The profusion of lidocaine is a treatment by which a local anesthetic (lidocaine) intravenously to cause pain blocking the particular area you want treated is supplied. A catheter inserted through a vein in the analgesic is administered for about 60 or 90 minutes, while heart rate and blood pressure is controlled, as this drug may cause cardiac abnormalities. The action of lidocaine is blocking nerve transmission of pain to the brain preventing pain signals. This treatment is particularly suitable to treat post-herpetic pain and pain associated with fibromyalgia.