While Cefixime 200 mg is an effective antibiotic, it is generally not the first-line choice for treating chronic sinusitis. Chronic sinusitis is often inflammatory or allergic, rather than purely bacterial. Even when bacterial, other targeted antibiotics are typically preferred because they more effectively target the specific bacteria involved in sinus infections. Self-treating with this medication may not resolve your symptoms and can lead to antibiotic resistance. I highly recommend consulting an ENT specialist or your doctor. They can properly evaluate your sinuses and prescribe the correct treatment, which may include targeted nasal sprays, allergy medications, or a more appropriate antibiotic.