Comparative Pharmacology
Head-to-head clinical analysis: MIRALAX versus PEG 3350 AND ELECTROLYTES.
Peer-Reviewed Evidence
Head-to-head clinical analysis: MIRALAX versus PEG 3350 AND ELECTROLYTES.
MIRALAX vs PEG 3350 AND ELECTROLYTES
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Polyethylene glycol 3350 (PEG 3350) is an osmotic laxative that works by retaining water in the stool through hydrogen bonding, increasing fecal water content and promoting bowel movements.
PEG 3350 is an osmotic laxative that retains water in the bowel lumen via hydrogen bonding, increasing fecal water content and stimulating peristalsis. Electrolytes (sodium sulfate, potassium chloride, sodium bicarbonate, magnesium sulfate) prevent significant fluid and electrolyte shifts by maintaining isotonicity.
17 g (1 heaping tablespoon) dissolved in 4–8 oz of water, juice, soda, coffee, or tea, administered orally once daily. Maximum duration of use: 7 days.
4 liters orally of the reconstituted solution administered as a single dose at 240 mL every 10 minutes or 1 to 1.5 L/hour until rectal effluent is clear. Alternatively, 240 mL every 10 minutes until 4 L consumed.
None Documented
None Documented
Not applicable; polyethylene glycol 3350 is minimally absorbed and systemic half-life is not clinically relevant.
Not applicable; PEG 3350 undergoes minimal systemic absorption (<0.2%), thus no meaningful terminal half-life. Systemic half-life of absorbed fraction is <2 hours.
Primarily excreted unchanged in feces (>90% of oral dose); negligible renal elimination (<0.1% recovered in urine).
Primarily fecal (96–98%) as unabsorbed PEG 3350; electrolytes absorbed are excreted renally (sodium, potassium) and via feces (biliary excretion negligible).
Category C
Category C
Osmotic Laxative
Osmotic Laxative