GAS AND AIR
Entonox, or gas and air, is a mix of half nitrous oxide (better known as laughing gas) and half oxygen. You can have it at home or in the hospital or birth centre, and you can use it in a water birth, too. Some women swear by it and wish they had a canister permanently installed in their kitchen; others dislike it intensely and say it makes them dry-mouthed, nauseous or woozy. Because you inhale it, it’s fast to enter your body and fast to leave, so if you don’t like the feeling, you won’t be stuck with it for long.