Fiber

Mechanism-of-action class: Biological Macromolecular Activity.

• Use For relief of occasional constipation and to induce regularity. Generally produces bowel movements within 12-72 hours.ICD-10: K59.00

Directions Mix this product (child or adult dose) with at least 8 ounces (a full glass) of water or other fluid. Taking this product without enough fluid may cause choking. See choking warnings. Adults and children 12 years and older One teaspoon 1 to 3 times daily Children 6 years to under 12 years of age ½ teaspoon 1 to 3 times daily Childre4n under 6 years of age Consult a doctor

Allergy alert: As with any natural grain product, inhaled or ingested psyllium powder may cause an allergic reaction in people sensitive to psyllium. Choking Taking this product without adequate fluid may cause it to swell and block your throat or esophagus and may cause choking. Do not take this product if you have difficulty in swallowing. If you experience chest pain, vomiting or difficulty in swallowing or breathing after taking this product, seek immediate medical attention.

The 10 most recently updated of 3,053 ClinicalTrials.gov registrations naming Fiber as an intervention. Registration is not evidence of efficacy or safety — reference crosswalk only.

• Investigation of Medical Management to Prevent Episodes of Diverticulitis Trial
  Completed · Interventional · 71 enrolled · University of Washington
  NCT05681559updated 2026-06-12
• Dietary Insights and Nutritional Education in Adults on GLP-1 Therapy
  Recruiting · Interventional · 50 enrolled · University of South Carolina
  NCT07518407updated 2026-06-12
• Bisnorcymserine in Healthy Adult Volunteers
  Completed · Phase 1 · Interventional · 75 enrolled · National Institute on Aging (NIA)
  NCT01747213updated 2026-06-12
• Comparison of the Effects of Kinesio Taping and Interval Exercise in Patients Diagnosed With Venous Insufficiency: A Randomised Controlled Trial
  Active not recruiting · Interventional · 33 enrolled · Necmettin Erbakan University
  NCT07228585updated 2026-06-12
• Acute Microbial Switch
  Completed · Interventional · 29 enrolled · Maastricht University Medical Center
  NCT05764200updated 2026-06-11
• A Phase 4 Clinical Study to Investigate the Effectiveness and Safety of Skin Resurfacing
  Active not recruiting · Interventional · 49 enrolled · Bausch Health Americas, Inc.
  NCT07214272updated 2026-06-11
• Dietary Interventions in Cancer Patients Treated With Immune Checkpoint Inhibitors
  Recruiting · Interventional · 70 enrolled · University of Pittsburgh
  NCT06475807updated 2026-06-11
• Collecting Data on Retinal Blood Blood Flow and Blood Vessel Shape/Appearance Using an Investigational Device, XyCAM CRE, and to Then Compare Those Images With Images Collected From a Patient's Routine Clinical Examination.
  Not yet recruiting · Observational · 350 enrolled · Stuart Terry Eye Associates
  NCT07641738updated 2026-06-11
• Sepsis Multiomic Analysis & Risk sTratification in China
  Recruiting · Observational · 1,400 enrolled · Yuebei People's Hospital
  NCT07599644updated 2026-06-11
• Effects of Food Intake Sequence on Substrate Utilisation and Endurance Performance
  Completed · Interventional · 18 enrolled · Universidade do Porto
  NCT07503990updated 2026-06-10

Frequently asked questions

How does Fiber work?

Mechanism-of-action class: Biological Macromolecular Activity.

What is Fiber used for?

According to FDA labeling, Fiber carries indications including: Use For relief of occasional constipation and to induce regularity. Generally produces bowel movements within 12-72 hours.. This is a reference summary of labeled uses, not medical advice or a treatment recommendation.

What class of drug is Fiber?

Fiber is classified as Biological Macromolecular Activity, Metabolic Activity Alteration.