of any efforts to recall such drug undertaken voluntarily by the person, including after a request under subsection (b). Except as provided in subsection (c), an informal hearing shall be held as soon as practicable, but not later than 5 calendar days, or less as determined by the Secretary, after such an appeal is filed, unless the parties jointly agree to an extension. After affording an opportunity for an informal hearing, the Secretary shall determine whether the order should be amended to require a recall of such drug. If, after providing an opportunity for such a hearing, the Secretary determines that inadequate grounds exist to support the actions required by the order, the Secretary shall vacate the order. (b) Emergency recall order (1) In general If the Secretary has credible evidence or information that a drug subject to an order under subsection (a) presents an imminent threat of serious adverse health consequences or death to humans, the Secretary may issue an order requiring any person who distributes such drug— (A) to immediately recall such drug