[3np]

My understanding is that this is also to prevent abuse / recreational use. For example OTC cough pills containing dihydrocodeine (an opiate), but with enough caffeine and others to make recreational doses of the opiate unpleasant even for those with high caffeine tolerance. Or DXM, which is only found with enough guanfecine (IIRC) to make you feel like crap if you take too much. Kind of like how industrial ethanol is mixed with things that would make you vomit.

Or so my pet monkey told me.

[taneq]

This is something that really irks me. The reason you always get paracetamol packaged with codeine is to prevent abuse of the codeine. They'd literally rather you destroy your liver and die than risk getting addicted to codeine.

[kayodelycaon]

Wonderful. Caffeine (and many stimulants) either give me panic attacks or trigger manic episodes.

A cup of green tea is enough to ruin my day and possibly the next week.