Fwiw, vomiting is probably towards the bottom of the list of reasons why SN can fail. The dose we take of 25g is 8-25x the actual lethal dose, and this is done so that your body gets flooded with SN and even if you vomit you likely ingested more than enough; this is doubly true if you're taking Meto in your SN plan, since Meto speeds up gastric emptying thus quickly letting the SN enter your small intestine for absorption. So if you took Meto and vomited your SN, you likely ingested even more than someone who did not have an antiemetic. And the backup glass of SN is advised just to be safe. So in terms of vomiting, it shouldn't
necessarily be a worry for you.
The first two reasons for failure that CantDoIt listed are your top concerns. You may feel the urge to call emergency services since SI can kick in while you're waiting to pass out, and SN symptoms can be scary if you're not ready for them. And if you don't live alone, there's always the chance someone will walk in on you, even if they aren't expected to return for a certain amount of time (coming home early, for example). From the SN successes and failures thread, it appears most failures were because someone came in too early, or they called emergency services before they passed out. The PPH also supports this claim, as failures are generally the result of medical intervention, rather than anything to do with the SN. Failures can also arise from not following protocol as well.
Hope this helps. And of course, do wait and see if anyone who has any personal experience with those things replies to this thread. Information is power.
Proof Vomiting is not always a failure thread:
https://sanctioned-suicide.net/thre...-on-the-forum-as-a-cause-of-sn-failure.47986/
SN Successes and Failures thread:
https://sanctioned-suicide.net/threads/sn-successful-and-unsuccessful-cases-2023-update.120854/
edit: edited actual lethal dose numbers. Lethal dose for an average person is 22mg per kg (forgot about this, remember reading it somewhere though). So it can be anywhere from 25x the lethal dose if you're very light, to about 8x if you're quite heavy (not morbid obese though).