Inhaled corticosteroids and other asthma medications help reduce airway inflammation, which can improve both allergy symptoms and sleep quality. However, certain first-generation antihistamines used for allergy — such as chlorpheniramine — cause sedation that worsens sleep apnea by over-relaxing the throat muscles. Dr. Dixit Kumar Thakur at PulmoVista Clinics reviews all asthma medications and allergy treatments in the context of each patient’s sleep disorder to ensure they work together safely.