At the top of my head, I can think of the following instances:
blood drained in "Prophecy Girl" (only the drowning killed her);
sedated in "Out of Mind, Out of Sight";
drink spiked in "Reptile Boy";
cursed and scared in "Halloween";
hit on the head in "The Dark Age";
fainting sick in "Killed by Death";
sedated in "Killed by Death";
smothered with chloroform in "Gingerbread";
overwhelmed by mind reading in "Earshot";
blood drained in "Graduation Day, Part Two";
punched in "This Year's Girl";
hitting the head on a rock in "The Yoko Factor";
shocked with a cattle prod in "Crush";
falling under a spell in "Tabula Rasa";
poisoned in "Normal Again";
under surgery in "Villains";
and buried by rubble in "Bring on the Night."
