This study aims to investigate the delivery of pharmacogenetic (PGx) testing alone or in combination with Medication Therapy Management (MTM) in the community pharmacy setting in order to assess and compare the two delivery models. Using a clust randomized trial, these effects of these two models will be compared. Pharmacist and patient outcome measures will be collected by survey, interviews, and review of pharmacy records. The investigators intend to compare the effect of PGx alone and PGx with MTM from the pharmacy perspective (to assess impact on workflow/operations) and patient perspective (to assess acceptance of testing, understanding of results, medication adherence, and overall satisfaction with delivery model). In the PGx only arm, pharmacists will offer PGx testing to patients who are prescribed one of the 10 eligible drugs (aripiprazole, carisoprodol, celecoxib, citalopram, clopidogrel, metoprolol, nortriptyline, paroxetine, simvastatin, warfarin) and will return results to the patient and physician with any recommendations for drug or dosage changes based on results. In the PGx and MTM arm, pharmacists will offer PGx testing to patients prescribed one of the 10 eligible drugs and provide two MTM sessions: one at the time of testing, and one when results are returned. All patients will be surveyed before PGx testing and 3 months after receiving results. Pharmacists will be surveyed prior to their participation and following the conclusion of the study. Pharmacists will also conduct a chart review of patients and document all interactions with enrolled patients and their providers.