Thursday, December 23, 2010 Kristen, Community Member, asks

Q: How Long Does Lithium Stay In Your System

If my lithium dosage is decreased from 900mg to 600mg, how long before my blood levels will reflect that decrease? Also, what is a theraputic level?

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Answers (1)
Cort, Health Guide
12/24/10 1:08am

According to one doctor on the internet Lithium has a half life of 24 hours. He stated it takes about 5 half-lives for a drug to completely your system so it will take about 5 days to get to 600 mg. By the second day it should be at 750, then 675, 637, 618 etc. - so it gets down pretty quickly. 


Your doctor would have to determine what a good therapeutic level is...good luck! 

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By Kristen, Community Member— Last Modified: 04/07/14, First Published: 12/23/10