Ketamine does not suppress the respatory or cardiac systems and as such is also used in our hospitals for the treatment of children and adults who are allergic to other tranqs.
Ketamine is one of the only physically addictive hollucinagens, so care should be taken to prevent a regular habit.
Ket is usually supplied as a white powder, and is ingested via the nose (snorting).
It is important to note at this stage that Ket produces a foul tasting acidic drip in the back of the throat when snorted, and as such most heavy users prefer to spit when on ket, rather than risk an upset stomach in the morning. For small quantities, a flavoured drink will suffice to wash out the taste.
The effects of ket are i think best discribed as being drunk but without the bad parts. Relaxed in body and mind, and unable to perform any task at the normal rate :P.
Larger doses will induce near anesthesia, also known as a "K Hole", in which users will be completely seperated in mind and body. A K Hole has been discribed to me as both an out of body experience and a complete understanding of ones own inner process. Most of the effects of Ketamine will wear off whithin 3 to 4 hours of ingestion, although it's worth noting that a general sense of spaced-ness will persist after a heavy dose/session.
Prices in the UK range from £8 to as much as £20 per gram.
Ketamine is currently a class C drug in the uk, although getting busted with it will almost certainly involve a trip to the station, unlike being caught with marijuana another class C drug.
WARNING : Never Attempt To Bomb (swallow packages of) Ketamine, You Will Be Very Sorry :)