Anaphylaxis (rare, life-threatening allergic reaction) & hypersensitivity; dry mouth, dysgeusia, tooth discoloration; erythema. Benzydamine: Angioedema; drowsiness; dizziness, headache; bronchospasm, cough, laryngospasm; nausea, oral mucosal numbness or stinging sensation, retching, vomiting; photosensitivity, rash, pruritus, urticaria; thirst. Chlorhexidine: Ageusia, glossodynia, hypoesthesia, paresthesia; coated tongue, oral mucosal desquamation/swelling, tongue discoloration, gingivitis, glossitis, mucocele, sialadenosis, mouth irritation, parotid gland swelling; generalized allergic reactions.