INDICATIONS AND USAGE: Dyclonine HCl Topical Solution, USP is indicated for anesthetizing accessible mucous membranes (e.g., the mouth, pharynx, larynx, trachea, esophagus, and urethra) prior to various endoscopic procedures.

Dyclonine HCl Topical Solution, USP, 0.5% topical anesthetic may also be used to block the gag reflex, to relieve the pain of oral ulcers or stomatitis and to relieve pain associated with ano-genital lesions.

WARNINGS: IN ORDER TO MANAGE POSSIBLE ADVERSE REACTIONS, RESUSCITATIVE EQUIPMENT, OXYGEN AND OTHER RESUSCITATIVE DRUGS SHOULD BE IMMEDIATELY AVAILABLE WHENEVER LOCAL ANESTHETIC AGENTS, SUCH AS DYCLONINE, ARE ADMINISTERED TO MUCOUS MEMBRANES.

Dyclonine HCl Topical Solution, USP should not be injected into tissue or used in the eyes because of highly irritant properties.

Dyclonine HCl Topical Solution, USP should be used with extreme caution in the presence of sepsis or severely traumatized mucosa in the area of application since under such conditions there is the potential for rapid systemic absorption.

ADVERSE REACTIONS: Adverse experiences following the administration of dyclonine are similar in nature to those observed with other local anesthetic agents.

These adverse experiences are, in general, dose-related and may result from high plasma levels caused by excessive dosage or rapid absorption, or may result from a hypersensitivity, idiosyncrasy or diminished tolerance on the part of the patient.

Serious adverse experiences are generally systemic in nature.

The following types are those most commonly reported: Central nervous system: CNS manifestations are excitatory and/or depressant and may be characterized by lightheadedness, nervousness, apprehension, euphoria, confusion, dizziness, drowsiness, tinnitus, blurred or double vision, vomiting, sensations of heat, cold or numbness, twitching, tremors, convulsions, unconsciousness, respiratory depression and arrest.

The excitatory manifestations may be very brief or may not occur at all, in which case the first manifestation of toxicity may be drowsiness merging into unconsciousness and respiratory arrest.

Drowsiness following the administration of dyclonine is usually an early sign of a high blood level of the drug and may occur as a consequence of rapid absorption.

Cardiovascular system: Cardiovascular manifestations are usually depressant and are characterized by bradycardia, hypotension, and cardiovascular collapse, which may lead to cardiac arrest.

Allergic: Allergic reactions are characterized by cutaneous lesions, urticaria, edema or anaphylactoid reactions.

Allergic reactions may occur as a result of sensitivity either to the local anesthetic agent or to the other ingredients used in this formulation.

Allergic reactions, if they occur, should be managed by conventional means.

The detection of sensitivity by skin testing is of doubtful value.

Local reactions include irritation, stinging, urethritis with and without bleeding.