instruction: give me the number of patients whose year of death is less than or equal to 2158 and drug name is oxycodone-acetaminophen elixir?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE demographic.dod_year <= "2158.0" AND prescriptions.drug = "OxycoDONE-Acetaminophen Elixir"