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I find this surprising, are you sure it's not based on the concentration of the permethrin? Here in the US, I was able to buy a clothing spray of 0.5% permethrin from Home Depot. I'm also reasonably certain that at least some lice shampoos I've seen at my nearby CVS use permethrin, although I checked the one I bought and it doesn't have it.

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Can confirm above comment. Only thing close we can buy is permethrin impregnated clothes for mosquitoes. No permethrin anything otherwise. I have some, but only because I had my sister ship it from the states. Blows my mind that you can buy up to 36% permethrin by the jug down there

You can get a weak version on Amazon (0.35)

https://www.amazon.ca/OnGuard-Pro-Perm-Residual-Non-Flammabl...

That's so bizarre. Both that you aren't allowed to buy it at any % concentration (not in clothes), and that my Random Ass could buy it at up to 36%.

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