Tussin cough syrups work by targeting the cause of the cough. Expectorants like guaifenesin loosen mucus, making it easier to clear. Suppressants like dextromethorphan reduce the urge to cough. Antihistamines and decongestants help if allergies or congestion are the cause. Some syrups also contain soothing agents like honey to coat the throat and reduce irritation.
