It is a painkilling drug but also has hallucinogenic effects. It is chemically produced. It is used as an anaesthetic by vets. It was used for humans until patients reported unwanted visions whilst under its influence. Possession is not illegal, but supply is.. Known As: Special K, Vitamin K, K. Looks Like: In its legal form it is an injectable liquid, and can only be legally obtained on prescription. When produced illegally, it comes as tablets, or as a powder. Apparent Positive Effects: Speedy rush which leads to powerful hallucinations, and out of the body experiences. Changes perceptions, for example of music and lights. Overall feeling of numbness. The Downside: Can bring on a feeling of being paralysed - you may not be able to move at all. Can cause slurred speech. Some people are physically sick. It is very strong and its effects are unpredictable and confusing. Because it is an anaesthetic, you can hurt yourself and not know until the following day. Ketamine should not be taken with anything else, particularly alcohol, barbiturates or valium Large doses can lead to unconsciousness, breathing difficulties and heart failure. It has been used as a date-rape drug. The long-term effects of ketamine are not known, although some tests show that users have impaired memory and mild schizophrenia.