Weight (weight-based dosing, e.g. Heparin), renal function (https://kdpnet.kdp.louisville.edu/), body mass index (common in pediatrics and fir chemo) and age (https://nicheprogram.org/sites/niche/files/2019-02/Panel-2019-Journal_of_the_American_Geriatrics_Society.pdf).
Other factors could be concomitant drugs to avoid/encourage drug interactions (https://drug-interactions.medicine.iu.edu/Main-Table.aspx), Pharmacogenomics (https://www.fda.gov/drugs/science-research-drugs/table-pharmacogenomic-biomarkers-drug-labeling) and hepatic impairment (http://archives.who.int/eml/wmf/2004/English/Appendix%20Hepatic%20impairment.pdf)