JYSELECA was well tolerated in clinical
trials of patients with UC1

Rates of adverse events of special interest in patients on JYSELECA 200 mg during induction (n = 507) and maintenance studies (n = 202).1


Serious infections

Herpes zoster





Malignacies excluding non-melanoma skin cancer

Pulmonary embolism




Gastrointestinal perforations

Venous thromboembolism

Cardiovascular events excluding pulmonary embolism 

Adverse events of special interest during the induction
and maintenance studies1

Reference: 1. Feagan BG, Danese S, Loftus EV Jr, et al. Lancet 2021;397:2372–2384.

Overview of safety profile during the UC maintenance study (Week 11 through Week 58)1

 Two patients in JYSELECA 200 mg group died during the maintenance period: one from asthma, and the other one from left ventricular failure, both considered unrelated to study drug1

Rates of serious adverse events were similar to placebo (<5%)1


The most commonly reported adverse events in the maintenance study, occurring in >5% of patients in any treatment group, were worsening of UC, nasopharyngitis, arthralgia, headache, abdominal pain, and upper respiratory tract infection1

Discontinuation rates were similar to placebo (<5%)1



Reference: 1. Feagan BG, Danese S, Loftus EV Jr, et al. Lancet 2021;397:2372–2384.

Consistent safety profile in patients with rheumatoid arthritis with over 8085 patient-years of exposure in seven clinical studies1-4

Exposure data for rheumatoid arthritis are based on the number of patients with rheumatoid arthritis who have received at least one dose of JYSELECA in seven clinical studies (FINCH 1-4, DARWIN 1-3)

Jyseleca was well tolerated in the integrated analysis with a safety profile that was consistent across the UC and rheumatoid arthritis populations

Over a median of 1.9 and 2.3 and maximum of 5.9 and 6.8 years of exposure, the safety/tolerability of the 100 and 200 mg doses of JYSELECA , respectively, were similar 

Exposure-adjusted incidence rates (per 100 patient years) for adverse events of special interest were similar to or lower than placebo:

• Major adverse cardiac events ≤0.5
• Venous Thromboembolism ≤0.2
• Serious infections ≤2.7
• Herpes Zoster ≤1.6

Safety profile of JYSELECA in clinical studies of patients with UC is consistent with that observed in patients with rheumatoid arthritis

No new safety concerns were identified in the SELECTION induction and maintenance studies

in UC

References: 1. Winthrop KL, Tanaka Y, Takeuchi T, et al. American College of Rheumatology conference 2021. 1698. 2. Winthrop KL, Tanaka Y, Takeuchi T, et al. Ann Rheum 2022;81:184–192. 3. Genovese MC, Winthrop K, Tanaka Y, et al. Ann Rheum Dis 2020;79:324–325. 4. Loftus EV Jr, Genovese M, Winthrop K, et al. UEGW 2020. P0551.

Special Warnings and Precautions for use of JYSELECA

Immunosuppressive medicinal products

Combination of JYSELECA with other potent immunosuppressants such as ciclosporin, tacrolimus, biologics or other Janus kinase (JAK) inhibitors is not recommended as a risk of additive immunosuppression cannot be excluded.


Infections, including serious infections, have been reported in patients receiving JYSELECA. The most frequent serious infection reported with JYSELECA was pneumonia. Among opportunistic infections, tuberculosis, oesophageal candidiasis and cryptococcosis were reported with JYSELECA. The risks and benefits of treatment should be considered prior to initiating JYSELECA in patients:

  • with chronic or recurrent infection
  • who have been exposed to tuberculosis
  • with a history of a serious or an opportunistic infection
  • who have resided or travelled in areas of endemic tuberculosis or endemic mycoses; or
  • with underlying conditions that may predispose them to infection.

Patients should be closely monitored for the development of signs and symptoms of infections during and after JYSELECA treatment. If an infection develops during treatment with JYSELECA, the patient should be carefully monitored and JYSELECA treatment should be temporarily interrupted if the patient is not responding to standard antimicrobial therapy. JYSELECA treatment may be resumed once the infection is controlled.

