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  •  REZZAYO® (rezafungin) is indicated for the treatment of invasive candidiasis in adults. Consideration should be given to official guidance on the appropriate use of antifungal agents.2
  • The marketing authorisation was based on positive results from the pivotal ReSTORE Phase III clinical trial and supported by the STRIVE Phase II clinical trial and extensive nonclinical development program.3,4
  • This represents the first new treatment option in over 15 years for eligible adult patients with invasive candidiasis and will be supplied by Napp Pharmaceuticals Limited (Napp) in GB.5-9

CAMBRIDGE, England, 2nd February 2024: Napp Pharmaceuticals Limited, a member of the international network of Mundipharma independent associated companies, today announced that the Medicines and Healthcare Products Regulatory Agency (MHRA) has authorised rezafungin for the treatment of invasive candidiasis in adults in Great Britain (GB).1,2

The authorisation was based on positive results from the pivotal ReSTORE Phase III clinical trial which demonstrated statistical non-inferiority for rezafungin, dosed once weekly, when compared to the current standard of care, caspofungin, dosed once daily.2,3,4 These findings are supported by the STRIVE Phase II clinical trial and an extensive nonclinical development program.3,4

ReSTORE, a multicentre, prospective, randomised and double-blind Phase III trial compared the efficacy and safety of intravenous rezafungin with intravenous caspofungin in eligible patients with invasive candidiasis.2,3 The primary efficacy outcome was global response (confirmed by the Data Review Committee [DRC]) at day 14.3 Global response was  determined from clinical response, mycological response, and radiologic response (for qualifying subjects with invasive candidiasis).2,3 Of the 187 patients in the modified intention-to-treat (mITT) population, 59.1% of patients in the rezafungin group (55/93) and 60.6% of patients in the caspofungin group (57/94) had a global response of cure at day 14 (weighted treatment difference −1.1% [95% CI −14.9, 12.7].2,3 Non-inferiority was to be concluded if the lower bound of the 95% confidence internal (CI) for the difference in Day 14 cure rates (rezafungin – caspofungin) was >-20%.2 

Rezafungin was generally well tolerated in clinical trials, to date very common adverse reactions include hypokalaemia, pyrexia, and diarrhoea. Common adverse reactions include anaemia, hypomagnesaemia, hypophosphataemia, hypotension, wheezing, vomiting, nausea, abdominal pain, constipation, erythema, and rash. Increased blood alkaline phosphatase, hepatic enzymes, alanine aminotransferase, aspartate aminotransferase and blood bilirubin were also common. Uncommon adverse events were hyperphosphataemia, hyponatraemia, phototoxicity, tremor and increased eosinophil count. There were spontaneous reports of urticaria (frequency not known). Transient infusion-related reactions have occurred with rezafungin, characterised by flushing, sensation of warmth, nausea, and chest tightness.

Rezafungin may cause increased risk of phototoxicity. Eligible patients should be advised to avoid sun exposure and other sources of UV radiation without adequate protection during treatment and for 7 days after the last administration of rezafungin.2

Invasive candidiasis, is a severe, life-threatening infection of the bloodstream and/or deep/visceral tissues.10,11 It affects seriously ill people, especially those with a weakened immune system and the mortality rate can be 40% or more.12,13 It can place a large burden on the healthcare system, with the potential for extended treatment regimens and long hospital stays.14 In the last 15 years there have been no new treatments and morbidity and mortality rates remain largely the same, indicating the need for alternative treatment options.5-9,15

Professor P. Lewis White PhD, FECMM, FRCPath, Consultant Clinical Scientist and Head of the PHW Mycology Reference Laboratory, Honorary Professor, Cardiff University Centre for Trials Research said “Invasive candidiasis remains a difficult-to-treat disease which has a significant impact on critically ill and immunocompromised patients. With limited advances in treating this condition over the past 15 years, today’s announcement is a positive step towards supporting eligible patients and could enable the healthcare professional community an alternative way to manage these patients with invasive candidiasis using a new, once-weekly intravenous treatment option.”

“This authorisation is a culmination of years of developing an additional treatment option for eligible adult patients suffering from invasive candidiasis and underscores our commitment to supporting management of infectious diseases.” said Dr Ben David, Medical Director for  Northern Europe at Mundipharma.

