How Long Do Antibiotics Take to Work for a UTI?

Antibiotics for UTIs typically begin working within 24-48 hours, with most symptoms improving significantly by day 2-3. Studies show that 80% of patients experience symptom relief within 48 hours of starting treatment. Simple UTIs usually require 3-7 days of antibiotic treatment, while complicated infections may need 7-14 days. Pain and burning during urination often improve first, followed by reduced frequency and urgency. Complete the full antibiotic course even if symptoms disappear early to prevent recurrence and antibiotic resistance. If symptoms don't improve after 48-72 hours or worsen, contact your healthcare provider as you may need a different antibiotic or further evaluation.