Many people find that after they have gone off a particular SSRI, when they go on it again, its effectiveness is different. However, some people also find that long-term SSRI treatment becomes less effective over time. It varies between people.

I think that unless one is a psychiatric doctor, it is impossible to say whether drug treatment is appropriate. Frankly Anthony, I know that you mean well, but you are advocating against medication from a layman's perspective. Only a PTSD sufferer's doctors can help them make medical decisions.