Ricky it takes approximately 5 half-lives for a drug to clear the system. 
If the drug you are looking up has a half-life of, say, 4 hours, then 20 
hours after taking the last dose the levels should be undetectable.
Regarding this mother and her unique situation though I would be inclined 
to speak with Dr Hale and her oncologist.

Good luck
Keep us informed how she gets on.
Denise

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Denise Fisher
Health e-Learning
http://www.health-e-learning.com
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