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Medication side effect

Can Lactulose cause constipation?

Osmotic Laxative [EPC]

Yes — constipation has been reported as a side effect of Lactulose in FDA adverse-event reports (FAERS) and product labeling. It is among the more frequently reported events for this medication. These are voluntary reports, so they show what's been reported, not how often it happens.

Reported adverse reactions

ADVERSE REACTIONS Precise frequency data are not available. Lactulose may produce gaseous distention with flatulence or belching and abdominal discomfort such as cramping in about 20% of patients. Excessive dosage can lead to diarrhea with potential complications such as loss of fluids, hypokalemia, and hypernatremia. Nausea and vomiting have been reported. To report SUSPECTED ADVERSE REACTIONS, contact Apozeal Pharmaceuticals Inc. at 1-833-688-7848 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Warnings

WARNINGS A theoretical hazard may exist for patients being treated with lactulose solution who may be required to undergo electrocautery procedures during proctoscopy or colonoscopy. Accumulation of H 2 gas in significant concentration in the presence of an electrical spark may result in an explosive reaction. Although this complication has not been reported with lactulose, patients on lactulose therapy undergoing such procedures should have a thorough bowel cleansing with a non-fermentable solution. Insufflation of CO 2 as an additional safeguard may be pursued but is considered to be a redundant measure.

Other reported side effects of Lactulose

nauseafallvomitingfatiguedyspneadiarrhea

Frequently asked questions

Is constipation a side effect of Lactulose?

Yes — constipation has been reported as a side effect of Lactulose in FDA adverse-event reports (FAERS) and/or its labeling. These are voluntary reports, so they show what's been reported, not how often it happens.

How common is constipation with Lactulose?

constipation is among the more frequently reported events for Lactulose in FAERS. Reporting volume isn't a true incidence rate — check the prescribing information for documented frequencies.

What should I do if I have constipation while taking Lactulose?

Don't stop a prescribed medication on your own. Tell your prescriber or pharmacist — they can tell you whether it's expected, whether it needs attention, and what to do next.

Informational only, drawn from FDA adverse-event reporting (FAERS) and labeling — not medical advice, and not proof a medication caused an effect. Talk to your clinician or pharmacist about any side effect.

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