Most common side effect of phenytoin is:: (A) Gingival hyperplasia, (B) Dental stains, (C) Hypertension, (D) Gingival necrosis
Answer is A. Side Eﬀect Of Phenytoin 

Headache
Nausea
Vomiting 
Constipation 
Dizziness
Feeling of spinning 
Drowsiness
Swelling and bleeding of the gums
Trouble in sleeping or nervousness may occur