 [ Symptoms ] how long is presciption good for  how long can i wait before a prescription will not be filled it is not a controlled substance or antibiotic [ Disease ] that varies there are no set rules some of our electronic prescriptions have expiration dates some pharmacists will not fill an older prescription if it is not medically appropriate since i do not know what you are filling and how old the prescription is you will just have to try and fill it if it is appropriate that you do so at this time at the pharmacy