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Many drugs/toxins cause nystagmus, particularly in overdose. Vertical, horizontal, or rotary nystagmus may be noted.
The most common drug/toxin overdoses that cause nystagmus are the following:
- Anticonvulsants (phenytoin, carbamazepine, valproic acid, lamotrigine, topiramate)
- Ethanol
- Lithium
- Dextromethorphan
- Phencyclidine (PCP)
- Ketamine
- Lysergic acid diethylamide (LSD)