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Here in eastern Canada this is not an issue and I guess I'm surprised to
hear that it is an issue in the US.  Every pharmacy has a copy of the CPS
guide (I think this stands for Canadian Pharmeceutical Society) which
contains information on the ingredients in most drugs.  Furthermore there is
a page in the CPS listing which manufacturers do not use gluten in their
products.  Questions about vitamins or over the counter drugs which our
pharmacist could not answer using the CPS were addressed by the pharmacist
calling the relevant company.  We've had wonderful co-operation from our
local pharmacies and have found them to be an excellent resource for
information.
 
Janet Thomas
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Fredericton, New Brunswick, Canada