A single-use pen option for PV is now available

BESREMi Pen is now available. Prep. Click. Push.

Ropeginterferon alfa-2b-njft (BESREMi) is recommended by the National Comprehensive Cancer Network^® (NCCN^®) as a preferred first-line cytoreductive therapy option for both low-risk (symptomatic) and high-risk patients with polycythemia vera (PV).¹

A simplified self-administration option with the new BESREMi Pen. Now available: BESREMi Pen.

Photographic, 3D image of BESREMi Pen, horizontal view.

PharmaEssentia™ is committed to supporting patients and care teams throughout treatment. The new BESREMi Pen offers a single-use prefilled option for patients prescribed BESREMi, delivering an established therapy in a trusted, patient-friendly device.

The BESREMi Pen is designed to support confident, consistent self-administration for patients with PV by offering:

A patient-friendly design that simplifies administration
Consistent delivery and accurate dosing in a trusted, patient-friendly device
Ease of use so patients are empowered to confidently maintain their dosing regimen
A treatment option that makes it easy to train patients on how to self-administer

See Product Details for the BESREMi Pen

BESREMi Is Covered Under the Pharmacy Benefit

BESREMi is self-administered and is not a buy-and-bill product
There is no J-code for BESREMi

BESREMi Pen Is Available Through an Established Network

BESREMi is available through:

Medically Integrated Pharmacies (MIPs), which include Authorized Health Systems and Eligible GPO members
Limited Specialty Pharmacy (SP) Network

Explore BESREMi Pen ordering information

INDICATION

BESREMi is indicated for the treatment of adults with polycythemia vera.

IMPORTANT SAFETY INFORMATION

WARNING: RISK OF SERIOUS DISORDERS

Interferon alfa products may cause or aggravate fatal or life-threatening neuropsychiatric, autoimmune, ischemic, and infectious disorders. Patients should be monitored closely with periodic clinical and laboratory evaluations. Therapy should be withdrawn in patients with persistently severe or worsening signs or symptoms of these conditions. In many, but not all cases, these disorders resolve after stopping therapy.

CONTRAINDICATIONS

Existence of or history of severe depression, suicidal ideation, or suicide attempt
Hypersensitivity to interferons or any inactive ingredients
Moderate or severe hepatic impairment
History or presence of active serious or untreated autoimmune disease
History of transplantation and receiving immunosuppressant agents

WARNINGS AND PRECAUTIONS

Depression and Suicide: Closely monitor patients for any symptoms of psychiatric disorders and, if needed, consider psychiatric consultation and treatment or dosage modifications as listed in the full prescribing information.
Endocrine Toxicity: Do not use BESREMi in patients with active serious or untreated endocrine disorders associated with autoimmune disease. Evaluate thyroid function in patients who develop symptoms suggestive of thyroid disease during BESREMi therapy. Discontinue BESREMi in patients who develop endocrine disorders that cannot be adequately managed during treatment with BESREMi.
Cardiovascular Toxicity: Patients with a history of cardiovascular disorders should be closely monitored for cardiovascular toxicity during BESREMi therapy. Avoid use of BESREMi in patients with severe or unstable cardiovascular disease or recent stroke or myocardial infarction.
Decreased Peripheral Blood Counts: Monitor complete blood counts at baseline, during titration, and every 3-6 months during the maintenance phase.
Pancreatitis/Colitis/Pulmonary Toxicity: Interrupt BESREMi treatment in patients with possible pancreatitis, colitis, or pulmonary toxicity and evaluate promptly. Consider discontinuation of BESREMi in patients with confirmed pancreatitis or who show signs or symptoms of serious ulcerative or hemorrhagic colitis, or who develop pulmonary infiltrates or pulmonary function impairment.
Ophthalmologic Toxicity: Advise patients to have eye examinations before and during treatment. Discontinue BESREMi in patients who develop new or worsening eye disorders.
Hyperlipidemia/Hepatotoxicity/Renal Toxicity: Monitor serum triglycerides, liver enzymes, hepatic function, and serum creatinine at baseline and during therapy. Avoid use of BESREMi in patients with eGFR <30 mL/min. Discontinue BESREMi in patients with persistently marked elevated triglycerides, evidence of hepatic decompensation, or if renal impairment develops during treatment.
Dental and Periodontal Toxicity: Patients should have good oral hygiene and regular dental examinations.
Dermatologic Toxicity: Consider discontinuation of BESREMi if clinically significant dermatologic toxicity occurs.
Driving and Operating Machinery: BESREMi may impact the ability to drive and use machinery. Patients should not drive or use heavy machinery until they know how BESREMi affects their abilities. Patients who experience dizziness, somnolence, or hallucination during BESREMi therapy should avoid driving or using machinery.
Embryo-Fetal Toxicity: Based on the mechanism of action, BESREMi can cause fetal harm when administered to a pregnant woman. Obtain a pregnancy test in females of reproductive potential prior to initiating treatment with BESREMi. Advise females of reproductive potential to use an effective method of contraception during treatment with BESREMi and for at least 8 weeks after the final dose. Advise women not to breastfeed during treatment and for 8 weeks after the final dose.

ADVERSE REACTIONS

The most common adverse reactions reported in >40% of patients were influenza-like illness, arthralgia, fatigue, pruritus, nasopharyngitis, and musculoskeletal pain.

DRUG INTERACTIONS

Patients on BESREMi who are receiving concomitant drugs which are CYP450 substrates with a narrow therapeutic index should be monitored to inform the need for dosage modification. Avoid use with myelosuppressive agents, narcotics, hypnotics, or sedatives, and monitor patients receiving the combination for effects of excessive CNS toxicity.

To report SUSPECTED ADVERSE REACTIONS, contact PharmaEssentia at 1-800-999-2449 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Please see full Prescribing Information, including Boxed Warning.

Reference: 1. Referenced with permission from the NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines^®) for Myeloproliferative Neoplasms V.1.2026. © National Comprehensive Cancer Network, Inc. 2026. All rights reserved. Accessed January 22, 2026. To view the most recent and complete version of the guideline, go online to NCCN.org. NCCN makes no warranties of any kind whatsoever regarding their content, use or application and disclaims any responsibility for their application or use in any way.

© 2026 PharmaEssentia Corporation. All rights reserved.
BESREMi, the BESREMi logo, and PharmaEssentia are registered trademarks of PharmaEssentia Corporation, and BESREMi Pen, the BESREMi Pen logo, and the PharmaEssentia logo are trademarks of PharmaEssentia Corporation.
US-BSRM-2600010 (v1.0) 07/2026

This content is sponsored by PharmaEssentia, and ION Oncology Practice Network has not independently reviewed or verified the information provided by PharmaEssentia.

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