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It's probably easier to find in blood because it's a long-acting drug that isn't excreted in the urine, like most drugs.
Despite her use of the long-acting drug preparation, she reported that the carbidopa-levodopa effect wore off after 3 to 4 hours.
A single injection of a long-acting steroid such as triamcinolone (eg Kenalog) can bring symptoms under control quickly.
In the past, manufacturers of long-acting narcotics have marketed these products aggressively without underscoring their addictive risk.
The AAP does not recommend routine use of pemoline, a long-acting stimulant, because of rare but potentially fatal hepatotoxicity.
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