Can I switch from Fiberlax (polycarbophil) to Reguloid (psyllium) for my fiber supplement due to stomach cramps?

Switching from Fiberlax (Polycarbophil) to Reguloid (Psyllium) for Stomach Cramps

Yes, you should switch from Fiberlax (polycarbophil) to Reguloid (psyllium) for your fiber supplement, as psyllium is the only fiber supplement with consistent evidence for effectiveness and is better tolerated than polycarbophil, which has no proven benefit for constipation and can cause abdominal cramping. 1, 2

Why This Switch Makes Sense

Psyllium Has Proven Efficacy

• Psyllium is the only fiber supplement with consistent clinical evidence for improving bowel function, while polycarbophil has very limited and uncertain data supporting its use 1, 3
• Psyllium increases weekly bowel movements by an average of 2.32 movements and improves overall symptom relief with a relative risk of 1.86 4
• The American Gastroenterological Association guidelines specifically recommend psyllium as an effective treatment for chronic constipation 1

Polycarbophil Lacks Evidence and Causes Side Effects

• Calcium polycarbophil has no effect on stool consistency or viscosity in clinical studies, unlike psyllium which significantly improves both 2
• In comparative studies, polycarbophil provided no additional benefit for constipation management and actually increased cholesterol levels rather than lowering them 5
• Your stomach cramping is a recognized side effect of polycarbophil that makes it less tolerable than psyllium 1, 2

How to Use Psyllium (Reguloid) Correctly

Critical Dosing Instructions

• Start with 5 grams twice daily (this is the minimum effective dose) 4
• You must take each dose with at least 8-10 ounces (240-300 mL) of water - this is non-negotiable to prevent constipation or blockage 1, 3, 4
• Continue treatment for at least 4 weeks to achieve optimal benefit 4

Expected Side Effects

• Flatulence is the most common side effect but is generally mild 1, 3, 4
• Some abdominal distension may occur initially but typically does not require stopping the medication 4
• These side effects are significantly less severe than the cramping you're experiencing with polycarbophil 2

Important Safety Considerations

Allergy Warning

• Be aware that psyllium can cause allergic reactions in people sensitive to inhaled or ingested psyllium 6
• If you develop any allergic symptoms, discontinue immediately

Hydration is Essential

• Adequate fluid intake with each dose prevents potential constipation or intestinal blockage 3, 4
• If you cannot consistently drink 8-10 ounces of water with each dose, consider alternative therapies like polyethylene glycol instead 4

What to Expect

Timeline for Improvement

• Most patients see improvement within 4 weeks of consistent use 4
• Psyllium works by absorbing water and adding bulk, which normalizes stool consistency 3
• The effect is durable and can be maintained long-term 1

If Psyllium Doesn't Work

• If you don't see adequate improvement after 4-6 weeks of proper psyllium use, consider adding polyethylene glycol (PEG) 17 grams daily, which costs only $10-45 monthly and has strong evidence for effectiveness 1, 7
• A stimulant laxative like senna 8.6-17.2 mg daily can be added if needed 7