Doxycycline is not usually a first-choice antibiotic for urinary tract infections, but if your doctor has prescribed it for your UTI, the adult dosage is generally 100 mg taken by mouth twice a day. In many cases, this regimen is followed for about 7 days, though the exact course length or adjustments to the dose depend on factors like the severity of the infection and your personal health.
Because doxycycline does not concentrate as well in the urine as some other antibiotics (for example, trimethoprim-sulfamethoxazole), it may be prescribed only when the bacteria causing your UTI are known to be susceptible to doxycycline or if other treatments cannot be used. The decision to use doxycycline for a UTI is usually based on urine culture results and a review of your medical history.
It’s important to follow your doctor’s instructions carefully and complete the full course of treatment. If you have any concerns about the dosage or if your symptoms do not improve, get in touch with your doctor for further guidance.
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