How to Use the Prescription Validity Calculator
Enter the prescription issue date and select the prescription type. The calculator shows the last day the prescription can be legally filled based on US federal DEA rules and common state standards.
US Prescription Validity by Type
- Non-controlled (standard): Valid for 12 months — unlimited refills as written
- Schedule III–V: Valid 6 months — up to 5 refills
- Schedule II: Valid 6 months — no refills allowed (new Rx required each time)
- State laws may impose shorter validity periods
Frequently Asked Questions
What are Schedule II controlled substances?
Schedule II includes drugs with high potential for dependence such as opioids (oxycodone, hydrocodone), stimulants (Adderall, Ritalin), and some sleep medications. These require a new written or electronic prescription each time — no refills are permitted.
What if I lose my prescription before filling it?
For non-controlled prescriptions, your doctor can issue a replacement. For Schedule II controlled substances, the original must typically be presented. Contact your prescribing physician as soon as possible if you lose a prescription.