Maxperson
Morkus from Orkus
It takes significantly longer. You have to open your pouch, pack or whatever that is closed tightly enough so that stuff doesn't fall out in combat, climbing, etc. Then you have to find the potion, and god help you if you have multiple potions in that container. Then pull it out, uncork it, and swallow it. All in 6 seconds.How is the risk substantially different than drawing a weapon, or nocking an arrow?
Realistically, you aren't doing that in a round, but we handwave the unrealistic portion in the name of fun.