Pharmacodynamics is the study of biological measurements that represent the effects of a drug on the body.  Pharmacodynamic measurements are hugely varied and new pharmacodynamic endpoints are constantly invented.  Some example pharmacodynamic measurements include

•   Protein phosphorylation status of a drug target
•   Transcription of genes influenced by the drug
•   Downstream physiological responses such as blood pressure
•   Assessments of response to stimulus such as a reaction time or an induced immune response
•   Patient reports of symptom severity on continuous or categorical scales
•   Counts of patient events such as seizures
•   Durations until critical events like relapse or hospitalization

The list is potentially endless and encompasses many different types of data with complex relationships to drug effects and disease progression.