(This measure has not been amended since it was introduced. The summary has been expanded because action occurred on the measure.) Medical Preparedness Allowable Use Act (Sec. 2) This bill amends the Homeland Security Act of 2002 to authorize the use of Urban Area Security Initiative and State Homeland Security Grant Program funding for enhancing medical preparedness, medical surge capacity, and mass prophylaxis capabilities, including the development and maintenance of an initial pharmaceutical stockpile, including medical kits, and diagnostics sufficient to protect first responders, their families, immediate victims, and vulnerable populations from a chemical or biological event.