Wiktionary(0.00 / 0 votes)Rate these synonyms: 1  filter(noun) Synonyms: 2  filter(noun) To sort, sift, or isolate. 3  filter(noun) To diffuse; to cause to be less concentrated or focused. 4  filter(noun) To pass through a filter or to act as though passing through a filter. 5  filter(noun) To move slowly or gradually; to come or go a few at a time.
Macrobid (nitrofurantoin monohydrate/macrocrystals) Capsules. 1  To reduce the development of drug-resistant bacteria and maintain the effectiveness of Macrobid and other antibacterial drugs, Macrobid should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.
Nitrofurantoin, sold under the trade name Macrobid among others, is an antibiotic used to treat bladder infections. It is not effective for kidney infections. It is taken by mouth. Common side effects include nausea, loss of appetite, diarrhea, and headaches.he most common side effects with nitrofurantoin are nausea, headache, and flatulence. Less common adverse events (occurring in less than 1% of those taking the drug) include: 1  Gastrointestinal: diarrhea, dyspepsia, abdominal pain, constipation, emesis. 2  Neurologic: dizziness, drowsiness, amblyopia.