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You are correct--these side effects are possible with Lidocaine. Please see the following website under Lidocaine Side Effects for the Professional. It lists vomiting and central nervous system effects (which could be mental status changes and tinnitus) as possible side effects. If the effects get worse, go to the emergency room and get checked out.
The link for the "lidocaine side effects for the professional" site did not come across. The specific information i was seeking is related to how long after a dose of lidocaine i should expect these side effects to last.
As long as you don't have any liver or heart conditions, about half of the lidocaine will be eliminated from the body in 2 hours, and will be nearly completely eliminated within 10 hours. However, if the side effects are severe, and not improving over 10 hours, then you need to go to the emergency room. If you've got breathing problems, go to the emergency room right away.