How Many Milligrams of Flexeril Is Considered a Lethal Dose?

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The FDA has not specified how much Flexeril is a lethal dose for humans, explains Drugs.com. The lethal dose of Flexeril in mice is 338 milligrams per kilogram. The FDA has determined the recommended dosing for most adults to be 5 milligrams or 10 milligrams up to three times daily.

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