult regimen per the IDSA guideline. Take each dose with food — food substantially improves absorption and reduces the nausea that's the most common side effect. Space doses about 12 hours apart (e.g., 8 AM and 8 PM). Drink plenty of water while on the medication.
Finish the full course even if you feel better at 48 hours (you usually will). Stopping early increases the risk of recurrence and of selecting for resistant organisms. If symptoms don't improve by 48 hours or worsen, contact us — the infection may need different treatment.
Nitrofurantoin is generally well tolerated for the short courses used to treat UTI. Common side effects:
Rare but serious: pulmonary reactions (acute or chronic — cough, shortness of breath, fever), hepatotoxicity (uncommon with short courses; more associated with long-term suppressive use), peripheral neuropathy, hemolytic anemia in G6PD deficiency, severe allergic reactions. Stop the medication and contact a provider if you develop shortness of breath, new cough with fever, jaundice, or tingling/numbness.
Pulmonary reactions are very rare with 5-day courses and typically occur in patients on long-term suppressive therapy (months to years). Most 5-day UTI courses produce no serious side effects.
| Formulation | Quantity | Typical cash + discount |
|---|---|---|
| Nitrofurantoin mono/macro 100 mg (generic Macrobid) | 10 capsules (5-day course) | ~$10–$20 |
| Nitrofurantoin macrocrystals 100 mg (generic Macrodantin) | 28 capsules (7-day course) | ~$15–$30 |
| Macrobid (brand) | 10 capsules | ~$200–$300 |
Branded Macrobid is essentially never worth it — generic nitrofurantoin is therapeutically equivalent and costs 10–20× less. Check current prices at GoodRx. Some commercial insurance covers generic nitrofurantoin at a very low copay. Your $45 Bidwell visit covers the prescription and clinical review; the pharmacy fill is separate.
You must be physically located in one of these states at the time of your visit.
Yes. Uncomplicated UTI in non-pregnant adult women is routinely treated via telehealth. Bidwell reviews intakes same-day for $45 flat.
Macrobid 100 mg twice daily for 5 days is the standard. Macrodantin is 50–100 mg four times daily for 7 days. Take with food.
Per IDSA: low resistance, concentrates in urine, minimal collateral damage to the gut microbiome, inexpensive, and reliable for common UTI organisms (E. coli, S. saprophyticus).
Most women feel improvement within 24–48 hours. Burning eases first, then urgency and frequency. If you're not better by 48 hours or develop fever or flank pain, contact us.
Generally safe in the first and second trimesters but contraindicated at term (38–42 weeks). If pregnant, see your prenatal provider.
Nitrofurantoin isn't a sulfa drug. It's a preferred alternative to Bactrim for sulfa-allergic patients. Always disclose allergies before starting.
Generic Macrobid 5-day course: $10–$20 cash with GoodRx. The $45 Bidwell visit is separate from pharmacy fill.
No pharmacologic interaction (unlike metronidazole). But alcohol dehydrates and doesn't help UTI recovery — skip it while you're finishing the course.
Contact a provider or go to urgent care. Persistent symptoms suggest resistant organism or pyelonephritis; may need urine culture and different antibiotic.
Yes — brown or dark yellow urine is normal on nitrofurantoin and harmless. Resolves after stopping.