Avipro or Bio-Lapis are for use when the piggy is on anti-biotic,but it can also be used if the piggy has a mild tummy upset.Probiotics balance up the good and bad flora in the gut.,they can,sometimes,perk up the app'etite of a piggy that is off ites food.Neither of these products should be used long term though,a few days only,unless directed otherwise by a piggy experrt vet.Remember they are medications and should be treated as such.
Critical Care should only be used for pigs who are not eating at all,or are just picking at food and losing weight.Again,it should not be used long term.In fact I never use Critical Care by itself.I mix it with ground up dry mix and liquidized veggies.This gives the piggy a more normal diet.I put less and less Critiical Care into the mix every day.
Critical Care comes in small packets,and once open deteriorates very quickly.