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Wellbutrin XL vs. SR: Understanding Release Formulations


Question
Thanks for your response.  Would you explain to me what the actual difference is between the XL and the SR?  I understand it's extended vs. slow release?  Does that mean that the SR takes longer to act or the extended stays longer?  I am confused about the difference.
Thanks!
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The text above is a follow-up to ...

-----Question-----
I have been taking Wellbutrin XL for over a year and this past month due to insurance restrictions was forced to switch to the generic version of Wellbutrin SR.  I have been taking the medication for two weeks now and I feel like I am slipping back into the depression.  I know that generics are supposed to be equivalent to the brand name but is it possible that the generic is making a difference?
-----Answer-----
lorrie;

well if your feeling some-what different you should call your doctor,maybe he needs to ajust the dose;

sorry i cant do more;

catherine;

Answer
lorrie;

wellbutrin SR-the sustained-release form,in 2 doses,at 8 hour apart;
wellbutrin XL-extended-released tablets should be taken once a day in the morning.

neither med should be crushed or divided,or chewed-you need to take them whole;

catherine;