Background/Objectives: A significant gap exists between guideline recommendations and everyday practice. Stringent treatment is needed for vulnerable patients with acute coronary syndrome (ACS). Methods: Data on the lipid-lowering therapy (LLT), including the adherence, persistence, and mortality of patients undergoing percutaneous coronary intervention or bypass surgery in Hungary in 2018 were followed up and analyzed based on the National Health Insurance Fund database until the end of 2020. Results: A total of 12,997 patients underwent revascularization for ACS in 2018, whose discharge therapy included any LLT, a high- or moderate-intensity statin, or ezetimibe at a proportion of 91%, 75%, 12%, and 4%, respectively. By the end of the observation period, the frequency of ezetimibe administration increased to 11%. Persistence decreased, reaching 50% for all therapeutic regimens by month 16. Patients on moderate statin doses had a significantly higher mortality rate at the end of follow-up than those receiving high-intensity statin with (20% vs. 9%, p < 0.0001) or without (20% vs. 14%, p = 0.00029) ezetimibe. Those taking less potent statin doses had higher rates of comorbidities; for example, a minimum of three comorbidities were present in 39% of patients taking medium statin doses and 23% among those on high-intensity statin therapy (p < 0.0001). Conclusions: LLT persistence decreased during follow-up. The administration of a higher-intensity lipid-lowering regimen was associated with better persistence and adherence, along with more favorable mortality rates. Multimorbidity was associated with the use of lower statin doses. The results suggest that more attention is needed in terms of lipid control of females, elderly people, and individuals with several comorbidities, and emphasis should be placed on improving persistence and increasing the frequency of combined LLT prescriptions.