Definitely the most common complications are infections, dural puncture, hemorrhage and damage of the nearby nerves. Infections can be more or less serious. A dural puncture is usually followed by headache. The headache occurs after the drug administration and is also known as spinal headache. It is present for a few days and then it withdraws. If the headache does not go away after a few days a blood patch may be required. A blood patch is actually a procedure in which the blood is taken from the patient and then injected into the epidural space. What follows is clot formation and the clot will stop the leak. Hemorrhage is a complication that usually affects patients who have already been suffering from coagulopathies. The spinal nerves can be damaged either directly by the needle or indirectly by consequent infection or hemorrhage.
Adverse experiences following the administration of lidocaine HCl are similar in nature to those observed with other amide local anesthetic agents. These adverse experiences are, in general, dose-related and may result from high plasma levels caused by excessive dosage, rapid absorption or inadvertent intravascular injection, 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: