I found this site trying to find more information on the SN method other than what was written in the 2018 print edition of the PPH
I learned that if you are young, strong and healthy that the SN method might not be as peaceful and reliable as the PPH says. 7 & 7
First the PPH says vomiting is unlikely which is totally wrong and basically the worse thing that could happen during an SN attempt. The PPH first said that 10 grams would be enough then changed it to 15 grams. The PPH also said to use Sodium Bicarbonate (baking soda) then changed that to Cimetidine (Tagamet) The one and only case study in the PPH of a SN suicide is of someone who was probably very old, very weak, and terminally ill who they say weighed 46 Kg which is only 101 lbs. ! I basically learned that if you attempt this method you definitely need the right anti e's you probably want to up the dosage, take some sleeping pills and if it was me drink a half a bottle of Imodium ad to reduce stomach pain. the active ingredient in Imodium ad is Loperamide
https://en.wikipedia.org/wiki/Loperamide. Loperamide is also an opiate similar to morphine but not as powerful. people have actually died from Imodium ad overdose.
https://www.dailymail.co.uk/news/article-4796148/Father-27-died-accidental-overdose-Imodium.html