Rezafungin has been granted Orphan Drug Designation (ODD) in GB for the treatment of invasive candidiasis in adults.1 The MHRA grants ODD to medicines intended for the treatment, diagnosis or prevention of rare diseases or disorders that affect fewer than 5 in 10,000 people in GB where no satisfactory method of diagnosis, prevention or treatment of the condition concerned exists, or, if such a method exists, the medicine must be of significant benefit to those affected by the condition.16

About invasive candidiasis
Invasive candidiasis (IC) continues to be an area of significant unmet need, especially for critically ill patients in hospitals and patients with compromised immune systems.14 Despite a number of available treatments, the mortality rate for patients with invasive candidiasis can be 40% or more.13,14 IC is characterised as a severe, life-threatening systemic Candida infection of the bloodstream and/or deep/visceral tissues.17

About Rezafungin
Rezafungin is a novel once-weekly echinocandin that has been developed for the treatment of invasive candidiasis in adults.18

About Napp
Napp Pharmaceuticals Limited is part of Mundipharma, a global healthcare company with a presence across Africa, Asia Pacific, Canada, Europe, Latin America, and the Middle East. Mundipharma is dedicated to bringing innovative treatments to patients in the areas of pain management, infectious disease and consumer healthcare as well as other severe and debilitating disease areas. Our guiding principles, centered around Integrity and Patient-Centricity, are at the heart of everything we do. For more information visit

Future clinical trial data
A second Phase III clinical trial of rezafungin for the prevention of invasive fungal disease in patients undergoing allogeneic blood and marrow transplantation (ReSPECT trial) is currently being conducted.18

Media contact
Liana Del Medico

Registered office addresses
NAPP PHARMACEUTICALS LIMITED a company having its registered office at Cambridge Science Park, Milton Road, Cambridge CB4 0AB, England.
MUNDIPHARMA RESEARCH LIMITED, a company having its registered office at Cambridge Science Park, Milton Road, Cambridge, CB4 0AB, England.

1. UK Medicines and Healthcare Products Regulatory Agency authorisation. Available at: (last accessed February 2024)
2. REZZAYO® Summary of Product Characteristics.
3. Thompson GR, et al. Lancet 2023;401(10370):49–59.
4. Thompson GR, et al. Lancet Infect Dis 2023;
5. Ham YY, et al. Future Microbiology 2021;16(1):27–36.
6. CANCIDAS (formerly Caspofungin MSD) EPAR. Available at: (last accessed February 2024).
7. Vfend (voriconazole) EPAR. Available at: (last accessed February 2024).
8. Ecalta (anidulafungin) EPAR. Available at: (last accessed February 2024).
9. Mycamine (micafungin) EPAR. Available at: (last accessed February 2024).
10. Pappas PG, et al. Nat Rev Dis Primers 2018;4:18026. 
11. CDC. Invasive candidiasis. Available at: (last accessed February 2024).
12. Kullberg BJ, Arendrup MC. N Engl J Med 2015;373:1445–56.
13. Bassetti M, et al. Crit Care 2019;23(1):219.
14. Cortegiani A, et al. Cochrane Database Syst Rev 2016;2016:Cd004920.
15. Bassetti M, et al. J Antimicrob Chemother 2018; 73 Suppl 1: i14–i25 doi:10.1093/jac/dkx445.
16. UK Medicines and Healthcare Products Regulatory Agency, Guidance – Orphan
medicinal products. Available at: (last accessed February 2024).
17. Cortes JA, Corrales IF. Invasive candidiasis: Epidemiology and Risk Factors. November 2018. Available at (last accessed February 2024).
18. Cidara Therapeutics and Mundipharma Announce Positive Topline Results from the Global Phase 3 Pivotal ReSTORE Trial of Rezafungin for the Treatment of invasive candidiasis. Available at (last accessed February 2024).

Opioid Charter

For Mundipharma’s Charter on the responsible medical use of opioid analgesics in pain management click here.

Opioid Safety Statement

“Attention should be given as the use of opioids has a risk of addiction, misuse and abuse. Therefore, appropriate assessment and monitoring is a requirement at initiation, maintenance and tapering down of opioid therapy.”