Mark Plinio
Analyst · Morgan Stanley
Thanks, Mark, and good afternoon, everyone.
LINZESS has shown incredible resilience in the face of this pandemic, further strengthening its position as the #1 prescribed medicine in the U.S. for the treatment of adults with IBS-C or CIC. In fact, LINZESS leads all other brands in this category in total prescription share, achieving an all-time high of approximately 40% in September.
In addition to 7% prescription demand growth year-over-year, we have seen new-to-brand prescription demand continue to grow in the third quarter as well. As a reminder, beginning in late March at the start of the pandemic in the U.S., we saw a negative impact to new-to-brand prescriptions. Not surprisingly, fewer patients were going into the offices to see their physicians. We believe this, coupled with our decision to pause in-person promotion at that time, resulted in fewer new patients receiving prescriptions for LINZESS.
However, we believe the launch of our new DTC campaign in late spring, and our sales force beginning to return to the field, contributed to the rebound in new-to-brand prescription demand in the second quarter. This growth continued to strengthen in the third quarter, returning to pre-COVID-19 levels and outpacing the broader IBS-C and CIC branded prescription market.
In the third quarter, average new-to-brand prescription demand increased 10% compared to the second quarter. By comparison, the rest of the branded prescription market, in aggregate, grew new-to-brand prescriptions by 8% during the same period.
Another driver of prescription demand is the continued growth in the share of 90-day prescriptions, which now represent approximately 20% of total LINZESS prescriptions in the third quarter.
In the third quarter, total average LINZESS prescription size grew 4% year-over-year to 42 pills per prescription. And new LINZESS prescription size grew 5% to 46 pills per prescription.
As we have mentioned before, data suggests that compliance on LINZESS increases substantially with 90-day prescriptions as we believe patients with IBS-C are more likely to experience greater abdominal pain relief from LINZESS over the course of a 90-day prescription as compared to those on a 30-day prescription.
Since launch, our LINZESS commercial strategy has been focused on 3 core fundamentals: Increasing awareness of LINZESS among physicians, motivating appropriate patients to seek care, and securing broad payer access.
We believe it is our focus on these fundamentals and our ability to demonstrate strong execution against them that has supported the brand's success to date. We see additional drivers, including the return of our customer-facing employees, to the field, the overall abdominal symptoms sNDA approval and our innovative consumer efforts leveraging telehealth, helping to support continued growth moving forward.
First, by the end of the quarter, the combined Ironwood AbbVie field force was mostly back conducting in-person details in territories throughout the country. While reps' access to physician offices isn't where it was prior to the COVID-19 pandemic, it continues to increase, especially among the higher prescribing doctors.
Second, in September 2020, the FDA approved the supplemental new drug application for LINZESS, resulting in an updated label that now includes data demonstrating that linaclotide improve the overall abdominal symptoms of bloating, discomfort and pain in the adult population with IBS-C.
The team has already integrated some of the refreshed language on the LINZESS website and in certain promotional materials. A full refresh of the consumer campaign is expected in the spring of 2021.
Third, we have been leveraging innovative new channels like telehealth to amplify LINZESS consumer promotion in an effort to bring awareness and support to patients. Telehealth has been a significant driver of prescriptions written by gastroenterologists during the pandemic.
At the peak of the pandemic in April, a significant portion of LINZESS new patient starts came through telehealth. While the share of telehealth interactions has declined from the April peak as offices have opened up, we believe that telehealth, as a channel, has the potential to continue to play an important role in driving future growth of LINZESS.
The IBS-C category overall continues to experience remarkably stable growth, in line with what we have seen in recent years. With approximately 40% market share in the U.S. as of the end of September, LINZESS remains the prescription market leader in the category. This strong position, combined with what we believe are multiple remaining growth drivers, reinforces our confidence in our ability to continue to drive LINZESS growth now and into the future.
With that, I'll turn it over to Gina to discuss the financial results of the quarter.