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Zealand touts promising tolerability data for obesity drug in mid-stage study

By Thomson Reuters Jun 5, 2026 | 3:47 PM

June 5 (Reuters) – Zealand Pharma said on Friday its experimental obesity drug, co-developed with Swiss partner Roche, showed encouraging tolerability in a mid-stage trial, bolstering its push to ​take on market leaders with a potentially gentler alternative ‌to existing blockbuster treatments.

Here are some details:

• Denmark’s Zealand said only 1.5% of patients who received once-weekly subcutaneous injections of the drug, petrelintide, discontinued treatment due to gastrointestinal side effects, based on results presented at the American Diabetes ‌Association ​meeting in New Orleans.

• Most gastrointestinal ⁠side effects, including nausea and ⁠vomiting, were mild.

• About 19.6% of patients experienced nausea and 3% reported vomiting, compared with 6.2% in the placebo group. Fewer than 7.5% of patients in both groups reported diarrhea ​or constipation.

• Petrelintide also improved key cardiovascular risk factors, including reducing levels of a protein linked to inflammation, lowering waist circumference ⁠and triglycerides, a type of fat, ⁠more than placebo.

• Zealand had reported in March ​that petrelintide drove weight loss of up to 10.7% over 42 ​weeks in a 493-patient study.

• Those results, however, fell short ‌of investor expectations, erasing billions of dollars from the company’s market value after trailing data of a rival amylin-based candidate from Eli Lilly showed up to 20.1% weight loss in a comparable ⁠mid-stage trial.

• Zealand is seeking to break into the lucrative obesity drug market, betting that its medicines could offer fewer and less severe ⁠side effects than blockbuster ‌treatments Zepbound and Wegovy from market leaders ⁠Lilly  and Novo Nordisk .

• Unlike Wegovy and Zepbound, ​which target ‌the GLP-1 hormone to reduce appetite, amylin-based ​drugs such as ⁠petrelintide, activate receptors in the brain and slow gastric emptying with the potential for less severe side effects and preservation of muscle.

• Roche gained access to petrelintide through an up to $5.3 billion collaboration and licensing deal last year.

(Reporting by Mariam Sunny in Bengaluru; Editing ​by Shilpi Majumdar)