Why have many regions implemented stricter regulations regarding paraquat usage?

High incidence of intentional self-poisoning cases

The extreme toxicity and lack of an effective antidote for paraquat have led many governments and regulatory bodies worldwide to reevaluate its availability. The high incidence of intentional self-poisoning cases has been a major driver for policy changes, with many jurisdictions opting to ban or severely restrict the use of the herbicide. Regulations often limit its sale to certified applicators or prohibit formulations above specific concentration thresholds. This regulatory strategy is an acknowledgement by public health authorities that the most effective way to manage the dangers of paraquat is to prevent human exposure from occurring in the first place, given the near-intractability of treating the poisoning once systemic absorption is complete.