I have to wonder myself, bought pack on 10mg as trip extended & tried taking 10 at once (100mg). My prescription is 15mg a day & to be honest they didn't seem to do much at.
So bought couple strips elsewhere to test & again i wonder. Aware shouldn't be taking that much but best way to tell. Lucky still enough of genuine ones to get me sorta through. Annoyingly the price & availability with no queries is a bit concerning, Diazepam shouldn't just be given out like lollies (sic). Luckily as said i do need them.
Buy a strip & see for self.