I know I keep hammering on about it, but in a glass bottle it's lethal.
I gave a bottle to a neighbour with the clear instruction that it was lively and to mind and release the gas.
He drank half and put the bottle away in the cupboard.
His wife was ironing just in front of that cupboard when the bottle exploded. I had used glass Irn Bru bottles, thought they'd be safe enough since they were meant for ginger/pop/fizzy stuff anyway.
The top of the bottle went up like a rocket and punched a dinner plate sized piece out of the two inch thick worktop and bounced that on the ceiling. The exploding glass in the cupboard took out whisky, beer, wine, etc., and the mess of shattered glass and booze was utterly unbelievable......and left a traumatised neighbour shaking like a leaf.
If it hadn't been in the cupboard when it blew, the glass could have been incredibly dangerous.
We got lucky, we got very lucky.
Please learn from this; it's all too easy to cause hurt and damage with fermenting liquids with no gas exit.