On January 13, 2026 ESTEVE and TerSera Therapeutics LLC reported that they have entered into an agreement in which ESTEVE will acquire TerSera’s Infusion Specialty Therapies Business Unit (IST). This strategic acquisition enables ESTEVE to expand its U.S. presence, with two highly specialized on-market assets and a dedicated team of sales, marketing and medical professionals.
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TerSera’s IST business unit includes two specialty medications, Prialt (ziconotide intrathecal infusion) and Quzyttir (cetirizine hydrochloride injection). Prialt is the only FDA-approved, non-opioid agent indicated for the management of severe chronic pain in adult patients for whom intrathecal therapy is warranted, and who are intolerant of or refractory to other treatment, such as systemic analgesics, adjunctive therapies, or intrathecal morphine.1 Prialt is currently marketed in Europe by ESTEVE.2 Quzyttir is the first and only injectable second-generation H1 antihistamine approved by the FDA for the treatment of acute urticaria in adults and children six months of age and older.3
With this transaction, ESTEVE will obtain worldwide rights for Quzyttir in all territories (except for China) and consolidates its rights for Prialt worldwide.
Staffan Schüberg, ESTEVE’s Chief Executive Officer stated: "We are excited to welcome the Infusion Specialty Therapies Business Unit and look forward to welcoming TerSera’s talented team to ESTEVE. This acquisition perfectly aligns with our strategic vision of providing highly specialized solutions where there is a significant unmet medical need. By adding Quzyttir to our portfolio and expanding to the US market with Prialt, we not only strengthen our expertise in highly specialized therapies but also accelerate our expansion in the United States—the world’s largest pharmaceutical market."
"ESTEVE has been our long-term partner for Prialt in Europe. Their expertise and core areas of focus make them the ideal future owner for IST," said Edward Donovan, Chief Executive Officer of TerSera. "We believe this transaction provides an excellent home for Prialt and Quzyttir to continue the strong momentum we have established with these medicines, while we sharpen our focus on our core therapeutic areas of oncology and rare disease."
This deal reinforces ESTEVE’s growth in the United States, a growth that began with the acquisition in 2024 of a business specialized in rare and ultra-rare diseases in the areas of endocrinology and onco-endocrinology. ESTEVE’s highly specialized portfolio has been further strengthened by the subsequent expansion in 2025: licensing-in for Ex US a biologic product used to treat children and adolescents from 2 to 18 years-old who suffer from severe primary insulin-like growth factor 1 deficiency4; an adjuvant treatment being investigated in the U.S. and considered standard of care outside of the U.S. where it is approved for high-grade resectable non-metastatic osteosarcoma in patients aged between 2 and 30 years5 ; and a medicine that is used in adults and children above 5 years of age to treat aggressive and symptomatic medullary thyroid cancer.6
The current transaction is expected to close in the first quarter of 2026, subject to regulatory clearances.
Perella Weinberg Partners are the financial advisor to ESTEVE on this transaction, and Arnold & Porter are serving as legal counsel. Leerink Partners acted as the lead financial advisor to TerSera, and Kirkland & Ellis LLP is serving as legal counsel.
About PRIALT (Ziconotide Intrathecal Infusion)
PRIALT is a non-opioid intrathecal analgesic indicated for the management of severe chronic pain in patients for whom intrathecal therapy is warranted and who are intolerant of or refractory to other treatments. Derived from a marine snail peptide, ziconotide acts as a selective N-type calcium channel blocker, interrupting pain signal transmission in the spinal cord. Ziconotide is administered via continuous intrathecal infusion and is not associated with the risk of addiction or respiratory depression commonly seen with opioid therapies.1
IMPORTANT SAFETY INFORMATION
WARNING: NEUROPSYCHIATRIC ADVERSE REACTIONS
PRIALT is contraindicated in patients with a preexisting history of psychosis. Severe psychiatric symptoms and neurological impairment may occur during treatment with PRIALT. Monitor all patients frequently for evidence of cognitive impairment, hallucinations, or changes in mood or consciousness. Discontinue PRIALT therapy in the event of serious neurological or psychiatric signs or symptoms.
Contraindications
PRIALT is contraindicated in patients with:
A known hypersensitivity to ziconotide or any of its formulation components.
Any other concomitant treatment or medical condition that would render intrathecal administration hazardous, such as the presence of infection at the microinfusion injection site, uncontrolled bleeding diathesis, and spinal canal obstruction that impairs circulation of cerebrospinal fluid (CSF).
A pre-existing history of psychosis.
Warnings and Precautions
Cognitive and Neuropsychiatric Adverse Reactions
Severe psychiatric symptoms and neurological impairment may occur during treatment. Monitor all patients frequently for cognitive impairment, hallucinations, or changes in mood or consciousness. PRIALT may cause or worsen depression, with the risk of suicide in susceptible patients.
In clinical trials, 12% of patients reported hallucinations; other acute psychiatric events included paranoid reactions (3%), hostility (2%), delirium (2%), psychosis (1%), and manic reactions (0.4%).
Patients with pretreatment psychiatric disorders may be at increased risk. Management of psychiatric complications may need to include discontinuation of PRIALT, treatment with psychotherapeutic agents and/or short-term hospitalization.
