Odontogenic maxillary sinusitis is usually relieved by treating the dental disease. Antibiotics such as amoxicillin capsules and nasal mucosal constrictors such as ephedrine hydrochloride nasal drops can be taken if necessary. Due to the anatomical location of the posterior maxillary teeth in close proximity to the maxillary sinus, infections of the teeth such as periodontitis, apical periodontitis of the teeth, etc., bacteria will enter the maxillary sinus and cause maxillary sinusitis. Maxillary sinusitis can usually be relieved by treating the dental disease. If medication is needed, antibiotics such as amoxicillin capsules can be taken if necessary. You can also use nasal mucosal contraction agent such as ephedrine hydrochloride nasal drops to eliminate nasal mucosal congestion and swelling. However, the medication should be used under the guidance of a physician. It is recommended to consult a medical professional.