Macrodantin

Nitrofurantoin is an antibiotic. It is usually used in treating urinary tract infection.
See more at Wikipedia.org...

Mac·ro·dan·tin A trademark for the drug nitrofurantoin. nitrofurantoin macrocrystals Macrobid, Macrodantin Pharmacologic class: 5-nitrofuran [more]Macrodantin - Community and Resources

Noun
1. derivative of nitrofuran used as an antibacterial medicine (trade name Macrodantin) effective against a broad range of Gram-positive and Gram-negative bacteria; used to treat infections of the urinary tract
(synonym) nitrofurantoin
(hypernym) antibacterial, antibacterial drug, bactericide
(substance-meronym) nitrofuran
(classification) trade name, brand name, brand, marque