Best OTC Drugs 2024

Best OTC Choices in Laxatives, Bulk/Fiber

Bulk-forming laxatives, also known as fiber supplements, work by absorbing water into the bowels. This causes stools to become larger and softer, making them easier to pass.

Here are Money’s picks for the best bulk/fiber-based laxatives, along with information on their active ingredients and general notes about efficacy and side effects.

These products were selected by, using a methodology that combines expert assessment with analysis of online reviews, ratings and other customer data.

The information provided on is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. The products featured may not be right for everyone and may carry risk even if available without a prescription. Read the product’s label and consult with a professional for individual medical advice.

Slide Table to Compare
Active Ingredients
Important Points
Benefiber Original Powder Wheat dextrin
  • Sugar-free
  • Dissolves in food and drinks
  • Gluten-free
  • Safe in people 6 years and older
Citrucel Orange Mix Methylcellulose
  • Sugar-free version available
  • Typically produces a bowel movement in 12-72 hours
  • Safe in children 6 years and older
  • Taken up to 3 times a day
FiberCon Calcium polycarbophil
  • Oral tablets
  • Safe in people 12 years and older
  • Typically produces a bowel movement in 12 to 72 hours
Heather's Tummy Fiber Organic acacia powder
  • Safe for people 12 years and older
  • Mixed with liquid
  • Taken twice a day
  • Sugar-free
Kirkland Signature Psyllium Fiber Capsules Psyllium husk
  • Capsules
  • Safe for people 12 years and older
  • Taken up to 3 times a day
Konsyl Original Formula Psyllium husk
  • Powder
  • Mixed with drinks
  • No added sugar
  • Vegan
  • Gluten-free
Metamucil Powder Psyllium husk
  • Comes in different flavors
  • Sugar-free version available
  • Taken up to 3 times a day
  • Safe in people 12 years and older
NOW Foods Psyllium Husk Powder Psyllium husk
  • Powder
  • Mixed into liquid
  • Vegan
  • Taken once a day
No results match.

Featured drugs are available without a prescription in the U.S. and may not be available with or without a prescription in other locations.