It depends when it emerged. When I went onto Clozaril which doesn't cause it, it emerged a couple of months later from all the antipsychotics I had been on before. The medications that cause it mask it as well. Then when I couldn't tolerate Clozaril because it caused suicidal ideations and was switched to Invega, it masked it and it appeared better but when I was taken off that as I am now on the experimental phase 2 antipsychotic glycine which cannot cause it, the tardive conditions emerged even worse several months later with extreme severity and I am now being studied by psychiatrists for the condition they are researching tardive psychosis. However, as the other person pointed out anti-depressents don't usually cause it but there have been some cases with SSRI's. See a movement disorders specialist and they could figure out what's wrong regardless.
TD is usually caused by anti-psychotics. It doesn't happen after you stop it happnens when you are taking the drug
The medications go through a testing procedures from Phase I to Phase III and it takes 10-15 years in total. They can do Phase 4 studies which show follow up on what medications can do. Some studies are tentatively finding that the SSRI's can cause tardive dyskinesia. I would see a neurologist for treatment for that condition. I have it from the use of past anti-psychotics and it is treatable.