WASHINGTON — The head of the Food and Drug Administration's drug center abruptly resigned Sunday after federal officials began reviewing "serious concerns about his personal conduct," according to a government spokesperson.

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The head of the Food and Drug Administration's drug center abruptly resigned Sunday amid concerns about his personal conduct

A federal spokesperson said Dr. George Tidmarsh left the agency after federal lawyers began looking into "serious concerns about his personal conduct," according to an official statement

Tidmarsh had been serving as the FDA's top regulator since July

His resignation came the same day that a drugmaker filed a lawsuit against him alleging "false and defamatory statements" about its products

The drugmaker, Aurinia Pharmace

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