Daily How Much

For a 3-year-old, miralax is commonly started at 0.4 g/kg/day for maintenance, with higher short courses used for clean-outs when directed.

For a 2-year-old, pediatric dosing of MiraLAX uses PEG 3350 at 0.4–0.8 g/kg daily; get dosing from your child’s clinician.

For a 1-year-old, pediatric dosing of Miralax (PEG 3350) is 0.2–0.8 g/kg/day; use only with your pediatrician’s guidance.

For most adult preps, mix one 238-gram bottle of Miralax into 64 ounces of clear liquid and drink it in split doses as your doctor directs.

For Miralax colonoscopy prep, many plans use 238 g powder mixed with 64 oz clear liquid, split into two 32-oz doses.

Use 238 g Miralax in 64 oz clear liquid, split 32 oz evening, 32 oz 4–6 hours pre-procedure, for colonoscopy prep.

Most plans use 238 g MiraLAX mixed with 64 oz clear liquid, split between the evening before and 4–6 hours before colonoscopy.

For a colonoscopy, most prep sheets call for 238 g MiraLAX mixed into 64 oz of clear liquid, unless your clinician gives a different plan.

For adults, anything beyond 17 g (one capful) in a single day is outside label directions unless your clinician tells you otherwise.

Adults typically use 17 grams of Miralax once daily for constipation, mixed in 4–8 oz of liquid; kids need clinician-guided dosing.