A nasal spray that serves as an analgesic and minor stimulant, Linoten is used by Slippery Jim Di Griz to restore his equilibrium after a nasty bump to the brainbox. Little more has been revealed, but much can be inferred from what has.
Linoten appears to be a legal drug, and likely an over the counter medication. Di Griz mentions that its effects are relatively low on the scale, as he does not wish to derange himself when he uses it.
Note: There is a real world drug named Linoten, but it differs substantially from the one described in the novel.
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