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Operator
Greetings, and welcome to the scPharmaceuticals second-quarter 2024 earnings conference call. (Operator Instructions) As a reminder, this conference is being recorded.
It is now my pleasure to introduce your host, PJ Kelleher, Investor Relations. Thank you. You may begin.
PJ Kelleher - Investor Relations
Thank you, operator. Before turning the call over to management, I would like to make the following remarks concerning forward-looking statements. All statements on this conference call other than historical facts are forward-looking statements within the meaning of the federal securities laws, including but not limited to, statements regarding scPharmaceuticals' expected future financial results, management's expectations and plans for the business, the ongoing commercialization and marketing of FUROSCIX, and the potential label expansion and other regulatory approvals of FUROSCIX.
The words anticipate, believe, estimate, expect, intend, guidance, confidence, target, project, and other similar expressions are used typically to identify such forward-looking statements. These forward-looking statements are not guarantees of future performance and may involve and are subject to certain risks and uncertainties and other important factors that may affect scPharmaceuticals' business, financial condition, and other operating results. These include, but are not limited to, the risk factors and other qualifications contained in scPharmaceuticals' annual report on Form 10-K, quarterly reports on Form 10-Q, and other reports filed by the company with the SEC to which your attention is directed.
Actual outcomes and results may differ materially from what is expressed or implied by these forward-looking statements. Any forward-looking statements made in this conference call, including responses to your questions, are based on current expectations as of today and scPharmaceuticals expressively disclaims any intent or obligation to update these forward-looking statements except as required by law.
It is now my pleasure to turn the call over to Mr. John Tucker, Chief Executive Officer of scPharmaceuticals. John?
John Tucker - President, Chief Executive Officer, Director
Thank you, PJ. Thank you to everyone listening to this afternoon's call and webcast to review our second-quarter 2024 results. As has been our practice, I will begin with an operational update before I turn the call over to Steve Parsons, our Senior Vice President, Commercial, for a more detailed commercial update on FUROSCIX; and then Rachael Nokes, our Chief Financial Officer, for a review of our financials. We will then open the call for your questions.
I would like to begin this afternoon with a recap of the financing up to $175 million that we announced earlier this week. Upon closing of these transactions, approximately $75 million was added to the company's balance sheet, which extends our cash runway through profitability. Through this financing, the company also has access to an additional $50 million through debt and/or royalty facilities.
The financing is comprised of three parts. First, $75 million of senior debt facility with Perceptive Advisors, of which $50 million was funded at closing to repay $50 million of existing debt with Oaktree. An additional $25 million will be available subject to the achievement of certain pre-specified commercial and regulatory milestones. The debt carries a five-year term of which the first four years are interest-only with a bullet repayment in year five. Facility lowers our interest rates and pushed out the amortization as compared to the retired Oaktree facility.
Second, a synthetic royalty agreement of up to $50 million also with Perceptive Advisors. $25 million of the royalty financing was funded at close and the additional $25 million were made available subject to the achievement of certain pre-specified commercial milestones.
And finally, a public offering of approximately $50 million of equity led by the leading life science investors. Together, we believe this financing extends our cash runway through profitability.
Turning now to our launch progress. During the second quarter, we generated sequential net revenue growth that we believe reflects increasing awareness and utilization of FUROSCIX by cardiologists and heart failure specialists. As Steve will detail shortly, our leading indicators suggest that providers are increasingly more comfortable prescribing for us. It's to their heart failure patients during critical intervention windows, which are pre-hospital admission or post-discharge.
We reported net revenue of $8.1 million, representing a sequential growth of 33% as compared to the first quarter of 2024. Our gross-to-net discount during the second quarter was approximately 8%, down from 19 in the first quarter. We expect the GTN discount to increase over time as contracting with payers evolves and IDN demand grows. Looking to the back half of the year, we currently anticipate our GTN to range from 10% to 15% for the next two quarters.
Over the longer term, we continue to believe that a GTN in the 30% to 35% range is appropriate, although there will be some variability from quarter to quarter as we continue to expand our roster of payers and IDNs. I would like to now provide an update on several long-term growth initiatives that we previewed last quarter that we view as critical to our long-term growth strategy.
