Hello Ellacancan, welcome to Psych Central forums,

I am not an expert on medication but I did come up with this >>> Psych Central Reviews - Lithium carbonate if you scroll down it has some reviews from long term users and most say they have had no long term issues with it. Other people have other medications on top of lithium though there are some drug interactions listed on that link I have provided. Your doctor will look into your history and know whether there are likely to be any issues with adding another medication.

Hopefully other members will chime in with their experiences of it.

You might also like to ask your question in the Psychiatric Medications forum.