**Question 20** *A 7-year-old, 45 kg female presents to your office with dysuria. Her urinalysis shows 2+ leukocytes, positive nitrate, and small blood. Her urine culture is pending, but you are highly suspicious of a possible urinary tract infection (UTI). You order the urine culture as well as:* - Augmentin 600/5, s/g: Take 7 ml po bid x 10 days - **Omnicef 250/5, s/g: Take 6 ml po bid x 10 days** - Macrodantin 50 mg q 6 hours x 5 days - Zithromax 200/5, take 12 ml po day 1, then 6 ml po days 2-5 **Explanation:** Among the choices, **Omnicef (cefdinir) 250/5, 6 ml po bid x 10 days** is commonly used for pediatric UTIs, especially if there is a penicillin allergy or concern for resistance. The dosing is appropriate for the patient's weight. The other options are either not first-line for UTI or have incorrect dosing/duration for pediatric UTI. **Correct answer:** **Omnicef 250/5, s/g: Take 6 ml po bid x 10 days**