I have as well. Swallowing a handful of pills used to be no problem but now I split them up. Once the gagging starts it is hard to stop. My gag reflex was almost nonexistent before so this takes some adjustment. It does not really make me sick though.
My gag reflex turned much more sensitive after starting reta. I cannot have any liquid before brushing my teeth and tongue in the morning or I gag and get sick. Smells I used to handle now affect me strongly. After three drinks spread over five and a half hours I stepped outside into cigarette smoke and gagged until I was sick. Has anyone else developed a gag reflex sensitive enough to cause actual vomiting? Searches show some gagging reports with Tirz but the change has been clear and steady for me.