Guest guest Posted December 28, 2003 Report Share Posted December 28, 2003 Click here: https://www.duragesic.com/files/duragesic_pres_info.pdf Here is the prescribing information for Duragesic. It states, " Peak serum concentrations of fentanyl generally occured between 24 and 72 hours after initial application. " So, it takes up to a full 72 hours to get the full effects of the medication. This information is from the website, http://www.duragesic.com. It is the full prescribing information, and is in PDF format, so you will need adobe acrobat in order to read this. Robin Quote Link to comment Share on other sites More sharing options...
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