What happens if I take more Dilantin than prescribed?

Overdose symptoms include slurred speech, twictching and involuntary muscular contractions, dizziness, slow shallow breathing, and other CNS related symptoms. If you present these symptoms consider the ER post haste, as Dilantin overdoses can be lethal. If you don't show ANY of these symptoms, or any OTHER unusual symptoms, consider yourself lucky and don't OD again.