Patients taking phenytoin (Dilantin) for control of seizures must be aware of which adverse effect(s)? (Select all that apply.)

A. Blood dyscrasias: This is a correct choice. Phenytoin can cause blood dyscrasias, including conditions like leukopenia, thrombocytopenia, and anemia. B. Hyperglycemia: This is not typically associated with phenytoin. The primary adverse effects related to blood sugar are usually changes in glucose metabolism or hypoglycemia. C. Urinary retention: This is not a common adverse effect of phenytoin. It is more associated with other medications or medical conditions. D. Gingival hyperplasia: This is a correct choice. Phenytoin is known to cause gingival hyperplasia, which is an overgrowth of the gum tissue. E. Sedation: This is not a common adverse effect of phenytoin. Phenytoin is more known for causing CNS-related side effects like nystagmus, ataxia, and dizziness.