We announced that the FDA has approved our supplemental new drug application seeking to expand the FUROSCIX label to include all heart failure patients, including the most symptomatic patients and those with the greatest limitation on physical activity, categorized as New York Heart Association Class IV. FUROSCIX was previously indicated a treatment of congestion due to fluid overload in adult patients with New York Heart Association Class II and Class III chronic heart failure. By expanding the label to include New York Heart Association Class IV, which accounts for approximately 10% of heart failure patients and 30% of heart failure hospitalizations, we estimate that as many as 40% of these patients may potentially benefit from FUROSCIX.
Given FUROSCIX's ability to improve signs and symptoms of congestion, which may lead to a reduction in unnecessary hospital admissions and readmissions, with the potential to improve patient quality of life while reducing overall and heart failure-related healthcare costs, we believe uptake among cardiologists and heart failure specialists who treat these very symptomatic patients could be meaningful.
Turning now to the low-volume autoinjector that is in development. We announced earlier this week positive top-line study results from a PK study, which demonstrated that FUROSCIX achieved primary pharmacopinetic and secondary pharmacodynamic endpoints. Some of the highlights from the study results include: SCP-111 demonstrated bioavailability of 107.3, achieving the 90% confidence interval limit of 80% to 125%. Participants that received SCP-111 had similar urine output, urinary sodium excretion, and urinary potassium excretion at 6, 8, and 12 hours compared to IV furosemide.
Participants reported a median pain score of zero across all time points assessed. The most common adverse events with SCP-111 were localized at the injection site and systemic adverse events were consistent with those reported in the prescribing information for intravenous and oral furosemide. With these results, we continue to work towards our target submission of an sNDA to the FDA by the end of the year.
As we stated previously, we believe an autoinjector, if approved, will reduce our manufacturing costs compared to the current on-body infusor and confer certain environmental advantages, and give treating providers and their patients treatment flexibility.
Finally, we announced that FDA has accepted our filing of a supplemental new drug application seeking to expand the FUROSCIX label to treatment of edema due to fluid overload in patients with chronic kidney disease, or CKD. The FDA has previously indicated that no additional clinical studies were required to expand the FUROSCIX indications to include CKD if we can demonstrate an adequate PK and pharmacodynamic bridge to the listed drug, which is the furosemide injection.
CKD is a progressive disease characterized by worsening renal function over time, resulting in frequent episodes of fluid overload that are treated with loop diuretics. It is estimated that there are 6.6 million Americans with CKD that are treated with loop diuretics and estimated 50% of patients with CKD do not have a diagnosis of heart failure. This results in a potential incremental increase of $3.1 billion to the already existing $9.4 billion addressable market opportunity in heart failure.
With fluid overload being one of the most common complications in CKD, which worsens with disease progression, we believe FUROSCIX is beneficial to patients in CKD who have worsening symptoms due to fluid overload and are not responding to oral loop diuretics.
The FDA has signed a PDUFA date of March 6, 2025. If approved, we would make investments in our sales and commercial infrastructures to expand our reach to nephrologists.
At this point, I will turn the call over to our Senior Vice President of Commercials, Steve Parsons, for a deeper dive into our launch metrics. Steve?
Steve Parsons - Vice President, Head of Commercial
Thank you, John. As John indicated, we continue to be pleased with our progress since launch. From launch in February 2023 through June 30, 2024, we've had 2,713 unique prescribers. That's up 24% from the 2,183 prescribers we had from launch through March 31. We are encouraged by the prescriber growth in this quarter, and we believe this reflects our strategy of establishing a broad prescriber base. Importantly, more than half of these prescribers have written multiple prescriptions.
During the second quarter, approximately 9,300 doses were filled. That's up 15% sequentially from approximately 8,100 doses in the first quarter of 2024. During the second quarter, the average number of doses per prescription filled was 6.3 doses, which remains higher than our long-term expectations and up slightly from the 6.1 doses per prescription in the first quarter of 2024.
With the label expansion to now include Class IV heart failure patients, we anticipate that the average number of doses may rise further as those patients may need additional doses to treat more severe symptoms.
Our sales force has conducted 3,324 in-services from launch through June 30. That's up from 2,938 in-services from launch through March 31. In-services provide important training to offices on the prescribing process of FUROSCIX, and this ensures office readiness. As we open more new accounts, the execution of in-services remains fundamental to FUROSCIX's success. And we regard the number of in-services conducted each quarter as an important leading indicator.
