The best stool hardener is Yerba Prima, as well as Imodium AD and even Pepto Bismol can help with diarrhea.
Imodium slows down the movement or contractions in your intestines so that you can pass firmer stools or firmer poop less often.
Stool hardeners work by slowing down your bowel movements and allowing of more water to be absorbed into your stool, which makes your stool firmer.
Dietary supplements that can help with hardening of the stool and diarrhea are Kaolin, Flaxseed and Psyllium husk.
Probiotics that can help as a stool hardener are Bifidobacterium and Lactic acid bacteria.
To keep your stool or poop firm and avoid loose stools, you should drink plenty of fluids including water to prevent dehydration.
And eat bland and easily digestive foods, like rice, bananas and applesauce and avoid foods that can worsen diarrhea, like alcohol, caffeine, spicy foods and dairy products if you have diarrhea.
Eating more fiber rich foods can also help prevent loose stools and harden your poop.
Bananas, white rice, applesauce and toast all help to firm up your stool and avoid foods that cause gas like beans, brussels sprouts and carbonated drinks.
Eating foods like apples, potatoes, crackers, oatmeal and other cereals are also good for firming up your stools.
If you have diarrhea and it does not go away within a few days or gets worse you should see a doctor or get to the ER as too much diarrhea can lead to dehydration.