Macrogol 3350 Mayoly Spindler (Macrogol 3350)

Macrogol 3350 is an osmotic laxative indicated for conditions that require stool softening or bowel cleansing.

• Constipation: softens stool and increases water content to facilitate regular bowel movements.
• Bowel preparation for colonoscopy: clears intestinal contents to improve visualization during the procedure.
• Pre‑operative bowel cleansing: reduces fecal load before abdominal surgery, decreasing infection risk.
• Chronic idiopathic constipation: provides long‑term relief for patients with infrequent or difficult stools.

• Macrogol 3350 is a high‑molecular‑weight polyethylene glycol that is not absorbed from the gastrointestinal tract. It creates an osmotic gradient by retaining water within the intestinal lumen, which increases stool volume and softens consistency. The resulting distension of the colon stimulates peristalsis, promoting the transit of fecal matter toward evacuation. This mechanism operates without systemic exposure, minimizing metabolic interaction and systemic side effects.

Macrogol 3350 may cause a range of adverse reactions, most of which are mild and transient.

Common Side Effects

• Abdominal bloating: feeling of fullness or swelling in the abdomen.
• Flatulence: increased gas production leading to passing of wind.
• Diarrhoea: loose, watery stools occurring after dosing.
• Nausea: mild sensation of unease in the stomach.

Serious or Rare Side Effects

• Electrolyte imbalance: abnormal levels of sodium, potassium or other electrolytes.
• Severe dehydration: marked loss of body fluids requiring medical attention.

When using Macrogol 3350, certain precautions should be observed to ensure safe and effective therapy.

• Assess hydration status: ensure the patient is adequately hydrated before initiating therapy.
• Review renal function: adjust use in patients with severe renal impairment.
• Monitor electrolyte levels: watch for hyponatraemia or hypokalaemia during prolonged treatment.
• Avoid concurrent use with strong laxatives: may increase risk of diarrhoea and fluid loss.
• Discontinue if abdominal pain persists: seek medical evaluation for possible obstruction.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Macrogol 3350 can interact with other medicines, primarily by affecting absorption or fluid balance.

Major Interactions (Avoid)

• Absorption of oral medications: may reduce uptake of drugs such as digoxin, lithium, or oral antibiotics; separate dosing by at least 2 hours.
• Anticholinergic agents: combined use can diminish laxative effectiveness and increase constipation risk.

Moderate Interactions (Monitor Closely)

• Diuretics: concurrent use may exacerbate electrolyte disturbances; monitor serum electrolytes.
• NSAIDs: increased risk of renal impairment when combined with volume‑depleting effects.
• Opioid analgesics: may counteract the laxative effect, requiring dose adjustment or additional laxatives.