> Doing that too often, without letting your serotonin rebuild, can cause serotonin syndrome.

Serotonin syndrome is when you have too much serotonin, not too little.

I apologize for my miswording. Nonetheless, overuse of MDMA can indeed result in serotonin syndrome.

I think classical psychedelics are among the safest drugs, but honestly, how is that not "too much acid"? If they needed medical care, that implies that if they hadn't received that care they would not have been perfectly fine. Yes, it was an accident caused by irresponsible use, but let's not mince words. The point where a dose is "too much" should be (at the most) the point where you need medical attention, not the point where you suffer some permanent damage or death.

"Medical care" for psychedelics really just means "strap them down so they don't hurt themselves thinking they turned into an attack helicopter so they jump off a cliff, and feed them water so they're not dehydrated" and just waiting until it wears off.

You might need medical attention because you'd otherwise hurt yourself, not only because your body is hurt. Most likely, this guy simply picked up the other day and went home.