IN 7 years I have only needed to treat an RI twice. Both snakes recieved a two week treatment and both ar enow fine. I think it really depends on the treatment used and the conditions of its enclosure. When a pastel was being treated and for a couple months after, I kept his enclosure a few degrees higher on both hot and cool sides. Also raised the humidity.

A boost in temp and humidity really helps. If the snake shows no signs of sickness now it should be ok.