First-Line Treatment for Symptomatic Cystitis in First Trimester Pregnancy

Recommended First-Line Antibiotic

• Cephalosporins like cefadroxil (500 mg twice daily for 3 days) are appropriate alternatives for uncomplicated cystitis in first trimester pregnancy when local E. coli resistance is <20% 1, 2

Antibiotics to Avoid in First Trimester

• Trimethoprim and trimethoprim-sulfamethoxazole are contraindicated in the first trimester due to teratogenic concerns 1, 2

Alternative Options When Cephalosporins Cannot Be Used

• Fosfomycin trometamol (3 g single dose) may be considered as an alternative for uncomplicated cystitis in women, though specific first-trimester pregnancy safety data is limited 1, 2, 3

Treatment Duration and Monitoring

• Obtain urine culture before initiating treatment in all pregnant women with suspected cystitis, as this is a specific indication for pre-treatment culture 2, 4
• Perform antimicrobial susceptibility testing to guide therapy selection 2