Lactulose inactive ingredients?

Lactulose — What the “inactive” ingredients are

Lactulose is the active drug. Anything that is not the 15 %–30 % lactulose syrup (or the tablet‑grade powder) is considered an excipient or inactive ingredient.
The exact mix depends on the formulation (oral solution, powder‑in‑vial, tablets, etc.) and on the manufacturer. Below is a “quick‑look” list of the most common excipients you’ll find in the major lactulose products on the market today. Always check the product’s label or the patient‑information leaflet for the precise list that applies to the vial or bottle you have.

1. Oral Solutions (USP‑grade syrups)

Key take‑away:
All USP‑grade lactulose solutions are essentially “water + sodium salts.” There are no preservatives, dyes, or sweeteners in the official U.S. versions.

2. Powder‑in‑Vial (used in the U.K., EU, Canada)

3. Tablet / Powder (for home use)

Why lactose?
Lactose is a sweet, readily available filler that also helps keep the tablets from sticking together. Patients with a severe lactose intolerance or a milk‑protein allergy should check the label or discuss alternatives with their pharmacist.

4. Pediatric / Infant Preparations

How to Find the Exact List for Your Product

1. Check the patient‑information leaflet (PIL) – the most authoritative source.
2. Look at the vial or bottle label – in many countries (especially the U.S.) the excipients are printed on the outer packaging.
3. Ask your pharmacist – they can pull the exact ingredient list from the drug’s product dossier.
4. Use the manufacturer’s website – most pharma companies post a PDF of the “Label” or “Technical Data Sheet” that lists excipients.

Practical Tips

Bottom Line

• USP lactulose solutions are water + sodium hydroxide + sodium chloride.
• Tablet formulations often contain lactose, microcrystalline cellulose, starch, magnesium stearate, talc, and sometimes sodium lauryl sulfate.
• Pediatric syrups add glycerol for taste.

If you’re ever unsure or have a