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Z-Pak is the common name for Zithromax, an antibiotic that treats infections. The doctor at the medical unit rejected the request, insisting that the staffer first receive an examination. The doctor was particularly concerned about serious cardiac issues that can result from taking Z-Pak. The staffer grew frustrated, this person recalled, and responded: moments later, another colleague walked past the doctor, grabbed the Z-Paks and handed them to the White House staffer.