Mounjaro is Eli Lilly's branded tirzepatide for type-2 diabetes — the diabetes twin of Zepbound. The drug carries the same active ingredient as Zepbound, and the SURPASS Phase 3 program established it as a high-efficacy GLP-1/GIP option for glycemic control.
Key reads on this site: Mounjaro real-world data presented at OMA 2026 and elsewhere tracking with SURPASS-1 through SURPASS-5, the SURMOUNT-5 head-to-head against semaglutide that confirms the dual-agonist edge in obesity (and translates to T2D weight outcomes), and the kidney and HFpEF readouts that have broadened the cardiometabolic case.
Mounjaro became the world's #1 best-selling drug in Q1 2026 ($8.66B vs Keytruda's $7.9B), and the combined Mounjaro+Zepbound franchise now holds about 54.8% of US GLP-1 prescription share — up from 47% a year earlier. Q1 2026 YoY growth was 125% for Mounjaro and 80% for Zepbound, with Lilly raising 2026 revenue guidance to $82-85B.
Mounjaro sits alongside Zepbound on the FDA's April 30, 2026 proposal to exclude tirzepatide from the 503B bulks list. Stories here cover the trial data, payer coverage, market share, and the compounding fight.
Sandoz Group announced Monday June 29, 2026 that the FDA accepted two Abbreviated New Drug Applications (ANDAs) from the company for generic versions of Eli Lilly's tirzepatide autoinjectors, covering the type-2-diabetes-labeled Mounjaro and the obesity-labeled Zepbound. The ANDAs cover all approved indications of Mounjaro and Zepbound. If approvals land, Sandoz would launch 'one of the first generic tirzepatide products' in the US, adding real supply-side competition to Lilly's branded product and creating pricing pressure that could reshape the Medicare GLP-1 Bridge economics. The company developed the generic tirzepatide in-house, combining Sandoz's small-molecule and device-development experience with its biosimilar expertise. The ANDA acceptance does not include a projected FDA action date; typical generic-tirzepatide review timelines run 12 to 24 months, putting a potential Sandoz launch window in 2027-2028. The competitive-pressure question is whether generic tirzepatide substitution would apply at the pharmacy counter under the Bridge (the program covers Zepbound KwikPen brand-specifically) or only in the broader Part D market post-Bridge.
Eli Lilly confirmed in reporting on June 22-23, 2026 that it is halving its planned €2.3 billion (US$2.7 billion) investment at the under-construction Alzey, Rhineland-Palatinate injectable manufacturing site, reducing planned headcount from approximately 1,000 to 500 and pushing the redirected capital toward US sites, most likely Lilly's Pennsylvania facility. The plant produces injectable GLP-1 drugs Mounjaro (tirzepatide for type-2 diabetes), Zepbound (tirzepatide for obesity), and Trulicity (dulaglutide), and is still scheduled to open in 2027 at the reduced capacity. Lilly cited Germany's proposed healthcare reform legislation, particularly a 'dynamic manufacturer rebate' that would automatically lower drug reimbursements as utilization climbs. Boehringer Ingelheim is also slashing planned German investment by at least $1 billion, and Pfizer CEO Albert Bourla has signaled a reassessment. Lilly's CEO David Ricks told the German government the company 'can no longer commit to the full vision for Alzey.' The cut arrives the same week as STAT's retatrutide compassionate-use story, sharpening the contrast between Lilly's expanding US capital deployment and tightening European pricing.
Coverage week of June 15-19 distilled the post-ADA market share story: Eli Lilly's tirzepatide franchise (Mounjaro for T2D, Zepbound for obesity) now holds 54.8% of US GLP-1 prescription share versus 47% a year earlier, with Q1 2026 YoY growth of 125% for Mounjaro and 80% for Zepbound and full-year revenue guidance raised to $82-85B. Novo Nordisk lifted its own 2026 guidance to a 4-12% currency-adjusted decline (improved from 5-13%) on Wegovy pill momentum (3M US scripts in five months, 65% of new prescriptions, 82% to GLP-1-naive patients), but Novo's stock has declined 42% over the past year against Lilly's 40% gain — the share-shift signal the ADA cycle crystallized. Lilly's seven additional retatrutide Phase 3 readouts across 2026 (TRIUMPH-7 chronic low-back pain, TRIUMPH-8 general obesity, TRIUMPH-9 obesity without T2D, plus OSA, MASLD, and cardiometabolic outcomes) extend the franchise gap.
