<prompt> Drug monitoring is required for the followingLithiumParacetamolAmpicillinOlanzapine  <response>: A Lithium Lithium is generally taken with food, although its absorption is not markedly affected by the presence of food. Doses vary widely and are adjusted based on measurements of the levels of lithium in the blood. Early in therapy, dose adjustments are made as often as every 5 to 7 days to establish the correct dose. Patients with kidney diseases excrete less lithium from the body and, therefore, require lower doses. 