Drugs › Selective T cell costimulation blocker
Brand name · Belatacept
Nulojix: adverse event reports filed with FDA
1,846 reports list it as a suspect or interacting product, 2011–2026. Class: Selective T cell costimulation blocker.
- 1,846
- reports as suspect product
- 0% of all reports · about 124 a year
- 165
- reports, 12 months to June 2026
- 150 in the 12 months before
- 53%
- marked serious by the reporter
- 74.5% across the class
- 11.5%
- record death among outcomes, as reported
- 213 reports · not verified by FDA
1,846 adverse event reports received by FDA list the brand name Nulojix (belatacept) as a suspect or interacting product, from August 2011 to June 2026. A further 99 reports list it only as a concomitant medication, and those are not counted in the figures on this page.
In the 12 months to June 2026, 165 reports listed it, up 10% from 150 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Over its reporting history that is about 124 reports a year and 0% of the 20,646,523 reports in the database, and 44.7% of the reports for the selective T cell costimulation blocker class. How many people take it is not in the data, so a count is not a rate of occurrence.
The MedDRA terms listed most often are product storage error (9.4%), hospitalisation (6.3%) and death (5.9%). A report can list several reactions, so shares add to more than 100%; 262 different terms appear across these reports. Product storage error is recorded in 9.4% of these reports, a larger share than in the median selective T cell costimulation blocker drug (4.7%).
53% of the reports are marked serious by the reporter (74.5% across the class); 11.5% record death among the outcomes and 27.3% record hospitalisation, as reported. 34.3% of the reports came from pharmacists, and the largest patient age group is 45 to 64 (18%). FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."
Reports by month, five years
Reports by the month FDA received them. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.
By year received
2026 covers reports received through June 2026 only.
Reactions recorded in the reports
share of Nulojix reports recording the termmedian drug in selective t cell costimulation blocker
- Product storage errorthe product was stored wrongly9.4%174
- Hospitalisationadmission to hospital6.3%117
- Deaththe patient died; cause not stated by this term5.9%108
- Off label useused for a purpose or in a way not on the label5.5%102
- Kidney transplant rejection3.9%72
- Product preparation issuea problem preparing the product3.1%58
- Transplant rejection2.9%53
- Adverse eventan unwanted medical event, type not specified2.7%50
- Intentional product use issuedeliberate use not as intended2.4%44
- Acute kidney injurysudden loss of kidney function1.7%32
- Incorrect product storagethe product was stored wrongly1.6%30
- Product dose omission issuea dose was missed1.5%28
- Covid-19COVID-19 infection1.4%26
- BK virus infection1.2%23
- Leukopenialow white blood cells1.2%23
- Diarrhoealoose or frequent stools1.2%22
- Pyrexiafever1%19
- Sepsisa severe body-wide response to infection1%18
- Vomitingbeing sick1%18
- Headachehead pain0.9%17
- Abdominal painstomach or belly pain0.9%16
- Fatiguetiredness0.9%16
- Prescribed underdose0.9%16
- Septic shockshock arising from infection0.9%16
- Urinary tract infectionbladder or urinary infection0.9%16
- Weight increasedweight gain0.9%16
- Anaemialow red blood cells0.8%15
- Drug ineffectivethe medicine did not work as expected0.8%15
Top 30 of 262 MedDRA preferred terms recorded across these reports, with a plain-language gloss where one is available. One report can record several terms. The hollow bar is the median share across the 2 drugs in the selective t cell costimulation blocker class; it describes the reports, not the patients. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."
Outcomes recorded
Outcome flags as the reporter set them; a report can carry several, and "other serious" is FDA's own category for serious reports outside the named outcomes. Grey bar: all 4,131 reports in the class. FDA has not verified any outcome and states that the reports "cannot be used to estimate the incidence of these events."
Patients and reporters
Patient age
Patient sex
Who reported
Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 81.3% of reports give the United States as the country of the event or reporter.
