Immediate Release
IRDefinition
A drug formulation that releases the entire dose immediately upon administration, allowing rapid absorption and quick onset of action. IR formulations typically require more frequent dosing throughout the day compared to extended-release versions.
Example
Oxycodone IR begins working within 15-30 minutes and is used for breakthrough pain, while oxycodone ER provides sustained relief over 12 hours.
Related Terms
Mentioned in Guides
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Extended Release vs. Immediate ReleaseExtended-release and immediate-release formulations of the same drug can behave very differently in your body. This guide explains the difference, …
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