Existing meds have limitations
The existing medical treatments, orlistat and phentermine, both have significant drawbacks that limit their use. Orlistat (Xenical, Alli), FDA approved for adolescents 12-16 years old since 2003, limits intestinal fat absorption and as a result often produces unwanted GI effects. Phentermine’s approval for older adolescents dates from 1959 and has a weak evidence base, its label limits it to “short-term” use that’s generally taken to mean a maximum of 12 weeks. And, as a stimulant, phentermine has often been regarded as potentially dangerous, although Dr. Kelly noted that stimulants are well-accepted treatments for other disorders in children and adolescents.
Liraglutide gives adolescents with obesity an edge in managing weight loss
“The earlier we treat obesity in youth, the better, given that it tends to track into adulthood,” agreed Dr. Caprio. “However, it remains to be seen whether weight reduction with a pharmacological agent is going to help prevent the intractable trajectories of weight and its complications. So far, it looks like surgery may be more efficacious,” she said in an interview.
Another drawback for the near future with liraglutide will likely be its cost for many patients, more than $10,000/year at full retail prices for the weight-loss formulation, given that insurers have had a poor record of covering the drug for this indication in adults, both Dr. Caprio and Dr. Kelly noted.
Compliance with liraglutide is also important. Dr. Kelly’s study followed patients for their first 26 weeks off treatment after 56 weeks on the drug, and showed that on average weights rebounded to virtually baseline levels by 6 months after treatment stopped.
Obesity treatment lasts a lifetime
“Obesity is a chronic disease, that requires chronic treatment, just like hypertension,” Dr. Kelly stressed, and cited the rebound seen in his study when liraglutide stopped as further proof of that concept. “All obesity treatment is lifelong,” he maintained.
He highlighted the importance of clinicians discussing with adolescent patients and their families the prospect of potentially remaining on liraglutide treatment for years to maintain weight loss. His experience with the randomized study convinced him that many adolescents with obesity are amenable to daily subcutaneous injection using the pen device that liraglutide comes in, but he acknowledged that some teens find this off-putting.
For the near term, Dr. Kelly foresaw liraglutide treatment of adolescents as something that will mostly be administered to patients who seek care at centers that specialize in obesity management. “I’ll think we’ll eventually see it move to more primary care settings, but that will be down the road.”
The study of liraglutide in adolescents was sponsored by Novo Nordisk, the company that markets liraglutide (Saxenda). Dr. Kelly has been a consultant to Novo Nordisk and also to Orexigen Therapeutics, Vivus, and WW, and he has received research funding from AstraZeneca. Dr. Caprio had no disclosures.