A nurse is caring for a client who is taking phenytoin. For which of the following adverse effects should the nurse monitor and report to the provider? b. Tachycardia +. c. Elevated blood pressure d. Tinnitus Rationale: phenytoin (Dilantin, Phenytek) : Classification: antiarrhythmics, anticonvulsants. Pharmacologic: Hydantoins. Pregnancy category: D. Indications: treatment/prevention of tonic- clonic (grand mal) seizures and complex partial seizures via enhancing inhibitory effects o...