Naproxen is OTC in the US, as Aleve, but you need a prescription for higher doses, like with ibuprofen.

That sort of logic has never made sense to me. It's as if the regulators think people would never take more than one at a time.

The regulators think, quite correctly, that people will generally take the dose on the bottle. If you only allow sales of Ibuprofen in 200mg pills and the bottle says “take two”, that’s what the vast majority of the public will do. If you allow sales of “ultra strength” 2000mg pills, a decent chunk of the population will take 2-4 grams because “ultra” must be better.

You can’t buy more than 2 packs of 200-250mg ibo in the UK at the time, and only one pack of anything higher, doses above 500mg require a prescription.

Prescription Ibo can be 2000-5000mg per pill so yes it does reduce the risk.

That's... different. Here in the US I can walk into into any pharmacy or supermarket and buy a bottle of 500 or even 1000 200mg does for <$20.

That's pretty insane, 10 or 12 ibo pills here cost like $5-6 and the UK is considered to have relatively cheap OTCs.

Hrrm?

This site seems legit, and offers 84 400mg pills for #2.99