Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Medication ( Code VARCHAR, name VARCHAR )
TABLE: CREATE TABLE Prescribes ( Patient VARCHAR, Medication VARCHAR )
TABLE: CREATE TABLE patient ( name VARCHAR, SSN VARCHAR )

### Question ###
Find the names of patients who are not using the medication of Procrastin-X.

### Accurate SQL ###

SELECT name FROM patient EXCEPT SELECT T1.name FROM patient AS T1 JOIN Prescribes AS T2 ON T2.Patient = T1.SSN JOIN Medication AS T3 ON T2.Medication = T3.Code WHERE T3.name = 'Procrastin-X'