It means to "dispense sufficient quantity". In other words rather than writing a number of pills or amount of liquid the doctor writes how much and how often to take the medicine and the pharmacist fills the amount that equals the number of doses.
"As Directed"
"Every 6 hours, PRN"
Methadone you mean? Yes it does show up in a drug test.
Is it "prd" or "PRN"? PRN means "as needed".
Queer sort
'PO' or 'p.o.' means 'Per Oral'; that is, take the prescribed drug dose by mouth
You will give too small a dose which may mean that the medication is not effective.
erhh.. quick silver
There are questions, or there is qs
Amp. On a drug test stands for Amphetamines, drugs like Adderal, Adderal XR, vyvanse, Ect.
QS can refer to several things depending on the context. In business, QS often stands for "Quantity Surveyor," a professional who estimates and manages construction costs. In healthcare, QS can refer to "Quality of Service," which measures the level of service provided to patients.
"qs" likely stands for "questions." In the context of text messaging or online communication, it is commonly used as an abbreviation to refer to questions.