I'm not a user nor a lurker, so am not familiar with the site.
I saw this from MSE and thought I'd
stick my nose in respond from a new user/neutral perspective.
You don't outline any problems in your question other than the moderators should do "something". So I (as I'm sure others users will be) am not sure what it is you feel they should do, and so have no ideas nor arguments either way as to whether they should do "that" or not.
The only actual issue I can take from you question is:
How to make more pressure on the mods?
Pressure to do what? If you mean generate more content, then that's their choice as standard users of this site and without obligation, just like you and everyone else.
If you mean duties they are obligated to do as a moderator, then you will have to be clear on what the problems are which need resolving.
Maybe because I'm not familiar with the site that there is some "inside" known problem around here. However, that doesn't make it ok for your question to be vague, as this makes it difficult to develop useful discussions and viable suggestions to be proposed.
There will also be lurkers, and users with regular activity on other Stack Exchange sites who are clued up on the general structure of the sites who could perhaps chip in and suggest things, such as something which worked on another site, etc. They cannot help unless the problem is outlined clearly.
I did see some meaty discussions loosely linked from this question about "not enough content" and "need more moderators". Neither of which are moderator duties.
If the issue is "poor content/inaccurate voting, etc", then you need to realise the responsibility to keep the site clean and moderated on a basic level is mostly on community (non-moderators). So that would invalidate this question being about moderators (tho I'm still unsure what your question is about).
Is quite new, and is obviously trying to gather a bit of motion, and because of that I cannot see why there is any moderator issue yet, not until there is a lot more and regular content being posted, reviewed, etc, which requires moderator intervention.
To make the site work and generate more content, and more and returning users, the general community (you, not moderators) need to be really friendly, welcome people, comment and answer best you can and as quickly as you can. Vote where appropriate as much as possible, and generally put a lot of effort in to make the site grow.
This has nothing to do with requirements from moderators either, and until this happens, I cannot see what moderator issue there would be (again, without you being more specific).
I'd honestly stick around and help out, but I know nothing about medical things whatsoever.