Nitrofurantoin (trade names Furadantin, Macrobid, Microdantina, and Macrodantinis) is an antibiotic drug. While it can fight a wide variety of infections, commonly used to fight urinary tract infections. The drug is considered reasonably safe during pregnancy by the FDA. It works by inhibiting the synthesis of protein in bacteria.

GoldBamboo

... NITROFURANTOIN (Furadantin®, Macrodantin®, Macrobid®) is an antibiotic. It is used to treat cystitis and other urinary tract infections. Generic nitrofurantoin tablets or capsules are available. ...
Drug Digest - more...

Nitrofurantoin Systematic (IUPAC) name 1-[(5-nitro-2-furyl)methyl ...
Wikipedia - [full article]

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