Ketamine is administered over a period of 40 minutes. The dose is determined by your weight. The amount of ketamine administered is not enough to cause a loss of consciousness, so you will remain awake. During the infusion, some patients experience odd perceptions—like seeing bright colors. Some report what is referred to as a “dissociative”, or “out of body” experience. These are side effects of ketamine that may be important for ketamine’s ultimate effectiveness. Most patients tolerate the experiences with no trouble, and many people find them pleasant. Once the infusion is complete, the dissociative effects of the drug rapidly dissipate. There are no delayed “flashbacks,” and patients generally leave the office within 30 minutes following the infusion and feel quite normal.