If maxillary sinusitis does not improve after taking antibiotics and corticosteroids, it may indicate chronic or resistant infection, inadequate sinus drainage, or an underlying allergic or structural cause. The next step is to consult an ENT specialist for a thorough examination, including a nasal endoscopy or CT scan of the sinuses, to identify the exact cause. Treatment options may include nasal saline irrigation, topical nasal corticosteroid sprays to reduce inflammation, and adjusted antibiotic therapy based on culture results. If medical therapy fails, a minor surgical procedure, such as functional endoscopic sinus surgery (FESS), may be required to improve sinus drainage and ventilation. It is vital to avoid self-medication or repeated antibiotic use without medical supervision, as this can worsen resistance and delay recovery.