Wegovy and Mounjaro became reimbursable by French Health Insurance effective June 15, 2026 under orders published in the May 28, 2026 Journal Officiel. The patient co-payment rate is 35%, leaving 65% public coverage by the Sécurité Sociale. Eligibility is restricted to specific patient profiles: adults with BMI ≥30 plus a major obesity-associated comorbidity (Wegovy) or with type 2 diabetes (Mounjaro). The decision follows the UK and Switzerland in extending public insurance to GLP-1 obesity therapy, and marks a paradigm shift from 'personal responsibility' toward 'treatable disease' framing in continental European health systems. The change comes ahead of EMA Wegovy pill (oral semaglutide 25 mg) EU launches in H2 2026 following the May 22 CHMP positive opinion.
Bloomberg reported May 6 that Eli Lilly's Mounjaro displaced Merck's Keytruda as the world's best-selling pharmaceutical in Q1 2026 — $8.66B Mounjaro Q1 sales vs Keytruda's $7.9B Q1 sales. The Mounjaro+Zepbound combined tirzepatide platform generated $36.5B in 2025, outpacing Keytruda's $31.6B. Keytruda had held the #1 ranking since Q1 2023, when it displaced AbbVie's Humira. The shift is the first time a peptide therapeutic has taken the top spot since the historical run of insulin biosimilars. The narrative also frames Lilly's $4.5B Lebanon Indiana manufacturing recommitment and the broader $21B Indiana capital plan as the supply-chain answer to demand at that scale.
Eli Lilly shares climbed 6.11% on May 1 as the market digested the company's Q1 2026 print: $19.8B in revenue (+56% YoY), Mounjaro at $8.66B globally (+125%), Zepbound at $4.16B in U.S. sales (+80%), and reported EPS of $8.26 versus the $6.97 consensus. Multiple sell-side analysts revised price targets higher and reiterated or upgraded ratings, citing the strength of the cardiometabolic franchise and the $2 billion guidance raise to $82–85B. The reaction crystallized Lilly's positioning as the GLP-1 leader heading into Novo's May 6 Q1 print.
Eli Lilly reported Q1 2026 worldwide revenue of $19.8 billion, up 56% year over year on 65% volume growth partially offset by a 13% price decline. Mounjaro hit $8.66 billion globally (+125%), Zepbound delivered $4.16 billion in U.S. sales (+80%), and reported Q1 EPS jumped 170% to $8.26. Lilly raised 2026 revenue guidance by $2 billion at each end to $82–85 billion and lifted non-GAAP EPS guidance to $35.50–$37.00. The release also recapped five positive Phase 3 readouts, six new Phase 3 starts, and the closings of the Orna, Centessa, Colonia, and Ajax acquisitions in the quarter.
Morningstar issued a pre-earnings note ahead of Eli Lilly's April 30 Q1 2026 report raising fair value to $870 from $770 following 2025 results and management guidance. Analysts project 27% top-line growth in 2026 and 20% in 2027, with double-digit growth through end of decade. Mounjaro/Zepbound represented 56% of total sales in 2025, projected to exceed 60% in 2026 with patent protection through 2036. The Q1 print will be the first read on Foundayo launch trajectory after the disappointing 1,390 / 3,707 prescription weeks 1-2.
The first definitive Phase 3B head-to-head trial of Lilly's tirzepatide versus Novo Nordisk's semaglutide in 750 patients with obesity over 72 weeks showed tirzepatide produced 21.6% mean weight loss vs semaglutide's 15.4%. 36.2% of tirzepatide patients achieved ≥25% weight loss vs 19.4% on semaglutide. Results published April 20 give Lilly a clear comparative data point in the GLP-1 market share battle.
CNBC reports Eli Lilly's Indian GLP-1 market share fell from 61% to 56% in March as 26 generic semaglutide brands from 13 companies entered the market following patent expiry. Novo Nordisk held steady at 25% after slashing Ozempic prices 38% and Wegovy prices 48%, while Lilly's Mounjaro remains priced 10x above the cheapest generics.
Tirzepatide (Mounjaro) Indian sales fell to ₹114 crore in March from ₹135 crore in February, while semaglutide sales rose to ₹59 crore. Semaglutide's GLP-1 segment share jumped to 33% from 25% as dozens of generics flood the market.
Biopharma acquisitions surged in Q1 2026 with 14 deals over $500M. Eli Lilly earned $65.2 billion in 2025, roughly half from Mounjaro and Zepbound, fueling an industry-wide M&A wave.
Analysts expect Novo's aggressive cuts to capture the lion's share of India's GLP-1 market in 12-18 months. Eli Lilly's Mounjaro currently dominates with ~79% share vs Novo's ~21%.