In clinical trials, cognitive adverse reactions included confusion (33%), memory impairment (22%), speech disorder (14%), aphasia (12%), thinking abnormal (8%), and amnesia (1%). Cognitive impairment may appear gradually after several weeks of treatment. Reduce the dose of PRIALT or discontinue the use of PRIALT if signs or symptoms of cognitive impairment develop, but other contributing causes must also be considered. The cognitive effects of PRIALT are generally reversible within 2 weeks after drug discontinuation. The elderly (≥65 years) are at higher risk for confusion. Concomitant use of central nervous system (CNS) depressants with PRIALT may have additive effects.
Meningitis and Other Infections
Meningitis can occur due to inadvertent contamination of the microinfusion device and other means. In clinical trials, the rate of meningitis was 3% (40 cases) in the PRIALT group using either internal or external microinfusion devices and 1% (1 case) with placebo. In patients with external microinfusion devices and catheters, meningitis occurred in 38 out of 41 patients (93%), 37 of whom received PRIALT and one who received placebo. Patients, caregivers, and healthcare providers must be particularly vigilant for the signs and symptoms of meningitis including, but not limited to, fever, headache, stiff neck, altered mental status (e.g., lethargy, confusion, disorientation), nausea or vomiting, and occasionally seizures.
Strict aseptic procedures must be used during the preparation of the PRIALT solution and refilling of the microinfusion device.
Reduced Level of Consciousness
In clinical trials, 2% of PRIALT-treated patients became unresponsive or stuporous. If reduced levels of consciousness occur, discontinue PRIALT until the event resolves, and other etiologies (e.g., meningitis) must be considered.
Elevation of Creatine Kinase
In clinical trials, serum creatine kinase (CK) levels above the upper limit of normal (ULN) were reported in 40% of patients, with 11% of patients having CK levels >3 times ULN. Incidences were higher during the first 2 months of treatment. Serum CK should be monitored periodically. In the setting of new neuromuscular symptoms, evaluate patients, obtain CK measurements, and if symptoms continue and CK levels remain elevated or continue to rise, reduce the dose or discontinue the use of PRIALT.
Withdrawal From Opiates
PRIALT is not an opiate and cannot prevent or relieve the symptoms associated with the withdrawal of opiates. To avoid withdrawal syndrome when opiate withdrawal is necessary, do not abruptly reduce or withdraw opioid medications.
Driving and Operating Machinery
Use of PRIALT has been associated with cognitive impairment and decreased alertness/unresponsiveness. Caution patients against engaging in hazardous activities that require complete mental alertness or motor coordination.
Most Common Adverse Reactions
The most frequently reported adverse reactions (≥25%) in clinical trials (n=1254 PRIALT-treated patients) were dizziness, nausea, confusional state, and nystagmus. Slower titration of PRIALT may result in fewer serious adverse reactions and discontinuations for adverse reactions.
Indication
PRIALT (ziconotide) solution, intrathecal infusion is indicated for the management of severe chronic pain in adult patients for whom intrathecal (IT) therapy is warranted, and who are intolerant of or refractory to other treatment, such as systemic analgesics, adjunctive therapies, or IT morphine.
To report suspected adverse reactions, contact the FDA at 1-800-FDA-1088 or www.FDA.gov/medwatch. You may also contact TerSera Therapeutics at 1-844-334-4035 or [email protected].
Please see PRIALT Full Prescribing Information, including BOXED Warning.
About QUZYTTIR (Cetirizine Hydrochloride Injection)
QUZYTTIR is a second-generation intravenous antihistamine indicated for the treatment of acute urticaria in adults and children six months of age and older. As a selective H1 receptor antagonist, cetirizine works by blocking histamine activity, helping to rapidly relieve symptoms of allergic reactions. QUZYTTIR is administered via intravenous infusion and offers fast onset of action with less sedation compared to first-generation antihistamines.2
IMPORTANT SAFETY INFORMATION
Contraindications
Known hypersensitivity to QUZYTTIR or any of its ingredients, to levocetirizine, or hydroxyzine.
Warnings and Precautions
The occurrence of somnolence/sedation has been reported in some patients. Advise patients to exercise due caution when driving or operating potentially dangerous machinery. Avoid concurrent use of QUZYTTIR with alcohol or other CNS depressants because additional reduction in alertness and additional impairment of CNS performance may occur.
Adverse Reactions
The most common adverse reactions (incidence <1%) with QUZYTTIR are dysgeusia, headache, paresthesia, presyncope, dyspepsia, feeling hot, and hyperhidrosis.
The most common adverse reactions (incidence ≥2%) with chronic dosing of oral cetirizine hydrochloride in adults are somnolence, fatigue, dry mouth, pharyngitis and dizziness. Adverse reactions observed in pediatric patients with chronic use of oral cetirizine hydrochloride are headache, pharyngitis, abdominal pain, coughing, somnolence, diarrhea, epistaxis, bronchospasm, nausea, and vomiting.
Indication and Usage
QUZYTTIR is indicated for the treatment of acute urticaria in adults and children 6 months of age and older.
Limitations of Use: QUZYTTIR is not recommended in pediatric patients <6 years of age with impaired renal or hepatic function.
To report suspected adverse reactions, contact the FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. You may also contact TerSera Therapeutics at 1-844-334-4035 or [email protected].
Please see QUZYTTIR Full Prescribing Information.
(Press release, Esteve, JAN 13, 2026, View Source [SID1234662033])