LACTULOSE vs ZELNORM

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 20, 2026·How we rate

Possible drug interaction. LACTULOSE and ZELNORM are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	LACTULOSE	ZELNORM
Rating	68/100	New
Pharmacy pays	~$0.73 /30	—
Type	RX	RX
Active ingredient	LACTULOSE	TEGASEROD MALEATE
Manufacturer	Fresenius Kabi USA	Alfasigma
Dosage forms	Solution, Powder	Tablet
Drug class	Osmotic Laxative	—
Boxed warning	None	None
Treats	Constipation, Hepatic Encephalopathy	Constipation, Irritable Bowel Syndrome

lactulose zelnorm

Rating

68/100

New

Pharmacy pays

~$0.73 /30

—

Type

Active ingredient

LACTULOSE

TEGASEROD MALEATE

Manufacturer

Fresenius Kabi USA

Alfasigma

Dosage forms

Solution, Powder

Tablet

Drug class

Osmotic Laxative

—

Boxed warning

None

Treats

Constipation, Hepatic Encephalopathy

Constipation, Irritable Bowel Syndrome

Frequently asked questions

What is the difference between Lactulose and Zelnorm?

Lactulose contains Lactulose, while Zelnorm contains Tegaserod Maleate — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.