Our expert says:
Purbac is an entry level antibiotic to treat cystitis (a bladder infection). Hopefully your doctor will have tested the urine to see if the bacteria (usually an E Coli)is sensitive to Purbac (also called Trimethoprim). If you have chronic cystitis, nitrofurantoin may be a better antibiotic to take. Most medications can cause headaches and this isn't an allergic reaction. Please discuss your symptoms and non-response to treatment with your GP.
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