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Dr. Cameron
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Experience:  American Board Certified in Emergency Medicine and Ivy League trained
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How does it take for haldol decanoate to leave thesystem

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how long does it take for haldol decanoate to leave thesystem (150 mg injection)
As you know- Haloperidol decanoate is the long-acting form of haloperidol. The basic effects of haloperidol decanoate similar to those of haloperidol with the exception of duration of action.
The half life is 3 weeks of the medication. After 3 half lives, the medication is pretty much gone- so this is 9 weeks. This makes sense considering that the dosing schedule is every 4 weeks...

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