Antivenom is modern medicine's answer to the tribalantidote. Its use can cure any poison, and fixes the "blur" side effect instantly. To use this medicine one must drink it. Antivenom is a purely medicinal consumable with no side effects other than a bad taste.
Prior to patch 188.8.131.524, the recipe for antivenom required a total of four radscorpion poison glands, rather than two.
Behind the scenes
Originally, it was planned to have specific types of antivenom for the different types of venom each animal had. However, at some point during development, the antivenom items was simplified to a cure all generic antivenom. However, there are several variations of the antivenom flask with the game files with differing textures and model names, antivenombark, antivenomcaz and antivenomrad, signifying what type of venom they were meant for.
↑The Courier: "Any more recipes.. or histories... you can teach?" Ulysses: "Antivenom's helpful around the Mojave with the Bark Scorpions. Even one sting can kill you. Tunneler bite can be just as bad. My tribe, Twisted Hairs, had a better way than Antivenom, if you act fast. Snakebite Tourniquet - cuts off the venom, no need to scavenge glands and blood. Or drink that mess. Part of the reason we wore our hair like we did, like I do now. Here's some for the road - trick to making it's not hard. Get bit, hook and twist it. Fast as blinking, doesn't give poison time to sink in." (Ulysses' dialogue)