Regarding our field sales force, we have said previously that we stand ready to add additional territories as demand warrants. As demand continues to grow, we plan to add 22 territories, for a total of 90 territories by the end of the third quarter. This will support the expanded label and increase our reach and frequency with more targeted cardiology and some nephrology specialists that treat chronic kidney disease patients who also have comorbid heart failure.
At the beginning of the second quarter, we made the decision to change our patient services hub. This transition took several weeks to get up and running effectively. But by the end of the quarter, the hub was operating very well and has been an asset in increasing the number of fill doses for Q3 and into the future.
From a marketing perspective, we continue to execute a broad, multi-channel marketing campaign to drive brand awareness, adoption, and commitment. Our marketing encompasses many different activities, including a significant patient awareness component. Other ongoing activities include engagement and development of key opinion leaders, conference presence, message evolution, and medical education programs, among other critical tasks. We plan to have a very large presence at the Heart Failure Society of America Conference coming this September in Atlanta.
Overall, we are pleased with our continued progress, and we are excited about the opportunity and the path ahead. This concludes my update. I'd now like to turn the call over to our Chief Financial Officer, Rachael Nokes, for a review of our financials. Rachael?
Rachael Nokes - Chief Financial Officer
Thank you, Steve. As of June 30, 2024, we held $38.5 million in cash and cash investments, compared to $76 million in cash, cash equivalent, and investments as of December 31, 2023. This excludes the funds we raised through the financing that John discussed earlier.
Now, I will cover a few income statement items. We reported a net loss of $17.1 million for the second quarter of 2024 compared to a net loss of $14.2 million for the second quarter of 2023.
Product revenues were $8.1 million for the second quarter of 2024, compared to $1.6 million for the second quarter of 2023. Costs of product revenues were $2.3 million for the second quarter of 2024, compared to $0.4 million for the second quarter of 2023. The increase in both product revenues and cost of product revenues for the quarter ended June 30, 2024 was due to increased demand for FUROSCIX further into the commercial launch and related manufacturing costs.
Research and development expenses were $2.7 million for the second quarter of 2024, compared to $2.9 million for the comparable period in 2023. The decrease in research and development expenses for the quarter ended June 30, 2024 was primarily due to a decrease in pharmaceutical development costs, offset by clinical study costs and employee-related costs.
Selling, general, and administrative expenses were $17.5 million the second quarter of 2024, compared to $12.1 million for the comparable period in 2023. The increase in selling, general, and administrative expenses for the quarter ended June 30, 2024 was primarily due to an increase in employee-related costs, commercial costs, product samples, and patient support.
As of June 30, 2024, we had 36,139,802 total shares outstanding.
That concludes the financial update. John?
John Tucker - President, Chief Executive Officer, Director
Thanks, Rachael. This concludes our prepared remarks. At this point, we will open the call for question.
Operator
(Operator Instructions) Roanna Ruiz, Leerink Partners.
Roanna Ruiz - Analyst
Great. Afternoon, everyone. Quick couple ones from me. First, how much could the average number of doses per prescription for FUROSCIX actually increase with the new label for Class IV? And just to that, how are you thinking about clinicians? How fast they can prescribe FUROSCIX for Class IV patients? Are there any hurdles or logistics that they might need to get through before they can really get off to the races and prescribe?
John Tucker - President, Chief Executive Officer, Director
Yeah. Hi, Roanna. This is John. I'm going to have Steve answer those two questions, okay?
Steve Parsons - Vice President, Head of Commercial
Yeah. So it'll be hard to predict what the impact on the average number of doses is across the whole population, but we do think the Class IV patients will need 9 doses or even up to 12 doses based on the severity of their symptoms. And we do think they'll get prescriptions more often than the average heart failure patient, as often as every month or every other month. So that could impact the average doses per prescription over a quarter.
And then back --
John Tucker - President, Chief Executive Officer, Director
How fast will we --?
Steve Parsons - Vice President, Head of Commercial
Yeah, we should start to see prescriptions for heart failure for Class IV starting next week. Our sales force will be trained. They'll be in the field. We've been in contact with the payers to make sure they update their systems to reflect PA to label, and the label now will not limit the use of Class IV patients. So we're expecting to see it immediately as we get around to those doctors who have a concentrated population of Class IV patients -- heart failure specialist and the advanced heart failure clinics.
Roanna Ruiz - Analyst
Got it. Makes sense. And thinking ahead to potential approval for CKD patients with edema, how are you thinking about possibly stepping up the field force size? You kind of alluded to you consider growth there. What sort of metrics are you looking for to give you a signal that you should meaningfully expand the field force at that time?
