#latin maxim

• ab abusu ad usum non valet consequentia — A fundamental principle in bioethics, pharmacovigilance, and clinical toxicology stating that 'a conclusion from the abuse of a thing to its use is not valid'. In medicine, it means that the prohibition or condemnation of a useful drug or medical treatment (e.g., opioids for severe pain) is not justified simply because some patients or individuals abuse it.
• Ab love principium — A Latin aphorism adapted in medical methodology and epidemiology meaning 'let us begin with the most important thing' (literally: 'the beginning from Jove/Jupiter'). In clinical diagnosis, toxicology, and epidemiological tracing, the maxim dictates starting the evaluation with the most probable hypothesis, the most dangerous toxin, or the most critically affected vital organ to optimize intervention time and save the patient's life.