What's the diff btw XL and XR.? And btw sustained and extended release

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Sravani kompella's picture

Answer: 

both XL and XR mean the same and they are used for extended release.

controlled release which means drug will be released at the absoption site at a controlled rate.It  includes 

  • extended release includes again prolonged release and sustained release.
  • delayed release
  • targeted release

hence sustained release is one of the type of extended release where sustained release means drug will be released initially by a loading dose and its rate will be maintained constantly by a maintainence dose.

Extended release drugs are used to minimise the frequency of administeration of a dosage form(twofold).

http://4my4949.blogspot.in/ on april 9th 2013

keerthiyadav's picture

Answer: 

rx and xr are extended release and sustained release is controlled release and exended release is for prolonged period of time.

 

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