Table 2.

Incidence of some abnormal movements associated with phenytoin in the literature

MD	Incidence (%)	NR	n	Reference	Notes
Choreoathetosis	0.72	1	139	Cranford et al. (1978)	Intravenous PHT
ATX	62.96	17	27	Mellick et al. (1989)	Acute PHT intoxication
Horizontal nystagmus	37.04	10	27
Wide-base/staggering gait	22.22	6	27
Vertical nystagmus	18.52	5	27
Tremor	11.11	3	27
Status dystonicus	11.11	3	27
Intention tremor	7.41	2	27
Tongue fasciculations	3.70	1	27
Nystagmus	3.85	4	104	Ryan et al. (1989)	PHT use in preeclampsia
Choreoathetosis	2.88	3	104
Incoordination	2.88	3	104
Nystagmus	95.29	81	85	Murphy et al. (1991)	Acute PHT intoxication
ATX	88.24	75	85
Asterixis	1.18	1	85

ATX: Ataxia, MD: Movement disorder, n: Number of individuals in the study using PHT, NR: Number of reports with the movement disorder, PHT: Phenytoin