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Pauline, Doctor (MD)
Category: Health
Satisfied Customers: 8631
Experience:  Medical Doctor & Registered Pharmacist. Worked as Community pharmacist for 17 years.
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how long dose lidocaine injection stay in the blood stream

Customer Question

i want to know after given an injection or two of lidocaine how long dose it stay in the human body not how long it works to numb pain
Submitted: 9 years ago.
Category: Health
Expert:  Pauline replied 9 years ago.

Where was the lidocaine injected? Do you know how much?

What the injection for?

Can I ask the reason for the question?

Customer: replied 9 years ago.
Reply to Pauline's Post: lidocaine was injected in the mouth. unsure of the exact dosage, was used for a dental procedure, was curious as to long long the lidocaine remains in the body after the numbing affect wears off i do know that twwo injections of lidocaine were given as well as the lidocaine gel was applied
Expert:  Pauline replied 9 years ago.

Absorption of lidocaine depends on site of injection, and half life is also variable as the lidocaine is extensively metabolized quite quickly but the metabolites will have a longer half life.

If you were to assume that all lidocaine was out of the body in a couple of days,and the active metabolites perhaps a few days longer that would be a good approximation. Things that affect this include body weight and water content, as well as renal and liver function.

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