as needed
Upon demand only
As needed means when necessary or required, without a fixed schedule: Take the medication as needed for pain.
The phrase indicates something should happen only when circumstances call for it rather than at regular intervals.
In medical contexts, often abbreviated PRN (from Latin *pro re nata*).
Staff will be added as needed.
- necessaryIndispensable, cannot omit
- requiredNeeded by rule
- optionalNot mandatory
- on demandWhen requested, immediately provided
- occasionallyAt infrequent intervals
sometimes · whenever · urgent · demand · basis · flexible · sporadic · prescription · dosage · situational · intermittent · call · on call · request · emergency · break glass · supply · refill
- dosing instructionsdaily, twice daily, three times daily, once daily, every 4 hours
- dosing timingonce daily, twice daily, around the clock, bedtime dose, morning dose
- infrequencyrarely, seldom, infrequent, infrequently, occasionally
as neededroutinely
As standard practice
regularly · on schedule · periodically · daily · hourly
as neededautomatically
Without manual control
habitually · always · constantly · regardless · unconditionally
need, needed, needs, needing, needful, needless, needlessly, needfulness