John Tucker - President, Chief Executive Officer, Director
Yeah, so we're going to move to 90 reps. We're in the process of it right now, based on the increasing demand we've seen, especially into this quarter, and with the label expansion into Class IV. So that'll have us at 90 reps.
With kidney, Roanna, we're going to go to probably 130 reps, and that will be based on how many nephrologists we want to cover and the cardiologists. So our thinking now is this will be one sales force, 130 reps, calling on cardiologists, heart failure specialists, and nephrologists.
Roanna Ruiz - Analyst
Got it. Super helpful. Thanks.
John Tucker - President, Chief Executive Officer, Director
Great. Thank you.
Operator
Stacy Ku, TD Cowen.
Unidentified Participant
Hi, this is [Vish] on for Stacy. Congratulations on a stellar quarter and thanks for taking our questions. We have a couple.
So first, I guess following up on the previous question, some of your remarks. Can you talk about some of your ongoing preparations for the expansion this month? What sort of level of enthusiasm are you hearing from KOLs? Do you expect some of the early adopters have already identified? Some key recurring Class IV patients to start prescribing? So that's the first question.
And then the second, so you've made some great progress in establishing your launch infrastructure. So could you talk a bit about that fill rate, how it's been performing for Q2, and then how do you expect it's going to improve with some of the improvements that you've made, and what your expectations there are? Thank you.
John Tucker - President, Chief Executive Officer, Director
Okay. Thank you, Vish. I'll answer the second question first and then turn it over to Steve for your question about the Class IV preparation. So I think Steve mentioned in his prepared remarks that we did a change in our hub. Some of those who do the change healthcare, but we did move our hub to a hub that now has change healthcare and relay. So if anything ever cyber attack one, we built through the other one.
But [pump transducer], they get hurt us in April with our fill rate and that hurt us for the quarter. It hurt our net sales. It probably cost us 5%-ish on net sales units shipped to patients because, again, once we lose that script, we lose that patient because of the acute event nature of the product. So we saw a fill rate in the 40 -- in the mid- to high-40s for the quarter, which really bad in April. When we made that hub move, it was tough.
But with the hub change, what we've seen in Q3, and again, it's only five or six weeks here, but our fill rate has moved up dramatically. And that was the whole idea of making the change to the hub. So a little short-term pain. That was pretty painful, but we'd be able now to have a hub in place that is really seeing a dramatic increase in our fill rate.
So again, in the mid- to high-40s for Q2, started out really low. And then for this quarter, right now, we're closer to 60% and even a little over for this month, 60% fill rate. So we think that will have a meaningful impact on our net sales this quarter. Steve, do you want to answer the first question?
Steve Parsons - Vice President, Head of Commercial
I think the first question around our preparation to take advantage of this indication expansion with heart failure specialists. They're a subset of the general cardiology practice. We know them well. We know where the advanced heart failure clinics and office locations are. We know who tried to use FUROSCIX in Class IV early on and was frustrated by the PA, the prior off the label that didn't allow that.
So I'm sure the reps have been anxious to go in there and give the good news. They'll be able to do that starting next week. We have to do a little training. We have to update some of our promotional materials and submit those. But everyone has a hit list of folks that they're going to go to first. And often, and then will do some email blasts and stuff to reach people in a mass way.
So we'll prepare to do this. It's a good opportunity. It's an unmet need. And we're going to fill it.
Unidentified Participant
Perfect. Thank you very much.
Operator
Chase Knickerbocker, Craig Hallum Capital.
Chase Knickerbocker - Analyst
Good afternoon, guys. Thanks for taking the questions and congrats on a lot of recent progress here. Maybe just first to start, kind of parlaying out the hub change. Can you just speak to what the hub is doing differently -- your new hub is doing differently to drive that dramatic of improvement?
Obviously, some of it was just maybe some of that change hangover. But 60%-plus is well above what we've seen at any point historically. So what are they doing differently that's really driving that improvement?
John Tucker - President, Chief Executive Officer, Director
Yes. Hey, Chase, it's John. Thank you for the question. I want Steve to answer how the hub is different than the old hub.
Steve Parsons - Vice President, Head of Commercial
Yeah. So our launch hub was all manual. Everything was fax in paper order. And that reached a critical limit to us. We didn't think they could grow with us. And then we had the problems with that. Everything's going through change. They had one processor and we needed two.
