Use with caution in infection or traumatized mucosa in the area of application, in order to avoid rapid systemic absorption. Use with caution in shock or heart block. Use with caution in known allergy to dyclonine. Possible hypersensitivity reactions to anesthetics (e.g. cutaneous lesions, urticaria, swelling, and edema). Sensitization occurs rarely. Systemic toxicity, including adverse CNS and cardiovascular effects, may occur (with excessive dosage or rapid absorption of the drug). Systemic (e.g. CNS, cardiovascular) effects possible with excessive dosage or rapid absorption. May impair swallowing and enhance danger of aspiration (with topical administration).