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WARNING: Snorting methylphenidate (Ritalin, Concerta) can cause cardiac arrest.

The problem with that is, there are no such studies on this. So maybe, you should think twice before attempting such a risky experiment.

Maybe the fatal dose is 72mg; maybe it's 3mg. I'm a doctor and I have not the faintest idea. Why don't you call a medical examiner and ask. You'll break the ice with him; so there won't be any sexual tension before he gets to look at you through a Y incision.

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Q: How much Concerta is a lethal dose if snorted?
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