instruction: what drug has patient 77177 been prescribed two or more times?
response: SELECT t1.drug FROM (SELECT prescriptions.drug, COUNT(prescriptions.startdate) AS c1 FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 77177) GROUP BY prescriptions.drug) AS t1 WHERE t1.c1 >= 2