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A comparison of cocaine and 'co-phenylcaine' local anaesthesia in flexible nasendoscopy.

Cocaine is widely used as a local anaesthetic in the nose. However, it is potentially toxic, a known drug of addiction, and its spray delivery devices can theoretically transfer infection. This two-part study investigates a less toxic alternative, 5% lidocaine and 0.5% phenylephrine ('co-phenylcaine') solution, presented in a disposable spray. In the first part, the efficacy of co-phenylcaine was assessed in 25 healthy volunteers. Serial acoustic rhinometry showed a significant, sustained nasal decongestion after co-phenylcaine administration. Visual analogue scale (VAS) scores in response to a painful nasal stimulus confirmed a significant anaesthetic effect. In the second part, co-phenylcaine was compared with 10% cocaine spray in a randomized double-blind trial in 74 patients undergoing out-patient transnasal fibrescopic laryngoscopy. VAS pain ratings and nasal inspiratory peak flow recordings showed no difference between the two solutions. No adverse effects were noted. It is concluded that co-phenylcaine is an excellent alternative to cocaine nasal spray.