• Infiltration anesthesia: Injecting the solution directly into the tissue at the site of a minor surgery or wound to numb the immediate area.
• Nerve blocks: Injecting near specific nerves (e.g., dental blocks, brachial plexus) to desensitize a larger region of the body for procedures like dental extractions or limb surgeries.
• Epidural/Spinal anesthesia: Injecting into the epidural space (lumbar or caudal) to provide pain relief and anesthesia for procedures involving the caudal abdomen, pelvis, or hind limbs. 

ADMINISTRATION

• Local Infiltration (Line Blocks/Field Blocks): Lidocaine is injected subcutaneously (under the skin) along the planned incision site to numb the immediate area.
  • Technique: The anesthetic is injected slowly as the needle is withdrawn to distribute it throughout the tissue. This creates a “line block” or “field block” for minor procedures.
  • Concentration: A 0.5% concentration is often used, sometimes diluted from a 2% solution.
• Nerve Blocks: A more targeted approach where lidocaine is injected near specific nerves to desensitize a larger region of the body, such as a limb or part of the head (e.g., dental blocks, cornual blocks for dehorning).
  • Technique: The needle is guided to the vicinity of the nerve using anatomical landmarks or nerve stimulators. Aspiration is crucial before injection to prevent accidental intravascular administration.
• Epidural (Neuraxial) Injection: Lidocaine is injected into the epidural space around the spinal nerves, typically in the lumbosacral or sacrococcygeal region. This provides regional anesthesia for the caudal abdomen, hind limbs, and perineum.
  • Technique: The “hanging drop technique” is often used to confirm correct needle placement in the negative-pressure epidural space. The drug is administered slowly to avoid excessive cranial spread, which can cause complications like hypotension.
• Intravenous (IV) Administration: This method is used for systemic analgesia (pain control throughout the body), especially during and after surgery, and to treat certain types of abnormal heart rhythms (ventricular arrhythmias).
  • Technique: It is typically administered as a slow initial bolus (loading dose) followed by a continuous rate infusion (CRI) using a syringe pump to ensure a steady and safe dose. Rapid IV injection can be toxic..