Every PRN medication can carry two safety limits, both enforced server-side at recording time:
The two limits
Limit | Field | Behaviour |
|---|---|---|
Minimum interval |
| How long must pass between PRN doses. Blocks the recording if the previous PRN dose was too recent. |
Max in 24 hours |
| Count of administrations allowed in a rolling 24-hour window (NOT calendar day). Blocks the recording if reached. |
Hard blocks, not soft warnings
Heads up — Both limits are hard blocks at the recorder. There is no "override" path in the standard PRN flow today. If a dose is genuinely needed despite the limit, contact the prescriber for a one-off authorisation — don't try to record around the system.
Rolling 24 hours
Both limits are calculated relative to the moment of recording — not to midnight. If you give a PRN at 23:45 and another at 01:00 the next "day", that's 1h15m apart, not "yesterday's + today's dose".