<<Disclaimer: Verify this information before applying it to your situation.>>
 
If you need to find out if a medicine is Gluten Free here in Australia, there
is a company (MIM) that produces a book containing data on all the drugs for
the information of Doctors and Pharmacists.  They produce a bi-monthly update
which is called "MIM's Bi-Monthly" (I think) which lists all ingredients and
indicates, apparently, whether or not they are GF.  So for all you Coeliac
sufferers in Australia, this should be of assistance.