Hi K2024,
As far as I'm aware there is just the one HealthUnlocked, so that would be the UK one. I don't think there is an Australian specific one. I am on it in relation to an autoimmune disease I have and there are people participating from the UK, North America, Australia and elsewhere, so it's like a kind of international community even though it originates in the UK. So basically it is topic driven and you can join a community on there that is relevant for you. Depending on the individual community, some have a moderator or guide of sorts, such as the community I'm on. Other communities not so much. So just keep in mind they are a support community but not everything posted is highly accurate medical info but more people's experiences and people learning from one another.
In relation to your medication, it will probably be discussed across several communities on there as it is widely used in relation to depression, pain management, sleep etc. So you will probably find quite a few discussions on it. The med you are on goes by other brand names in different countries, so using it's medical name rather than brand name may help you to access greater information.
It's sometimes good to have Australian-specific sources of course and there may be an equivalent type of Australian-based forum for discussing meds here that I'm unaware of. You could do some searching to see what's out there. I just mentioned HealthUnlocked because it's one I know and have used over the last 4 years.
