On The Pen GLP-1 News

Eli Lilly’s fight over retatrutide may be about much more than one obesity drug.I’ve been covering retatrutide since early 2023, and since late 2024 I’ve been closely following the legal fight over whether reta should be treated as a biologic. From the beginning, I’ve argued that this case could have consequences far beyond retatrutide itself.In this episode, I break down the growing unauthorized retatrutide market, the serious adverse events and death reports now entering the conversation, Lilly’s repeated legal actions against sellers, the restricted Seventh Circuit filings, and new context I’ve heard from someone connected to senior HHS policy discussions.The biggest question is no longer simply what happens to retatrutide. It’s whether this case could help shape how future peptide medicines are classified, regulated, and protected.I’m continuing to track the Seventh Circuit docket and work on the restricted filings. If those documents become available or I can independently confirm what is in them, subscribers at obesity.news and OnThePen.com will hear about it first.This episode is brought to you by VoaFit and Trilogiii Daily Essentials. Check the links in the show notes, and use code OTP10 for Trilogiii.Visit Trilogiii: https://triii.life/tiers/daily-essentials?utm_source=onthepen&utm_medium=influencer&utm_campaign=dave_knappVisit Voafit: https://www.voafit.com/otp

Zepbound isn’t just changing people’s weight. GLP-1 medications are beginning to change America itself.

Restaurants are rethinking what they serve. Grocery baskets are changing. Food companies are paying attention to protein and portion size. Employers and insurers are wrestling with the enormous cost of covering obesity treatment. And pharmaceutical companies are spending billions trying to build the drugs that come after Zepbound.

This week on On The Pen, The Weekly Dose, we’re connecting those dots.

We get into the next generation of obesity medicines, including retatrutide, eloralintide, amylin combinations and oral GLP-1s, plus the growing race to preserve muscle while producing even greater weight loss.

But there is another side to this story.

As the science gets better, access may actually be getting worse. Coverage restrictions are forcing patients off medications that work, employers are reconsidering GLP-1 benefits, and we’re approaching a strange moment where medicine may finally have extraordinarily effective treatments for obesity while millions of people still can’t afford them.

And then there’s McDonald’s.

When one of the largest restaurant companies in the world starts thinking differently about what consumers want in the GLP-1 era, this isn’t just a pharmaceutical story anymore.

It’s a cultural one.

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In this episode: Retatrutide • Zepbound • Mounjaro • Ozempic • Wegovy • Eloralintide • Oral GLP-1s • Amylin • Muscle preservation • GLP-1 insurance coverage • The changing American food industry

This content is for informational purposes and is not medical advice.

This week on On The Pen, The Weekly Dose, we break down one of the biggest weeks in obesity medicine coming out of EASD 2026.Eli Lilly says Zepbound may still outperform Wegovy 7.2 mg, even after Novo Nordisk tripled the familiar maintenance dose, but the details are more complicated than the headline. We dig into the difference between the treatment-regimen and efficacy estimands, and why this was not a true head-to-head trial.We also cover Novo Nordisk’s $2.6 billion bet on a potential once-weekly oral GLP-1/GIP, new Foundayo data against high-dose oral semaglutide, Viatris and Mylan’s renewed patent fight over the future of generic Wegovy, and the full Phase 3 retatrutide publication in the New England Journal of Medicine.Plus, after weeks of concern over GLP-1 medications and NAION-related vision loss, we look at one practical thing patients may be able to do right now to better understand their own baseline risk.This episode is about more than who “wins” between Lilly and Novo. It is about what the data actually says, where the next generation of obesity treatment is headed, and what all of this means for patients trying to make informed decisions with their doctors.Covered in this episode: Zepbound vs. Wegovy 7.2 mg, retatrutide TRIUMPH-1 Phase 3 data, Foundayo/orforglipron, oral semaglutide, once-weekly oral GLP-1s, generic Wegovy patent litigation, NAION, GLP-1 vision risk, EASD 2026, Eli Lilly, Novo Nordisk, Viatris and Mylan.Subscribe for breaking GLP-1, obesity, diabetes and metabolic-health news, explained from the patient perspective.Get Exclusive OTP Savings and Resrouces:Https://www.otplinks.comGet Breaking Obesity Medicine News:HTTPS://www.onthepen.com

This week on On The Pen, The Weekly Dose Podcast, retatrutide heads into a major federal court fight as the Department of Justice gives FDA fresh legal ammunition just days before oral argument.
At the same time, FDA is escalating its scrutiny of mass GLP-1 compounding, with a warning letter to Empower Pharmacy that could have major implications for semaglutide, tirzepatide, telehealth prescribing, and patient access.
We also break down Viking Therapeutics’ new VK2735 maintenance data, including early weight-loss numbers that are starting to draw retatrutide comparisons and the possibility of every-other-week or even monthly maintenance dosing.
Plus, Roche’s enicepatide, formerly CT-388, just posted a 2.65 percentage-point A1C reduction and 15.5% weight loss in people with type 2 diabetes and obesity, raising new questions about how competitive the next generation of GLP-1/GIP drugs may become.
This episode is about more than one drug. It is about where obesity medicine is heading, who gets access, how regulators are drawing the lines, and why the next few years may look very different from the market we know today.

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Lilly just gave us a glimpse of what could come after today’s GLP-1s, and it may not be about simply pushing patients to stronger drugs and higher doses.

This week on On The Pen: The Weekly Dose, we break down Lilly’s surprising early data combining just 5 mg of tirzepatide with 3 mg of eloralintide, producing roughly 17% weight loss in only 16 weeks. Could combinations like this eventually approach retatrutide-level efficacy with better tolerability? And when retatrutide reaches the real world, how many patients will actually need or tolerate the higher doses responsible for its biggest clinical-trial numbers?

We’re also digging into the bigger stories shaping the future of obesity medicine, including new research suggesting semaglutide may influence aging beyond calorie restriction in mice, the emerging race to preserve lean mass during GLP-1 weight loss, apitegromab’s eye-popping price, Lilly’s legal battle over retatrutide’s classification, the underground market already selling unapproved Reta, and the latest development in Lilly’s lawsuit against Mochi.

The science is getting better incredibly quickly. The bigger question may be whether we can deliver enough efficacy, tolerability and muscle preservation at a price patients can actually access.

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