Fiber is an essential nutrient that supports digestive health and regular bowel movements. Fiber is in foods like whole grains, fruits and vegetables and can benefit the body by lowering cholesterol, preventing intestinal diseases and constipation and promoting blood sugar control. Individuals who do not get enough fiber through diet may benefit from taking fiber pills (supplements). The University of Maryland Medical Center (UMMC) recommends that people take fiber pills with 8 oz. of water and drink 6 to 8 cups of water throughout the day. Fiber pills are not for people with swallowing difficulties, and can have side effects.
Intestinal Discomfort
Intestinal discomfort is a common side effect of fiber pills. The UMMC and Linus Pauling Institute (LPI) at Oregon State University state that fiber pills can cause gas, bloating and abdominal pain and cramping. People who take fiber and have had intestinal surgery, or have existing intestinal conditions may be at risk for an intestinal obstruction.
Medication Interactions
Fiber can decrease the absorption and efficacy of certain antidepressants and medications used to treat diabetes, seizure, high cholesterol and heart disease. The UMMC recommends taking medications one hour before, or 2 to 4 hours after, taking fiber to avoid negative interactions. According to the LPI, taking fiber pills can also decrease the absorption of the essential minerals iron, zinc, calcium and magnesium.
Allergy
Allergies to fiber are rare, but can develop with prolonged use of fiber pills, according to the UMMC. According to the LPI, anaphylaxis and asthma have been reported with the use of psyllium, a substance high in soluble fiber that is often used as a laxative.
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