https://www.medicalnewstoday.com/articles/320409.php
."What you should know about date rape drugs

.......

Ketamine is an anesthetic that acts quickly to cause feelings of relaxation. Victims may lose consciousness or be confused and compliant. They might not remember what happened while under the influence of the drug.

Unlike most other date rape drugs, ketamine acts almost immediately. A victim may not have time to realize they have been drugged.

At high doses, ketamine can cause breathing problems that may be fatal.

Ketamine comes as a white powder that may change the taste of someone's drink. Consequently, perpetrators sometimes use it in strong-tasting alcoholic beverages that may disguise the drug's presence."....(more)