The new hub is all online. It can be all online. The docs can submit their orders. They immediately see that it's been received. They immediately see that the prior off has been submitted, that it's been approved, what the copay is, that it's been shipped to the patient, and they love all of that.
And it encourages them to prescribe more, but also, things are getting filled well and faster. If something was missing that the doctor needed to provide for the prior off to go through, clinical notice sometimes, they can see that. There's a chat function where our case managers at the hub are speaking to the office, medical assistants, and RNs. And so everything's just more modern, more optimal, and it's been effective. So we're very happy, we're very encouraged by that.
Chase Knickerbocker - Analyst
It seems like it's still early days. I mean, just maybe speak to your optimism that that continues to get better as physicians get more and more confident with the new hub. And then just second, John or Steve, what should we think about for the cadence of growth to net changes? You said we still expect 30% to 35% longer term. I mean, if we look at that next year, do we get there just on some of the Medicare changes that are upcoming or does that assume that we contract with some of these larger PDP, Medicare Advantage plans? Thanks.
John Tucker - President, Chief Executive Officer, Director
So on the second question, on the GTN, so we do expect it to go up in the second half of this year, driven a lot by the IDNs. So we're seeing more IDN business. And it's discount versus WACC, so that will have an impact on our GTN for the balance of this year.
I think -- we think it's going to be â [will stop orders], Q3, 10% to 15%, Q4 in the same range. So I think we can model it that way. Then I think next year, things change. You have mandatory rebates with Medicare in the early stage and then in the catastrophic stage. And we'll be doing supplemental rebates with the Medicare payers as well.
So we still think that long term, and I mean long term being next year, you could be in a 30% to 35% GTN. Now we think next year sets up well, like spectacular for us because with the redesign, patient co-pays are capped, they're going to smooth it, so they've got $166.
So where we lost scripts is when a patient has a high co-pay. So we really think next year with the capping at $166, that our fill rate continues to go up. Now, we mentioned it was in the -- for August anyways, it's in the 60s, low-60s.
No brand's going to get above 80%, 85%. We always will have a little gap because we have those scripts that are written and the doctorsâ kind of put them on layaway. But we think once those get filled and they do get filled, we fill them all the time, that we can get to 80%. Part of that is the co-pay when that resets next year and some of the progress we're making with the plan. Some of it is continued improvement in the hub.
Again, it hurt us in April, but it's helping us now. So it was the right move. But there's still things you learn. There's things the reps can do better in the field with the doctors. There's things the doctors can do better. But we think that's going to continue to move up, Chase.
Chase Knickerbocker - Analyst
Got it. Yeah. And then John, maybe just last one and I'll hop back in the queue. But do you think that it's going to take some time for Medicare beneficiaries to fully understand the changes that happen next year? Will they quickly grasp that their co-pays are essentially now capped monthly and the incentives are kind of different. Is another way do you think it can get to that 80% to 85% range fairly quickly once that change happens? Or how do you think about that?
John Tucker - President, Chief Executive Officer, Director
Yeah, I don't think it happens overnight with patients and physicians. So we have education, we're going to be doing to patients -- I mean, consulting physicians about co-pays and how they've changed. But it's not going to change overnight. But we do think through the year, it's going to get better as it rolls out and more patients understand how it works and physicians understand how it works.
But we'll be educating --
Steve Parsons - Vice President, Head of Commercial
I think it'll go up pretty significantly once everyone gets in catastrophic after 2,000. There won't be any co-pay drag friction.
Chase Knickerbocker - Analyst
Great. Thanks, guys.
John Tucker - President, Chief Executive Officer, Director
Thanks, Chase.
Operator
At this time, there are no further questions. And I would like to turn the floor back over to John Tucker for any closing comments.
John Tucker - President, Chief Executive Officer, Director
Thank you. Okay, that concludes our call this afternoon. We are very pleased with our second-quarter results and our leading indicators remain strong. Additionally, the financing that we announced is truly transformational for our company and provides the capital necessary to execute our FUROSCIX commercial plan while also pursuing long-term growth initiatives. I look forward to the successful year and providing our next quarterly update in November. Thank you again and have a good evening
Operator
Ladies and gentlemen, that concludes today's conference. Thank you for joining us. You may now disconnect your lines.