Medication Summary
The goals of pharmacotherapy are to eradicate the infection, reduce morbidity, and prevent complications. Agents used include antibiotics and analgesics.
Antibiotics
Nitrofurantoin (Furadantin, Macrobid, Macrodantin)
Nitrofurantoin is a synthetic nitrofuran that interferes with bacterial carbohydrate metabolism by inhibiting acetylcoenzyme A. It is bacteriostatic at low concentrations (5-10 mcg/mL) and bactericidal at higher concentrations. It is bactericidal against uropathogens such as Staphylococcus saprophyticus, Enterococcus faecalis, and Escherichia coli; it possesses no activity against Proteus, Serratia, or Pseudomonas species. It received a “A-I” rating in the 2011 IDSA guidelines for treating UTIs.
It is manufactured in different forms to facilitate durable urine concentrations: macrocrystals (Macrodantin), microcrystal suspension (Furadantin), and a combined preparation (Macrobid). This agent achieves no appreciable concentrations in the prostate, kidney, or blood. Administer 100 mg orally twice daily for 5-7 days.
Cephalexin (Keflex)
This is a first-generation cephalosporin that inhibits bacterial growth by inhibiting bacterial cell wall synthesis. It is bactericidal and effective against rapidly growing organisms forming cell walls. Administer 500 mg orally every six hours for 5-7 days.
Amoxicillin and clavulanate (Augmentin, Amoclan)
Amoxicillin interferes with the synthesis of cell wall mucopeptides during active multiplication, resulting in bactericidal activity against susceptible bacteria. This drug combination treats bacteria normally resistant to beta-lactam antibiotics. Administer 500/125 mg orally every 8 hours for 5-7 days. An alternative dosing is 875/125 mg twice daily for 5-7 days.
Amoxicillin (Moxatag)
Amoxicillin interferes with synthesis of cell wall mucopeptides during active multiplication, resulting in bactericidal activity against susceptible bacteria. Administer 500 mg orally every eight hours for 5-7 days. This should not be used for empiric treatment given its poor efficacy.
Cefuroxime (Ceftin, Zinacef)
Cefuroxime is a second-generation cephalosporin that maintains the gram-positive activity of first-generation cephalosporins; it adds activity against Proteus mirabilis, Haemophilus influenzae, Escherichia coli, Klebsiella pneumoniae, and Moraxella catarrhalis. Administer 250 mg orally twice daily for 3-7 days
Fosfomycin (Monurol)
Fosfomycin was given a "B, I" rating in the 1999 IDSA guidelines for treating UTIs. Phosphonic acid is a bactericidal agent active against most UTI pathogens, including Escherichia coli and Enterobacter, Klebsiella, and Enterococcus species. Little cross-resistance between fosfomycin and other antibacterial agents exists. It is primarily excreted unchanged in the urine, and concentrations remain high for 24-48 hours after a single dose. It is unique but quite expensive. Administer 3 g orally as single dose with 3-4 oz of water
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Twenty-nine-year-old pregnant woman with history of reflux uropathy and ureteral reimplantation at age 21 months presents with right-side flank pain and proteinuria. Renal cortical thinning suggests chronic hydronephrosis.
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Color-flow Doppler highlights normal flow in right kidney of 29-year-old pregnant woman with history of reflux uropathy and ureteral reimplantation at age 21 months who presents with right-side flank pain and proteinuria.
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25-year-old pregnant woman with right lower quadrant pain and hematuria has proximal ureteral obstruction consistent with urolithiasis. After 25 minutes, intravenous pyelography reveals dense right nephrogram and no filling of right collecting system. Left side shows unremarkable nonhydronephrotic collecting system. This is consistent with right ureteral lithiasis.
Tables
Table 1. Treatment Regimens for Pregnant Women with Asymptomatic Bacteruria or UTI |
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