No one wants to deny you a peaceful death nor discounts your wish for your corpse to be unblemished. Don't we all wish for these. Instead, they caution against OTC drugs and paroxetine because, while they may result in great pain and discomfort, organ damage, hospitalization and detention in psych ward, they aren't fatal.
In the PPH and the guide to self-chosen death, the fatal drugs are barbiturates, opioids by injection, fentanyl, amitriptyline and chloroquine.
You can OD on prescription drugs but only certain ones and in large doses. This list of fatal medications and their dosages prepared by some Danish doctors and translated by a member may help.
https://sanctioned-suicide.net/attachments/listen_english-pdf.32719/