Reason for use recorded
| Indication as recorded (MedDRA) | Reports | Share |
|---|---|---|
| Renal transplant | 580 | 31.4% |
| Prophylaxis against transplant rejection | 118 | 6.4% |
| Immunosuppression | 31 | 1.7% |
| Lung transplant | 18 | 1% |
| Transplant | 17 | 0.9% |
| Immunosuppressant drug therapy | 14 | 0.8% |
The indication field is filled in by the reporter and is often blank; shares are of all 1,846 reports.
Drugs most often listed in the same reports
| Drug (any role in the report) | Reports | Share of Nulojix reports |
|---|---|---|
| Prednisone | 216 | 11.7% |
| CellCept | 172 | 9.3% |
| Bactrim | 92 | 5% |
| Myfortic | 89 | 4.8% |
| Amlodipine | 74 | 4% |
| Pantoprazole | 55 | 3% |
| Cortancyl | 53 | 2.9% |
| Tacrolimus | 50 | 2.7% |
| Mycophenolate mofetil | 49 | 2.7% |
| Aranesp | 42 | 2.3% |
Other products listed in reports where Nulojix is a suspect product, whatever their own role. Co-listing means the two were recorded together; it says nothing about either product's part in the event. Only the 2,500 most-reported names are counted here.
In context
| Measure | Nulojix | Selective T cell costimulation blocker | All reports |
|---|---|---|---|
| Reports as suspect product | 1,846 | 4,131 | 20,646,523 |
| Share of that pool | — | 44.7% | 0% |
| Reports, latest 12 months | 165 | — | 1,332,454 |
| Marked serious | 53% | 74.5% | 57.4% |
| Death recorded among outcomes, per 1,000 reports | 115 | 166 | 91 |
| Hospitalisation recorded, per 1,000 reports | 273 | 382 | 213 |
| Consumer-filed share | 20.6% | 15.1% | 45.8% |
| Top term, share of reports | Product storage error 9.4% | median 4.7% | 0.4% |
Shares are of reports, not of patients treated. The number of people taking a product is not in the data, so none of these figures is a rate, and differences between columns reflect who takes a product, who reports and how long it has been sold. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."
Other drugs in the selective t cell costimulation blocker class
| Drug | Name type | Reports | Latest 12 months | Marked serious |
|---|---|---|---|---|
| Belatacept | generic | 2,285 | 172 | 91.9% |
Ordered by report count for navigation only. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic." A brand and its generic are separate rows because reporters name them separately.
Questions about Nulojix reports
How many adverse event reports has FDA received for Nulojix?
1,846 reports list Nulojix as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 165 of them arrived in the latest 12 months. Another 99 list it only as a concomitant medication.
What reactions are recorded in Nulojix reports?
product storage error (9.4%), hospitalisation (6.3%), death (5.9%), off label use (5.5%) and product preparation error (4.6%). These are MedDRA preferred terms coded from what the reporter described; a report can list several, and a term's presence is not a finding that Nulojix was responsible.
How serious are the reports?
53% are marked serious by the reporter. Among the outcomes recorded, 11.5% of reports include death and 27.3% include hospitalisation. FDA has not verified these outcomes and states that the reports "cannot be used to estimate the incidence" of the events.
Who files these reports?
pharmacist (34.3%), other health professional (26.1%) and consumer or non-health professional (20.6%). Most reports reach FDA through the manufacturer, which must forward reports it receives.
Are reports for Nulojix rising?
165 reports in the 12 months to June 2026, up 10% from 150 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Counts also move with how many people take a product, its time on the market and publicity.
Do these reports show that Nulojix was responsible for these reactions?
No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event." The reaction may relate to the condition being treated, to other medicines, or to something else.
Is this a list of the side effects of Nulojix?
No. It is a count of what was reported to FDA. The adverse reactions observed in clinical studies are printed on the FDA-approved label, which a pharmacist or clinician can go through with you.
How do I report an adverse event?
Consumers and health professionals can report to FDA through MedWatch (Form FDA 3500 online, or 1-800-FDA-1088), or to the manufacturer, which must pass reports on. See the guide on how to report.
Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. A report counts here when it lists Nulojix as a suspect or interacting product; reports listing it only as a concomitant medication (99) are excluded. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.
Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.