Nitrofurantoin
Also sold as Nitrofurantoin, NITROFURANTOIN
Medicine summary · from official FDA labels · Oct 19, 2026
What it’s used for
Nitrofurantoin oral suspension is indicated in adults and pediatric patients 1 month of age and older for the treatment of urinary tract infections due to susceptible strains of Escherichia coli, Enterococcus species , Staphylococcus aureus, Klebsiella species and Enterobacter species. Limitations of Use Nitrofurantoin oral suspension is not indicated for the treatment of pyelonephritis or perinephric abscesses [see Warnings and Precautions (5.
How to take it
Adult Patients: 50 mg to 100 mg four times a day - the lower dosage level is recommended for uncomplicated urinary tract infections. (2.
Important warnings
5 WARNINGS AND PRECAUTIONS • Hypersensitivity Reactions: Serious and occasionally fatal hypersensitivity (anaphylactic) reactions have been reported in patients receiving nitrofurantoin oral suspension. If signs and symptoms of a hypersensitivity reaction occurs, immediately discontinue nitrofurantoin oral suspension.
Common side effects
The following clinically significant adverse reactions are discussed in more detail in other sections of the labeling: • Hypersensitivity Reactions [see Warnings and Precautions (5. 1) ] • Pulmonary Reactions [see Warnings and Precautions (5.
Interactions
Antacids: Decreased absorption of nitrofurantoin.
If pregnant or breastfeeding
8.
Forms & strengths
25 MG / 75 MG Oral Capsule · 100 MG Oral Capsule · 100 MG Oral Tablet · 5 MG/ML Oral Suspension · 50 MG Oral Tablet · 25 MG Oral Capsule · 50 MG Oral Capsule · 10 MG/ML Oral Suspension
Questions to ask your doctor or pharmacist
- Is this the right medicine for my condition, and how long should I take it?
- What side effects should I watch for, and which need urgent attention?
- Does this interact with my other medicines, supplements, or alcohol?
- What should I do if I miss a dose or take too much?