Which is the assessment for a certain medication use of a certain patient? To enable to keep track the medication use of a patient thus allowing to make an assessment on it How many drugs does a patient use? Medication use assessment An action with the aim of assessing the medication use of a Patient at a certain time. Medication use This class represents a time indexed situation where a patient uses a certain number of drugs for a certain time. number of drugs It encodes the number of drugs used by a patient at a certain time.