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Ketamine has a very steep dose-response curve.
It is a very different drug with very different effects at higher
doses.
However, unlike other psychedelic drugs like LSD,
Ketamine is a short trip, lasting no more than an hour and a half
from start to finish. The duration is not affected by the dose.
So if you're not enjoying yourself, it's all over pretty quick.
common effects for snorted doses
low doses (10-75mg)
A small line of Ketamine, up to 50mg, will induce the mild, trippy
euphoria that has led to its sale as an alternative to Ecstasy.
Smells and tastes seem muted. Visual perception and sense of touch
amplified.
medium doses (60-125mg)
everything in slow motion, buzzing or ringing
in the ears, disconnection from your surroundings, loss of co-ordination
and in less than ten minutes you can find yourself hardly able to
move.
large doses (100-250 mg)
You're in the K-Hole where it is physically difficult
to do anything other than lie in a near-comatose state and stare
at the ceiling. In this state some users report life-altering insights
about the meaning of life. Others are just scared.
mega doses (250 mg+)
You're unconscious.
oral doses
Swallowing Ketamine results in slightly different
effects. The drug goes straight to the liver when it is processed
into norketamine. Norketamine has greater numbing, sedating and
pain-killing effects and will make it more difficult to walk or
move around. The psychedelic effects on the mind also come on slower
and the whole experience can be much longer, up to 4 hours. Snorted
doses also trigger more 'out of body' effects than oral doses.
(1)
injected ketamine
Unsurprisingly injected Ketamine is quicker acting
and has significantly more powerful effects. Effects after an intravenous
(iv) injection begin after 30 seconds and last around 10 minutes.
We strongly advise against intravenously
injecting ketamine. You could pass out before finishing the
injection.
Intramuscular injection (im) effects begin after 2-4
minutes and last up to an hour.

1. Ketamine: Dreams &
Realities p.35
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