Lax-a-Day Dosage Recommendation
For adults and children 17 years and older, the recommended dose of Lax-a-Day (polyethylene glycol 3350) is 17 grams once daily, dissolved in 4-8 ounces of any beverage. 1
Dosing Details
Adults (17+ years)
- Standard dose: 17 grams (one capful measured to the white line) once daily 1
- Mix in 4-8 ounces of liquid (cold, hot, or room temperature)
- Ensure powder is fully dissolved before drinking—do not consume if clumps remain
- Duration: Do not use for more than 7 days without medical supervision 1
- Expected effect: Produces bowel movement in 1-3 days 1
Children (16 years and under)
- Consult a physician before use 1
Clinical Context from Guidelines
The 2023 AGA-ACG guidelines support polyethylene glycol (PEG) as a first-line osmotic laxative for chronic idiopathic constipation, with an initial dose of 17 g daily 2. The guidelines emphasize:
- No clear maximum dose—titrate based on symptom response and side effects 2
- PEG demonstrates durable response over 6 months 2
- Common side effects include bloating, abdominal discomfort, and cramping 2
- Cost-effective at $10-45 per month 2
Important Caveats
Do not combine with starch-based thickeners used for dysphagia, as this can create a choking hazard 1
Titration approach: If 17 g daily is insufficient after several days, the dose can be increased based on response, though there is no established maximum dose 2. In clinical practice, doses up to 34 g daily are commonly used for refractory constipation.
Note on product naming: Lax-a-Day contains polyethylene glycol 3350 (PEG 3350), the same active ingredient as MiraLAX 1. The question mentions "docusate sodium" in the expanded context, but this is incorrect—Lax-a-Day does NOT contain docusate sodium. Research shows docusate sodium is largely ineffective for constipation 3, 4, 5, 6, 7, and the guidelines do not recommend it 2.