The "what else was in the system" field, and why it is the whole board

If you only get one field right, make it this one. Most of the reports that teach anything are not about a substance — they are about a combination, and the combination hides in the things people do not think to mention. The usual omissions, and why each matters - Fluoxetine (Prozac): half-life of days to weeks. Someone who "stopped it last week" is still a CYP2D6 inhibitor and still serotonergic. The most under-reported interaction on any experience board. - Grapefruit / Seville orange: a CYP3A4 knock-out that lasts ~a day — spacing it out does not help. - Alcohol and nicotine: everyone forgets to list them. Alcohol + kava is a documented liver hit; nicotine changes a lot of pharmacokinetics. - Caffeine: a competitive substrate and, in quantity, a cardiovascular variable in its own right. - "Natural" supplements: St John's wort (a CYP3A4/P-gp inducer), piperine (an inhibitor), high-dose anything. How to write it so it is useful List the dose and the LAST time taken, not just "I take X". Half-life is the hidden variable: a drug taken 36 hours ago can still be fully active. If you take a regular medicine, name it even if you are sure it is unrelated — "sure it is unrelated" is exactly how interactions get missed. A report that says "nothing else" is making a strong claim; make sure it is true before you type it. The interaction map that most of these questions resolve against: https://wiki.soapbox.community/wiki/Cytochrome_P450_System_Inhibition_and_Induction