To Arly Helm Re: metronidazole prescribing. Per your question: >At what age/weight would a physician prescribe Flagyl for a child? At present there are no FDA approved pediatric indications that I know of. However, The Harriet Lane Handbook(Pediatric) lists doses varying from 15-35 mg/kg/24 hrs depending on the source of infection. Nelson's Pocket Book of Pediatric Antimicrobial Therapy lists a dose of 15 mg/kg/24 hrs(dividied q 8 hrs) for 5 days for therapy of giardiasis. So to answer your question, although not FDA approved, it is commonly used in pediatric NICU's and PICU's at almost all ages. Tom Hale