Changes

===Central Nervous System===

===Central Nervous System===

*Shown to be an N-methyl-D-aspartate receptor anatagonist, and so may reduce the development of enhanced pain sensitivity.

*Shown to be an N-methyl-D-aspartate receptor anatagonist, and so may reduce the development of enhanced pain sensitivity.

*Increases intracrainal pressure

*Increases intracranial pressure

===Cardiovascular System===

===Cardiovascular System===