 Perineal pain after childbirth appears in most of the women with or without episiotomy. Mac Arthur Am J Obst. Gynecol. 2004. This perineal pain can become source of chronic pain in 9-12 of the cases. Neostigmine, a cholinesterase inhibitor at the dose of 500μg, combined with Sufentanil or Ropivacaine local anaesthetic has an analgesic effect. 