I cannot fast this month due to medication issues, I want to pay the kaffara but there are alot of junkies in my area and I prefer paying the funds to a Shia Islamic Center for such a purpose or Salvation Army etc. My questions are is this permissible? And if so, how much do I pay for the whole month?

Fidya is to be paid to poor needy Shia Muslims. For each day it currently equals about $5 a day. You can get an Islamic center or organization such as IMAM to carry this out for you to make it easier if you wish.