A toxidrome is a syndrome (set of symptoms) caused by specific medications or toxins.
There are 5 big ones to know:
Anticholinergic: low potency antipsychotics, oxybutynin, ACh receptor antagonists (ipratropium, atropine, scopolamine)
Cholinergic: ACh recptor agonists (pilocarpine), AChEIs (organophosphates, phyostigmine)
Opioid: Morphine, heroin, hydromorphone, etc
Sympathomimetic: epinephrine, cocaine, amphetamine (Aderol), methylphenidate (Ritalin)
Sedative-Hypnotic: Benzodiazepines, barbituates, “Z-drugs” (zopiclone, zolpidem), antihistamines