Weirdly, I've also heard from people in that situation that more acid => less reflux because the sphincter only closes in high-pH environments. So one of the things prescribed can be hydrochloric acid supplements. Some people swear by them.
Symptoms of chronic acid reflux, laryngopharyngeal reflux and heartburn can also be caused by hypochlorhydria (low stomach acid), in which case taking hydrochloric acid will obviously also reduce the symptoms in that case.
Weirdly, I've also heard from people in that situation that more acid => less reflux because the sphincter only closes in high-pH environments. So one of the things prescribed can be hydrochloric acid supplements. Some people swear by them.