I have the Trazodone Pliva 434.I was on them for a about 3 1/2 years, on and off., its been about a year since I've taken one. I began feeling much better. I have quiet a few left over. These days i am getting depressed again, but it isn't as bad as before.Is it okay to take Trazodone Pliva 434 that were left over from a year ago?