Over-the-counter antidiarrheal medications are used to treat diarrhea, according to WebMD. However, do not use over-the-counter remedies for diarrhea if experiencing bloody diarrhea or a high fever.
It is important to follow the label directions when using an over-the-counter antidiarrheal medication and take the recommended dose, explains WebMD. Using this medication for too long is not recommended as constipation may occur. To avoid constipation, doctors suggest a person stop taking the medication as soon as his stool begins to thicken.
There are a number of different types of antidiarrheal medications on the market, notes WebMD. One type of medication helps to thicken the stool, usually with the inclusion of psyllium. The psyllium helps to remove water from the stool and thicken the consistency. Another type of antidiarrheal medication is known as antispasmodic antidiarrheal; this medication helps to stop the spasms of the intestine. There are also products that contain both antispasmodic ingredients and psyllium.
A third medication for diarrhea is a probiotic such as Lactobacillus, states WebMD. These medications are available in powder and pill form. The bacteria in the probiotic occur in the intestine naturally and may help to aid digestion. When a person has diarrhea, this bacteria is reduced.