2007-02-07 10:20:12 · 3 answers · asked by deb5046us 1 in Health ➔ Dental
The half-life of lidocaine (the most common "novacaine" used in dentistry) is only 1.5-2 hours. This means half will be excreted in the urine after about 2 hours. Another half in another 2 hours, etc., so it is gone pretty quickly.
Some people ask this question when they are about to take a drug test. Injectable local anesthetics will not give a positive reaction that would be mistaken for cocaine. If you are extremely concerned about this, ask for a note from your dentist. If this is not your concern, then please ignore this paragraph and accept my apology for giving too much information. I'm just trying to anticipate your need...
2007-02-07 11:11:13 · answer #1 · answered by Jess 5 · 1⤊ 0⤋
First of all they dont use novacaine anymore. It is other anesthesias. They can last for a few hours but in rare conditions some people can suffer permanent numbness.
2007-02-07 11:40:07 · answer #2 · answered by Educated 7 · 0⤊ 0⤋
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2016-05-07 14:20:24 · answer #3 · answered by Anonymous · 0⤊ 0⤋