Anat Ashkenazi
Chief Financial Officer at Eli Lilly and Company
Thanks Dave. Slide six and seven summarize financial performance in the fourth quarter and full year 2022. I'll focus my comments on non-GAAP performance. As Dave mentioned, we're pleased to report 10% growth for our core business in Q4 on a constant currency basis, driven by strong volume growth. A couple of notable items affected year-over-year comparisons. The first is COVID-19 antibody revenue in Q4 2022, which compared to the prior year declined 96% from approximately $1.1 billion in Q4 2021 to $38 million in Q4 2022. Biptimozumab is currently not authorized for emergency use in any US region and we continue to expect no COVID-19 antibody revenue for 2023. Second is the continued foreign exchange headwinds compared to 2021, which resulted in a 45-basis point dampening of revenue growth in Q4. Key growth products grew by 21% and accounted for 70% of our revenue this quarter. For the full year 2022, revenue excluding revenue from COVID-19 antibodies grew 2% or 5% on a constant currency basis.
Our non-GAAP gross margin was 80.5% in Q4, an increase of approximately 440 basis points, primarily driven by lower sales of COVID-19 antibodies, partially offset by lower realized price and increased expenses due to inflation and logistics costs. Total operating expenses declined 1% in Q4, lower acquired IPR&D and development milestone charges were largely offset by higher marketing, selling, and administrative expenses and higher R&D expenses. Marketing, selling, and administrative expenses increased 3% in Q4, primarily driven by costs supporting the launch of new products and indications, partially offset by the favorable impact of foreign exchange rates. R&D expense for the quarter increased 5%, driven by higher development expenses for late-stage assets, partially offset by favorable impact of foreign exchange rates. Operating income declined 7% compared to Q4 2021, driven by lower revenue, partially offset by lower operating expenses. Operating margin for Q4 was 27.4%, which includes a negative impact of approximately 330 basis points attributed to acquired IPR&D and development milestone charges. Full year operating margin was 27.8% an increase from 26.8% in 2021.
Our Q4 effective tax rate was 7.3%, bringing our full year 2022 effective tax rate to 10.3%. As we shared during our guidance call in December, we had assumed that the 2017 Tax Act provision for requiring capitalization, amortization of research, and development expenses for tax purposes would be deferred or repealed by Congress in late 2022. However, no legislative action was taken related to this provision, which resulted in a lower effective tax rate for 2022 versus the guidance range previously shared. In addition this provision did increase our tax payments in 2022 by approximately $1.2 billion. At the bottom-line earnings per share declined 4% in Q4 and increased 7% for the full year. On slide eight, we quantify the effect of price rate and volume on revenue growth across key geographies. This quarter US revenue declined 10%. Excluding revenue from COVID-19 antibodies, revenue grew 11% in the US. The swap volume-driven growth was led by Verzenio, Mounjaro, and Jardiance. Net price was flat in the US this quarter. For the full year, the net price decrease of 3% in the US was in line with our expectation.
Moving to Europe. Revenue in Q4, increased 8% in constant currency driven primarily by volume growth for Jardiance Trulicity and Verzenio. We remain encouraged with the momentum of our business in Europe. In Japan, revenue in Q4 decreased 6% in constant currency. Revenue growth in Japan continues to be negatively impacted, albeit less so than in prior quarters by decreased demand for several products that have lost patent exclusivity including, the Alimta and Cymbalta. We expect to return to growth this year, as we scale key products and launch Mounjaro. In China, revenue grew 2% in constant currency, as continued volume growth was mostly offset by lower realized prices for Humalog, as a result of the volume-based procurement process and for products listed on the NRDL as well as by COVID-19 disruption. Revenue in the Rest of the World increased 11% in constant currency this quarter, driven by approximately $130 million of onetime revenue associated with the sales of the company's right to Alimta in Korea and Taiwan.
As shown on slide nine, our key growth products continue to drive robust worldwide volume growth, contributing 15% points of volume growth this quarter. As mentioned previously, the decline in COVID-19 antibody volume, was substantial in Q4 2022 and was largely offset -- and largely offset volume growth from key products. While we will face similar prior period headwinds from COVID-19 antibody revenue through the first three quarters of 2023, our long-term growth prospects are underpinned by our innovative pipeline and key growth products including Mounjaro. slide 10, further highlights the contributions of our key growth products. This quarter these brands grew 21% or 27% in constant currency generated $5.1 billion in sales and made up 70% of our total revenue. While Lilly's incretins portfolio understandably generates high interest, we continue to see tremendous growth both in percentage and absolute terms, for other key products including Verzenio and Jardiance.
