Safe Dosage of Metamucil (Psyllium) Powder
The safe and effective dose of Metamucil (psyllium) powder is typically 1 teaspoon (approximately 3.4 g) to 1 tablespoon (approximately 6.8 g) taken 1-3 times daily with at least 8 ounces of water per dose.
Dosage Guidelines
Adult Dosing
- Starting dose: 1 teaspoon (3.4 g) mixed in 8 oz of water, 1-3 times daily
- Maintenance dose: Up to 1 tablespoon (6.8 g) mixed in 8 oz of water, 1-3 times daily
- Maximum daily dose: Generally not to exceed 10.2 g (3 tablespoons) per day 1
Timing
- Best taken before meals (15-30 minutes) for optimal satiety effects 1
- Should be spaced throughout the day rather than taken all at once
- Can be taken at bedtime as one of the daily doses
Administration Instructions
- Always mix with adequate fluid (minimum 8 oz of water per dose)
- Stir quickly and drink immediately before the mixture thickens
- Follow each dose with an additional glass of water
- Never take dry (risk of esophageal obstruction)
Efficacy Considerations
Research demonstrates that:
- 6.8 g dose (1 tablespoon) provides more consistent satiety benefits compared to lower doses 1
- Higher doses (6.8-10.2 g) are more effective for reducing hunger between meals 1
- Regular use improves adherence and satisfaction with the product 2
Safety Considerations
Contraindications
- Intestinal obstruction
- Difficulty swallowing
- Esophageal narrowing
- Known hypersensitivity to psyllium
Precautions
- Start with lower doses to minimize gastrointestinal side effects
- Increase fluid intake throughout the day when using psyllium
- Take at least 2 hours apart from medications to avoid potential interference with absorption
- Discontinue use and consult healthcare provider if constipation worsens or lasts more than 7 days
Potential Side Effects
- Mild gastrointestinal symptoms (bloating, gas, abdominal discomfort) 1
- These typically resolve with continued use as the body adjusts
Special Populations
Elderly
- May need to start at lower doses (1 teaspoon once daily)
- Ensure adequate fluid intake to prevent constipation
Children
- For children 6-12 years: Half the adult dose
- For children under 6 years: Consult healthcare provider
Monitoring
- Assess response after 3-5 days of consistent use
- If inadequate response, gradually increase dose within recommended range
- Monitor for adequate hydration, especially in elderly patients
Metamucil is generally well-tolerated when used as directed, with high satisfaction rates reported among users (93% reported ease of use and 83% overall satisfaction) 2.