My followers might recall my groundbreaking January 8, 2007 article (see that at https://blog.sstrumello.com/2007/01/business-of-diabetes-real-story-behind.html for more) which followed a long discovery process which began back in 2006 based upon a very simple question: the patents on biosynthetic insulin had expired, so why did Americans have no generic products to help reduce prices?
As it turned out, the answer was unnecessarily complicated. It was complicated by design from entities who benefitted from not having generic or biosimilar competition. And, I don't mean pharma as such, but from vertically-integrated (with commercial healthcare insurance companies) Pharmacy Benefit Managers (PBMs) who were behind the scenes, demanding ever-larger legally-exempt rebate kickbacks for preferred formulary positioning. Those demands for bigger rebates led to list-price inflation.
There were a variety of other factors involved, including the fact that insulin was the very first-ever biologic medicine which was approved back in 1982, but it had been regulated as a small-molecule "drug" whose manufacture just so happened to be regulated as the manufacture of a biologic medicine. Also, Federal lawmakers had not explicitly legalized copies of biologic medicines until Democrats in Congress (not a single Republican lawmaker voted for it) passed the Biologics Price Competition and Innovation Act (BPCIA) in 2019, which was a key provision of the Patient Protection and Affordable Care Act (aka Obamacare) which explicitly legalized biosimilar medicines in the first place, including outlining of procedures which must be followed by pharma to attain FDA approval.
But beyond that was the uncomfortable reality that FDA policy had still failed to recognize insulins which had originally been approved by FDA as small molecule "drugs" (which were manufactured as biologic medicines) were even eligible for biosimilar competition, and the FDA took nearly a decade after the Patient Protection and Affordable Care Act became law before it finally implemented policies to do that. It was under former Trump FDA Chief Scott Gottlieb that FDA finally did that in spite of being repeatedly prompted by lawmakers to do so, and only because the FDA itself had failed to implement those policies for nearly a decade. On the latter, it is believed that Lilly, Novo Nordisk and Sanofi had quietly encouraged their former colleagues then working at FDA to keep delaying those policies in an effort to prevent any competition from coming to market for as long as possible.
That said, what I originally referred to as "generic" (FDA referred to those "follow-on" biologics, which subsequently became known as biosimilars approved under a slightly different regulatory pathway at FDA) insulins eventually happened anyway.
Originally, the "follow-on" biologic insulins came to market first because FDA's own dysfunctional policy enabling biosimilars had not yet been formally implemented. Once FDA finally got its $#!+ together and implemented policies required under U.S. law, that finally enabled true biosimilars to come to market.
Which brings me to last week's FDA announcement (see https://www.fda.gov/news-events/press-announcements/fda-approves-first-rapid-acting-insulin-biosimilar-product-treatment-diabetes for the news release) that FDA had officially approved the first biosimilar copy of Novolog (insulin aspart injection, 100 units/mL) to be made by Sanofi Aventis LLC whose trade name will be known as Merilog (insulin aspart-szjj). Observe the color scheme used for Merilog: orange, which is the same color Novo Nordisk uses in boxes containing Novolog.
The FDA package insert (see https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/761325Orig1s000lbl.pdf for the insert itself) for Merilog includes proposed images (Sanofi will use the color orange also used by Novo Nordisk for Novolog for the newly-approved Merilog product, rather than the maroon color which it uses for the follow-on biologic branded as Admelog). The image is of the proposed box containing a 10 mL vial.
Sanofi already sells a copy of Lilly's Humalog (insulin lispro injection, 100 units/mL) sold under the brand/trade name "Admelog" which was approved by FDA on December 11, 2017 (see the FDA news release on that at https://www.fda.gov/news-events/press-announcements/fda-approves-admelog-first-short-acting-follow-insulin-product-treat-diabetes for more).
However, unlike Admelog, Merilog has been approved as a "biosimilar", rather than as a "follow-on biologic" medicine. The differences are that: a) the approval pathway at FDA was different for Admelog vs. Merilog, and b) as a "biosimilar", Sanofi could theoretically later seek a designation as "interchangeable" from FDA which would enable pharmacists to switch to Merilog without the prescribing doctor's permission unless the doctor designates the prescription "Prescribe as Written" or "No Substitution Permitted" on the prescription. The FDA approval of Merilog also brings a long-standing delay at FDA to a close. The FDA had only two previous insulins which were approved as "biosimilar" drugs, specifically Semglee (insulin glargine-yfgn) which was first approved by the FDA in June 2020 (and subsequently received approval as an "interchangeable biosimilar" to innovator Sanofi Lantus on July 28, 2021), and a second copy of Lantus made by Eli Lilly & Company, Inc. which is sold under the trade name Rezvoglar (insulin glargine-aglr) which received FDA approval in December 2021. This means that for three years, FDA had not rendered any decisions on biosimilar insulins, although truthfully, Covid-19 shutdowns delayed many FDA decisions.
To my knowledge, Sanofi only sells vials and Solostar prefilled pens of insulin, but it does not currently sell 3 mL cartridges of insulins as both Novo Nordisk and Lilly do (the latter sells pen cartridges only for certain varieties of prandial insulin analogues only) which would work with refillable, smart insulin pens such as Medtronic's InPen which automatically logs each dosage given with the pen enabling patients to easily track insulin on-board.
Of course, if PBMs are involved, they will just non-medically switch patients anyway by disregarding the FDA designation and calling the products "therapeutically equivalent" in order for the PBM to try and collect legally-exempted rebate kickbacks (although in 2023-2024, Lilly, Novo Nordisk and Sanofi all effectively opted-out of the rebate-contracting sales model for the insulin therapeutic class of drugs).
There is also a photo of the Solostar prefilled insulin pen on the package insert given to the FDA. Of note is that under Section 16, which is entitled "HOW SUPPLIED/STORAGE AND HANDLING", and more specifically under Section 16.1, where it describes "How Supplied," it says that MERILOG (insulin aspart-szjj) injection 100 units/mL (U-100) is available as a clear and colorless solution in one 10 mL multiple-dose vial per carton (which is assigned the NDC # 0024-5927-00), or in five 3 mL single-patient-use SoloStar prefilled pens per carton (which is assigned the NDC # 0024-5928-05). It also adds "The MERILOG SoloStar prefilled pen dials in 1-unit increments" (rather than 1/2 unit increments).
- Biocon Biologics, Inc. (in Feb. 2023, FDA denied Biocon's aspart biosimilar application with a Complete Response Letter (CRL), indicating that Biocon first needed to address some deficiencies which FDA had cited before FDA would approve it, and Biocon told investors that it intended to fix those things)
- Sandoz/Gan & Lee
- Civica, Inc.'s CivicaScript PBC operating unit/GeneSys Biologics
- Amphastar Pharmaceuticals/ANP
- Lannett Company, Inc./YiChang HEC ChangJiang Pharmaceutical Co., Ltd. [HEC]