I did a quick search for lithium orotate (the generic name for Serenity) and there are a number of things I found. First it's not FDA approved. Secondly a study (url below) has shown it to be worse on the kidneys that ordinary lithium carbonate. Overall the impression I get is that lithium orotate doesn't sound like a well researched medication and personally I'd stay clear of it, you could be better off going to one of those Cure All medicine wagons they had 200yrs ago!
A quote from the abstract:
It seems inadvisable to use lithium orotate for the treatment of patients.