An overdose of local anesthetic can have serious consequences. Average doses may cause some patients to have weakness in their legs or dizziness. Tablets and liquids cause less discomfort than injections into muscle or skin, but they can work just as well. They are inexpensive, simple to give, and easy to use at home. The injection site is usually painful for a short time.
Medicines given by injection are more expensive than tablets or liquids and take time to wear off.
Pain relief may be delayed while you ask the nurse for medicine and wait for the shot to be drawn up and given. The tip of the tube stays in the vein. Medicines given by injection into a vein are fully absorbed and act quickly. This method is well suited for relief of brief episodes of pain. A small tube must be inserted in a vein.