According to Drugs.com, Macrobid is not expected to be harmful during early pregnancy. However, do not use this medication in the last two to four weeks of pregnancy. Breastfeeding while taking Macrobid may be harmful because it is possible for the drug to pass into breast milk.
According to Drugs.com, do not use Macrobid while breastfeeding a baby that is less than one month old. Patients with severe kidney disease, urination difficulties or liver problems are instructed not to use Macrobid because of potential complications.
This drug, whose generic name is nitrofurantoin, is an antibiotic used to treat urinary tract infections. According to WebMD, Macrobid is not intended for infections outside the bladder, such as kidney infections. As always, consult a doctor about the proper use of prescription medications.