Secondary prevention with medications is essential for the better prognosis of patients who have experienced cardiovascular events. We aimed to evaluate the use of guideline-based medications for secondary prevention in older adults in the community settings after discharge following percutaneous coronary intervention (PCI). A retrospective cohort study was conducted using anonymized claims data of older beneficiaries in a suburban city of Japan between April 2012 and March 2015. The prescriptions of antiplatelets, statins, angiotensin-converting enzyme inhibitors (ACEi)/angiotensin II receptor blockers (ARB), and β-blockers were evaluated for 3 months before and after the month in which the participants underwent PCI. Multivariable logistic regression analysis was conducted to evaluate the associations of age (“pre-old” group 63-72 years vs. “old” group ≥ 73 years) and sex with the prescriptions, adjusting for whether a participant was followed-up by the PCI-performing hospital. Of 815 participants, 59.6% constituted the old group and 70.9% were men. The prescription rates for antiplatelets, statins, ACEi/ARB, and β-blockers after discharge were 94.6%, 65.0%, 59.3%, and 32.9%, respectively. The adjusted analysis indicated that statins were less likely to be prescribed for the old group (adjusted odds ratio aOR, 0.70; 95% confidence interval CI, 0.51-0.95; p = 0.023) and for men (aOR, 0.64; 95% CI, 0.45-0.89; p = 0.008). β-blockers were more likely to be prescribed for men (aOR, 1.66; 95% CI, 1.17-2.33; p = 0.004). Our results suggest the potential for improvements in secondary prevention by increasing the prescription rates of guideline-based medications in this population.