How to use Macrobid. Take this medication by mouth with food as directed by your doctor, usually twice daily (every 12 hours). Swallow the medication whole for best results. These images are a random sampling from a Bing search on the term Nitrofurantoin. Click on the image (or right click) to open the source website in a new browser window. Nitrofurantoin (Macrodantin, Furadantin, Macrobid) is a prescription antibiotic used to treat urinary tract infections. Nitrofurantoin is available in three forms, Macrodantin, Furadantin, and Macrobid. Common side effects are change in urine color, diarrhea, itching, and headache. Pregnancy and breastfeeding safety information are provided. NITROFURANTOIN is an antibiotic. It is used to treat urinary tract infections. The lowest GoodRx price for the most common version of nitrofurantoin mono/macro is around $17.71, 67% off the average retail price of $54.99. Nitrofurantoin Capsules official prescribing information for healthcare professionals. Includes: indications, dosage, adverse reactions, pharmacology and more. The active substance is 100mg nitrofurantoin in each capsule. The other ingredients are talc, corn starch, lactose, carbopol, povidone, sugar and magnesium stearate. The capsule shell contains Nitrofurantoin can cause unusual results with certain lab tests for glucose (sugar) in the urine. Tell any doctor who treats you that you are using nitrofurantoin. Tell any doctor who treats you that you are using nitrofurantoin. Macrobid is a revolutionary treatment, which is classified as an antibiotic, which fights body bacteria improving the current health state. The drug contains Nitrofurantoin as an active component, which helps to achieve the desired effects. Learn about Macrobid (Nitrofurantoin) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications. Nitrofurantoin can pass into breast milk and may harm a nursing baby. You should not breast-feed while you are taking this medicine. Nitrofurantoin should not be given to a child younger than 1 month old.