Resources for Prescribing WELIREG™ (belzutifan)
Dispensing WELIREG
WELIREG prescriptions can be filled through EITHER the specialty pharmacy network OR certain physician practices with dispensing capabilities and certain hospital pharmacies.
Send the WELIREG prescription to one of the specialty pharmacies in the network
- Phone: 800-850-4306
- Fax: 800-823-4506
- biologics.mckesson.com
- Phone: 877-662-6633
- Fax: 877-662-6355
- onco360.com
Merck is not affiliated with and does not endorse one specialty pharmacy over another.
Fill the prescription via your in-office dispensing practice or hospital pharmacy
Merck is not affiliated with and does not endorse one specialty pharmacy over another.
Ordering WELIREG
NDC = National Drug Code.
If your facility has been authorized by Merck to dispense WELIREG, The Merck Access Program can help answer questions about access and support for patients prescribed WELIREG.
Video Resources
Mechanism of Action
The approval of WELIREG marks the first treatment option in a novel therapeutic class available for your appropriate patients with advanced RCC since 2015.1
Efficacy
See primary analysis data from LITESPARK-005 and the study design that included only patients who received prior treatment with both anti–PD-1/L1 and VEGF-TKI therapies, in sequence or in combination.
2L+ Treatment Sequencing
WELIREG may be considered as early as the second line for your appropriate patients with advanced RCC following treatment with both anti–PD-1/L1 and VEGF-TKI therapies.
Reference: 1. Yap NY, Khoo WT, Perumal K, et al. Practical updates in medical therapy for advanced and metastatic renal cell carcinoma. Urol Sci. 2018;29(3):120–128.
Additional Materials

Download this flashcard for an overview of the NCCN Guidelines for belzutifan (WELIREG) in adult patients with previously treated 2L+ advanced RCC.

Download this guide to learn about the adverse reaction profile of WELIREG and how to manage adverse reactions with dose modifications.
NCCN = National Comprehensive Cancer Network® (NCCN®).
Connect with Merck
The Merck Access Program
Visit The Merck Access Program for information on access, coverage, and dispensing WELIREG.
Connect With a Merck Associate
Merck is committed to helping you get answers to your questions. Connect with a Merck Associate now. This service is for US health care professionals.
Patient Website for WELIREG
This website provides information and resources for patients who have been prescribed WELIREG.
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