So far all authorities say prozac is safe long term. Regarding the rash, it is a known side effect, and sometimes the drug is discontinued, especially if there is an allergic reaction that effects the lungs. You should definitely consult your doctor about this.
I found out there is a new long term study out on Prozac and it is linked to causing Parkinsons symptoms. Anyone on Prozac for 5 years or more who has ANY of the above symptoms, even just ONE of them, should talk with their doctor and consider changing medications. I am happy to say I am in therapy now with a great counselor and I am looking forward to possibly being able to be rid of antidepressants someday.