Milk to donate..

I have 200+ ounces I would like to donate. I have a 3 month old son who I breastfeed. However I am making much more than he can eat. I'm 27, healthy. I rarely drink, do not smoke. I do not do anything illegal. I take prenatals, and started Zoloft 2 weeks ago. From what I've read Zoloft is completely safe- and I have not noticed any change in my little man. I can provide you with my prenatal screening labs. My only concern in this is not having liability. I know my milk is good, but worry if ...