Is Viagra Advisable While On Urethral Stick?

I am on 1mg urethral stick but my penis just wont go that tiny bit further to allow penitration I am just in the entrance. I think I am on the maximum dose is there anything eles out there that I can take either with or without the stick. I was wondering if I could take viagra at the same time. I have had my prostrate removed any assistance would gratefully be recieved .