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Should my mother-in-law stop taking Bactrim since Thursday night to treat a urinary infection as she has been experiencing muscle pain, stiffness in her neck, and headaches since then?

Yes, if your mother-in-law is experiencing muscle pain, neck stiffness, and headaches after taking Bactrim for a urinary tract infection, she should stop taking the antibiotic and contact her pharmacist immediately. In some cases, Bactrim can be effective for treating a urinary infection within a 3-day period. The pharmacist will be able to advise on whether she should discontinue the antibiotic or switch to a different one.