<prompt> Monitoring of drug level is not required with:LithiumL-DopaDigoxinPhenytoin  <response>: Ans: B L-Dopa Ref: Goodman Gillmans The Pharmacological Basis of Therapeutics, 20I1 12th Edition, McGraw Hill Barton LL P 447, 803,592Explanation:Except L- dopa ah other drugs are having a narrow safety margin hence monitoring of these drugs are essentialDigoxin : 0.5-lngmLPhenvtoin: Total- 10-20mcgmL free concentration of 0.75-1.25 mcgMlLithium : 0.6-1.5 mEq L 