To explore effective analgesics for pain in the anal -rectal region post operation

a pure TCM remedy

Guangtongxiao foam aerosol was developed which is a new therapeutic form. Through clinical observation and comparison between it and indomethacin

a western supporsitory

it yielded a satisfactory result

with a rapid analgesic effect （7. 05 + 0. 87min）

longer analgesic duration （5. 65 ± 1. 71 hr）

markedly superior to the controlled western remedy. Moreover

it also yielded mitigating actions on bleeding

difficult defecation

local thrombosis

edema

and congestion.