▁spite ▁of ▁it ▁all ." ▁ ▁Review ▁D ifferent ▁World s ▁# 3 1 ▁ ▁References ▁ ▁Category : S cience ▁fiction ▁role - play ing ▁game ▁supp lement s <0x0A> </s> ▁An ▁or phan ▁drug ▁is ▁a ▁ph arma ce ut ical ▁agent ▁developed ▁to ▁treat ▁medical ▁conditions ▁which , ▁because ▁they ▁are ▁so ▁rare , ▁would ▁not ▁be ▁prof itable ▁to ▁produce ▁without ▁government ▁assistance . ▁The ▁conditions ▁are ▁referred ▁to ▁as ▁or phan ▁dise ases . ▁ ▁The ▁assignment ▁of ▁or phan ▁status ▁to ▁a ▁disease ▁and ▁to ▁dru gs ▁developed ▁to ▁treat ▁it ▁is ▁a ▁matter ▁of ▁public ▁policy ▁in ▁many ▁countries ▁and ▁has ▁yield ed ▁medical ▁break through s ▁that ▁might ▁not ▁otherwise ▁have ▁been ▁achieved , ▁due ▁to ▁the ▁econom ics ▁of ▁drug ▁research ▁and ▁development . ▁ ▁In ▁the ▁U . S . ▁and ▁the ▁EU , ▁it ▁is ▁easier ▁to ▁gain ▁market ing ▁appro val ▁for ▁an ▁or phan ▁drug . ▁There ▁may ▁be ▁other ▁financial ▁in cent ives , ▁such ▁as ▁an ▁extended ▁period ▁of ▁exclus ivity , ▁during ▁which ▁the ▁producer ▁has ▁sole ▁rights ▁to ▁market ▁the ▁drug . ▁All ▁are ▁intended ▁to ▁encou rage ▁development ▁of ▁dru gs ▁which ▁would ▁otherwise ▁lack ▁sufficient ▁profit ▁mot ive ▁to ▁attract ▁corpor ate ▁research ▁bud gets ▁and ▁personnel . ▁ ▁Definition ▁According ▁to ▁the ▁US ▁Food ▁and ▁D rug ▁Administration ▁( F DA ), ▁an ▁or phan ▁drug ▁is ▁defined ▁as ▁one ▁" int ended ▁for ▁the ▁treatment , ▁prevent ion ▁or ▁diagn osis ▁of