There's a Chemists' Own for that

Chemists’ Own® Macrogol with Electrolytes 30 sachets

Effective relief from constipation.

Alternative to Movicol® with Electrolytes.

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  • Constipation

Each 13.71 g sachet contains:

Macrogol 3350 13.125 g
Sodium chloride 350.7 mg
Sodium bicarbonate 178.5 mg
Potassium chloride 46.6 mg

DOSAGE (adults and children over 12 years of age): constipation: 1 sachet daily, increasing to 2 or 3 sachets daily, if necessary.
Faecal impaction (as diagnosed by a doctor): 8 sachets a day for up to 3 days.
DIRECTIONS FOR USE:
Dissolve the contents of one sachet in 125 mL of water, then drink it. Do not exceed the stated dose.
Not recommended for children less than 12 years of age.
Prolonged use of laxatives is undesirable and may lead to dependence. If symptoms persist see your doctor.