A flight carrying medical specialists and essential supplies is due to leave the Amberley RAAF base, west of Brisbane, at 11am (AEST) today.
The doctors, nurses, paramedics and support workers, drawn from across Australia, are expected to remain in the stricken country for about a month to help deal with worsening health crises linked to the floods.
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Torrential monsoon rains have triggered massive floods that have moved steadily from north to south over the past month, engulfing a fifth of the country and affecting 17 million of its 167 million people.
The Pakistani government has been overwhelmed by the magnitude of the disaster, the worst in the country's history, with millions in need of tents, food and medical aid.
Aid agencies are worried about the growing danger of malnutrition and water-borne disease. Eight million people have been left dependent on aid.
"As the floodwaters begin to recede we are hearing reports of things like cholera and dysentery beginning to emerge," AusAID's Suzanne Edgecombe told the ABC.
