You can order it from the Dyflogest website. I won't post it here because I don't know the policy on posting links. If you Google Dyflogest it'd be one of the first pages.
You might be able to get it from a pharmacy, but I haven't seen it at any recently. Dyflogest does pretty much what Peptobismal does, so if you have trouble finding Dyflogest, you could always use Peptobismal.
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I ordered it over the phone but it looks like they have a website you can order from as well at dyflogest.com.