Verzenio sales in the quarter grew 100%, driven mainly by the edge of an indication. Jardiance sales grew 42% and the product retains the leadership position, in a competitive market globally. Demand for our incretins portfolio remains strong both for Trulicity globally and Mounjaro in the US, and we remain focused on bringing additional capacity online to meet this robust demand in upcoming launches. In terms of supply, as mentioned in our guidance call in December, given strong demand for incretins products. There have been intermittent delays at wholesalers and pharmacies and receiving certain doses levels of Mounjaro and Trulicity in the US. We continue to update the FDA on the situation, and the FDA has been posting to his website details regarding affected doses and expected timing. To meet this rapidly growing demand across our incretins business, we have announced plans to add additional, substantial capacity in the years ahead. The most proximal of these efforts, is our RTP side North Carolina where progress continues as planned and we look forward to the start of production later this year.
Moving to slide 11. Mounjaro's strong launch uptake continues, underpinned by differentiated efficacy profile, and positive customer experiences. For Q4, approximately 75% of Mounjaro's new therapy starts, are patients new to the type two diabetes injectable incretins class and further 10% of switches from Trulicity. As we mentioned in our Q3 earnings call in early November, we took actions in Q4 to reinforce the intended use of the Mounjaro savings program, by type two diabetes patients. We indicated at that time that these actions could negatively impact new prescription volumes, but were not expected to impact net revenue. As anticipated, we believe the new prescription volumes beginning in late November were impacted by these actions with some week-by-week volatility driven by end of year seasonality. We continue to build payer access for Mounjaro for type two diabetes. As of January 1st AXIS [Phonetic] stands just over 50% for patients with type two diabetes across commercial and Part D. Regarding the percentage of paid scripts. For Q4 we estimate the percentage of paid script from Mounjaro to be approximately 40% with paid script defined as those prescription outside the 25 non-covered co-pay cards, but inclusive of the 25 covered co-pay card. As we expand payer access, the proportion of paid scripts should continue to increase.
On slide 12, we provide an update on capital allocation. In 2022, we invested $9.6 billion to drive future growth through a combination of R&D expenditures, business development outlays and capital investment. In addition, we returned approximately $3.5 billion to shareholders in dividends and repurchased $1.5 billion in stock. Our capital allocation priorities remain unchanged and are oriented towards achieving our strategic deliverables of top-tier revenue growth and speeding life changing medicines to patients. We do this through investments in our current portfolio to drive new launches, investment in our manufacturing capacity in our future innovation through R&D and business development. And we returned capital to shareholders through dividend payments and share repurchases. slide 13 provides an updated 2023 financial guidance. The only change we've made from the guidance we provided in December is to update our effective tax rate, which result in an updated EPS range.
During December guidance call, we shared that the effective tax rate for 2023 would be approximately 16% based on the assumed deferral or repeal of the tax provision requiring capitalization of R&D. Since this provision was not deferred or repealed in 2022 and given the uncertainty around if and when such action will take place in 2023, we have updated our tax rate from 16% to approximately 13%. This update to our effective tax rate results in new EPS range of $7.90 to $8.10 on a GAAP basis and $8.35 to $8.55 on a non-GAAP basis. Regarding FX rates there has been a general weakening of the dollar since we set our initial 2023 financial guidance last year. However, we're not adjusting guidance for FX changes at this time as we're only one month into the year and FX markets can be quite volatile. As I shared in December, the most significant headwind in revenue growth in 2023 versus 2022 will be the impact of COVID-19 antibody sales. This year-over-year comparisons will be most pronounced in Q1 2023 given that we had $1.5 billion of COVID-19 antibody sales in Q1 2022.
To a lesser extent the loss of exclusivity of Alimta in the US in Q2 2022 will also impact year-over-year growth in the first half of 2023. Still the midpoint of our 2023 revenue guidance range represents roughly 7% of growth or 50% growth for our core business excluding COVID-19 antibodies. This year holds tremendous promise for us to help patients as we execute on the current wave of potential launches while maintaining our commitment to invest in and progress future innovation. We expect this ongoing focus on disciplined execution and investment will help drive top two revenue growth through 2030.
Now, I will turn the call over to Dan, to provide an update on our pipeline.