Pharmacology Central Nervous system 62c6532d Therapeutic level of phenytoin is A 0-9 mg/ml B 10-19 mg/ml C 20-29 mg/ml D 30-39 mg/ml High-Yield Explanation Phenytoin therapeutic plasma concentration is 10-20 mg/ml. Ref: K D Tripati 7th edition Page no 422. Table 30.2