JYSELECA is not recommended in patients with UC who are aged 75 years and older as there are no data in this population.


Patients should be screened for tuberculosis before initiating JYSELECA. JYSELECA should not be administered to patients with active tuberculosis. In patients with latent tuberculosis, standard antimycobacterial therapy should be initiated before administering JYSELECA. Patients should be monitored for the development of signs and symptoms of tuberculosis, including patients who tested negative for latent tuberculosis infection prior to initiating treatment.

Viral reactivation

Viral reactivation, including cases of herpes virus reactivation (e.g. herpes zoster), were reported in clinical studies. If a patient develops herpes zoster, JYSELECA treatment should be temporarily interrupted until the episode resolves. Screening for viral hepatitis and monitoring for reactivation should be performed in accordance with clinical guidelines before starting and during treatment with JYSELECA. Patients who were positive for both hepatitis C antibody and hepatitis C virus RNA were excluded from clinical studies. Patients who were positive for hepatitis B surface antigen or hepatitis B virus DNA were excluded from clinical studies.


The risk of malignancies is increased in patients with rheumatoid arthritis and ulcerative colitis. Immunomodulatory medicinal products may increase the risk of malignancies. The clinical data are insufficient to assess the potential incidence of malignancies following exposure to JYSELECA. Long-term safety evaluations are ongoing. Malignancies were observed in clinical studies of JYSELECA. The risks and benefits of JYSELECA treatment should be considered prior to initiating treatment in patients with a known malignancy other than a successfully treated non-melanoma skin cancer (NMSC) or when considering continuing JYSELECA treatment in patients who develop a malignancy.

Non-melanoma skin cancer

NMSCs have been reported in patients treated with JYSELECA. Periodic skin examination is recommended for patients who are at increased risk for skin cancer.


In animal studies, decreased fertility, impaired spermatogenesis and histopathological effects on male reproductive organs were observed. The potential effect of JYSELECA on sperm production and male fertility in humans is currently unknown. The reversibility of these potential effects is unknown. The potential risk of reduced fertility or infertility should be discussed with male patients before initiating treatment.

Haematological abnormalities

Absolute neutrophil count (ANC) <1 × 109 cells/L and absolute lymphocyte count (ALC) <0.5 × 109 cells/L were reported in ≤1% of patients in the rheumatoid arthritis clinical studies and in <3% of patients in the ulcerative colitis clinical studies. Treatment should not be initiated, or should be temporarily interrupted, in patients with an ANC <1 × 109 cells/L, ALC <0.5 × 109 cells/L or haemoglobin <8 g/dl observed during routine patient management.


Use of live vaccines during, or immediately prior to, JYSELECA treatment is not recommended. It is recommended that immunisations be updated in agreement with current immunisation guidelines prior to initiating JYSELECA treatment.


Treatment with JYSELECA was associated with dose-dependent increases in lipid parameters, including total cholesterol, and high-density lipoprotein (HDL) levels, while low-density lipoprotein (LDL) levels were slightly increased. LDL cholesterol returned to pre-treatment levels in the majority of patients who started statin therapy while taking JYSELECA. The effect of these lipid parameter elevations on cardiovascular morbidity and mortality has not been determined.

Cardiovascular risk

Patients with rheumatoid arthritis and UC have an increased risk for cardiovascular disorders. JYSELECA should be used with caution in patients with cardiovascular risk factors. Patients should have risk factors (e.g. hypertension, hyperlipidaemia) managed as part of usual standard of care. 

Venous thromboembolism

Events of deep venous thrombosis (DVT) and pulmonary embolism (PE) have been reported in patients receiving JAK inhibitors including JYSELECA. JAK inhibitors should be used with caution in patients with risk factors for DVT/PE, such as older age, obesity, a medical history of DVT/PE, or patients undergoing surgery, and prolonged immobilisation. If clinical features of DVT/PE occur, JYSELECA treatment should be discontinued and patients should be evaluated promptly, followed by appropriate treatment.

Lactose content

Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose–galactose malabsorption should not take this medicinal product.