Osama Eldessouky
Analyst · Wells Fargo
Thank you, Brent, and good morning, everyone. Before we begin, please note that most of my comments today will be focused on growth expressed in constant currency basis.
Turning now to our financial results on Slide 8. We're pleased to report another quarter of solid revenue growth across each of our segments and key product franchises. Our business has continued the momentum coming out of 2023, and we're off to a strong start in 2024.
Total company revenue of $1.099 billion for the quarter, reflects growth of 20% on a constant currency basis. As I have previously discussed and as Brent also mentioned, we're excited about the opportunity ahead of us in 2024 with the growth of recent launches and new and upcoming products.
We're continuing to make improvements in our supply chain and we remain focused on executing our strategy to drive revenue growth and sustainable margin expansion. For the first quarter, currency was a headwind of $20 million to revenue. Despite the higher-than-expected currency headwinds, we delivered more than $1 billion in revenue in the quarter.
Now let's discuss the results in each of our segments. Vision Care first quarter revenue of $635 million increased by 11% on a constant currency basis, driven by growth in both the consumer and contact lens portfolios. The consumer business again demonstrated strong performance, both in the U.S. and internationally, with growth of 15% on a constant currency basis in Q1.
We continue to see growth across our key franchises, including eye vitamins, which grew by 7% in the quarter and Lumify, which grew by 16% in the quarter, both expressed in constant currency. Our consumer dry eye portfolio delivered $82 million in revenue in the quarter, representing 25% organic growth.
The contact lens constant currency revenue growth was 6%. The reported revenue from our Daily SiHy lenses grew by 68% in the quarter and 73% on a constant currency basis. Our Daily SiHy multifocal lens has now been launched in the U.S. and Japan, and has added to the solid performance of the Daily SiHy sphere. We're excited by the growth of this franchise as we continue the global rollout and further expand the family with the upcoming launch of the Daily SiHy toric.
Moving now to the Surgical segment. First quarter revenue was $197 million, an increase of 8% on a constant currency basis. The consumables portfolio grew in the quarter by 9% on a constant currency basis. The growth was mainly driven by surgical packs, where we continue to see solid demand.
Implantables grew 9% for the quarter on a constant currency basis with our premium IOL portfolio up 30% in constant currency. The IOL portfolio continues to expand with the recent U.S. launch of enVista Aspire, which has made a strong market entry along with the growth of the LuxSmart EDOF lens in Europe and the phased launch of ICH, which has been limited by supply constraints.
Revenue from equipment was up 5% on a constant currency basis, mainly driven by Stellaris system sales. We continue to focus our strategy on retailing upcoming product launches and higher-margin premium categories. We expect to see a steady stream of these launches over the next number of years, which we anticipate will drive revenue growth and sustainable margin expansion.
Lastly, revenue in the Pharma segment was $267 million for the quarter, which represents constant currency growth of 66%. Miebo delivered $28 million of revenue in the quarter. The launch performance remains incredibly positive, and we're committed to making the investments to drive the stronger adoption.
Xiidra delivered $79 million in revenue in the first quarter. We continue to make progress in executing our strategy to reestablish Xiidra as a market leader. The Xiidra field force was realigned in the quarter, and we have turned the direct-to-consumer marketing investment back on.
Although not material to the company's overall results, it's worth noting that the performance of Xiidra was negatively impacted by the disruptions resulting from the cyber attack at Change Healthcare. However, we saw an improvement in scripts, as we exited the quarter and transition to other vendors.
Brent will elaborate on this, but I want to stress that. Xiidra and Miebo together position us as a leader in dry eye disease, and we're excited about delivering on their full potential. Beyond Miebo and Xiidra, we saw strong growth across other parts of the pharma portfolio. On a constant currency basis, the U.S. generics business grew by 10% and international pharma grew by 7%. As expected, Prolensa declined due to a generic entry into the market during the quarter.
Now let me walk through some of the key non-GAAP line items. Adjusted gross margin for the first quarter was 63.2%, which was up 320 basis points compared to Q1 '23. The adjusted gross margin improvement was mainly driven by favorable product mix, including Xiidra. This was balanced by pressure driven by the higher inventory costs in our Surgical business.
In the first quarter, we invested $81 million in adjusted R&D or approximately 7% of revenue. First quarter adjusted EBITDA was $180 million, which represents 28% growth versus the first quarter of 2023. Net interest expense for the quarter was approximately $96 million. Adjusted EPS for the quarter was $0.07. Adjusted cash flow from operations was $48 million in the first quarter, and CapEx was $67 million. The effective tax rate for the quarter was 15%.
Turning now to our 2024 guidance on Slide 12. We are raising our full year constant currency revenue growth guidance from a range of approximately 12% to 14%, to a range of 30% to 50%. The raise reflects the broad-based strength of our business and the momentum we have seen in the first quarter.
Our 2024 revenue guidance remains in the range of $4.6 billion to $4.7 billion. This range now absorbs incremental currency headwinds of approximately $50 million relative to our previous guidance. For the full year, we estimate currency headwinds to be approximately $90 million. We are maintaining our guidance for Xiidra to generate approximately $400 million in revenue. Our guidance for Miebo continues to be approximately $95 million of revenue in 2024.
Shifting to adjusted EBITDA. We are maintaining our adjusted EBITDA guidance for 2024 in the range of $840 million to $890 million, while absorbing approximately $10 million of currency headwinds. Our focus continues to remain on sustainable margin expansion. We expect the expansion to be mainly driven by our strategy to shift mix to high-margin products, our efforts to continue to drive operational excellence and our focus on maintaining cost discipline.
As we continue to make investments to fully capture the value potential ahead of us, we expect to sustainably build on the margin expansion in 2024 over multiple years with the growth of our recent and upcoming launches. Our Q1 results reflects the phasing we noted during our last earnings call. And I would once again emphasize that there is natural seasonality in our business. We expect our business to build throughout the remainder of the year, with Q4 results expected to be the highest.
As I mentioned during our last earnings call, as we continue to drive pipeline innovation, we may enter into collaborations with external partners. It should be noted that our adjusted EBITDA guidance does not reflect any onetime upfront payments that may be made as part of such arrangements.
In terms of other key assumptions underlying our guidance, as noted in the last quarter, we expect adjusted gross margin to be approximately 62%. We anticipate investment in R&D to be approximately 7% to 8% of revenue, and interest expense to be approximately $385 million for the full year. That said, we will continue to monitor Fed actions on interest rates for the remainder of 2024.
We continue to expect our adjusted tax rate to be roughly 15% and full year CapEx is expected to be approximately $250 million. To summarize, the business delivered solid results in the quarter, and we're off to a strong start in 2024. We remain committed to our strategy to drive growth and sustainable margin expansion.
And now I'll turn the call back to Brent.