Probably the closest iOS game I can find to Dr Mario... And thats great, but it has some bugs. Exiting the app and coming back doesnt save your progress properly. The swiping doesnt always detect which makes you place the pills wrong inadvertently. Also, the game gets to a point where you just seem to be playing the same thing over and over even though the levels advance.
halfofbob about Flu Fighter, v2.0.5