⚠️ Warnings
Myelosuppression
Patients treated with bendamustine hydrochloride may experience myelosuppression. In the event of treatment-related myelosuppression, leucocyte counts, platelet counts, haemoglobin levels and neutrophil counts must be monitored at least once weekly. The next treatment cycle should only be initiated once the following parameters have been reached: leucocyte and/or platelet values > 4,000/µl and > 100,000/µl, respectively.
Infections
Serious and fatal infections, including bacterial infections (sepsis, pneumonia) and opportunistic infections such as Pneumocystis jirovecii pneumonia (PJP), varicella zoster virus (VZV) and cytomegalovirus (CMV), have occurred with the use of bendamustine hydrochloride. Cases of progressive multifocal leukoencephalopathy (PML), including fatal cases, have been reported following the use of bendamustine, particularly in combination with rituximab or obinutuzumab. Treatment with bendamustine hydrochloride may cause prolonged lymphocytopenia (< 600/μl) and low CD4-positive T-cell counts (T-helper cells) (< 200/μl), which may persist for at least 7–9 months after the end of treatment.
Lymphocytopenia and CD4-positive T-cell depletion are more pronounced when bendamustine is combined with rituximab. Patients with lymphopenia and low CD4-positive T-cell counts are more susceptible to (opportunistic) infections after treatment with bendamustine hydrochloride. In case of low CD4-positive T-cell counts (< 200/μl), Pneumocystis jirovecii pneumonia (PJP) prophylaxis should be considered.
All patients should be monitored during treatment for respiratory symptoms and signs. Patients should be advised to promptly report any new signs of infection, including fever or respiratory symptoms. In the event of signs of (opportunistic) infection, discontinuation of bendamustine hydrochloride should be considered.
In patients with new or worsening neurological, cognitive or behavioural signs or symptoms, PML should be considered in the differential diagnosis. If PML is suspected, appropriate diagnostic evaluations should be performed and treatment should be deferred until PML has been excluded.
Hepatitis B reactivation
Hepatitis B reactivation has occurred in patients who are chronic carriers of hepatitis B virus following administration of bendamustine hydrochloride. Some cases resulted in acute hepatic failure or death. Patients should be tested for HBV infection before starting treatment with bendamustine hydrochloride. Patients with positive hepatitis B tests (including those with active disease) should be referred to hepatologists and specialists in the treatment of hepatitis B before initiation of treatment; the same applies to patients who test positive for HBV infection during treatment. HBV carriers who require treatment with bendamustine hydrochloride should be carefully monitored during treatment and for several months after completion for signs and symptoms of active HBV infection (see section 4.8).
Skin reactions
Numerous skin reactions have been reported, including rash, severe skin reactions and bullous exanthema. Cases of Stevens-Johnson syndrome (SJS), toxic epidermal necrolysis (TEN) and drug reaction with eosinophilia and systemic symptoms (DRESS), some of them fatal, have been reported with the use of bendamustine hydrochloride. Patients should be advised by prescribing physicians about the signs of these reactions and should be informed to seek immediate medical attention if these symptoms occur. Some of these cases occurred when bendamustine hydrochloride was administered in combination with other antineoplastic agents; therefore the exact relationship is uncertain. If skin reactions occur, they may progress with continued treatment and their severity may increase. If skin reactions progress, bendamustine should be interrupted or discontinued. In the case of severe skin reactions with suspected association to bendamustine hydrochloride, treatment should be discontinued.
Cardiac disorders
During treatment with bendamustine hydrochloride, serum potassium levels must be carefully monitored in patients with cardiac disorders, and potassium supplements must be administered when K+ < 3.5 mEq/l; ECG monitoring must also be performed. Fatal cases of myocardial infarction and cardiac failure have been reported during treatment with bendamustine hydrochloride. Patients with cardiac disease, including a history thereof, should be carefully monitored.
Nausea, vomiting
Antiemetics may be administered for the symptomatic treatment of nausea and vomiting.
Tumour lysis syndrome
Tumour lysis syndrome (TLS) associated with bendamustine treatment has been reported in patients in clinical studies. This typically occurs within 48 hours of the first dose of bendamustine and, if left untreated, may lead to acute renal failure and death. Before initiating treatment, preventive measures should be considered, such as ensuring adequate hydration, close monitoring of blood chemistry parameters, particularly potassium and uric acid levels, and the use of hypouricaemic agents (allopurinol and rasburicase). Several cases of Stevens-Johnson syndrome and toxic epidermal necrolysis have been reported with concomitant administration of bendamustine and allopurinol.
Anaphylaxis
Infusion reactions to bendamustine hydrochloride occurred frequently in clinical studies. Symptoms are usually mild and include fever, chills, pruritus and rash. In rare cases, severe anaphylactic and anaphylactoid reactions occurred. After the first cycle of treatment, patients must be asked whether they have experienced symptoms suggestive of an infusion reaction. In patients who have previously experienced infusion reactions, preventive measures against severe reactions should be considered during subsequent cycles, including antihistamines, antipyretics and corticosteroids.
Patients who experienced grade 3 or higher allergic reactions were usually not re-challenged with the product.
Contraception
Bendamustine hydrochloride is teratogenic and mutagenic.
Women should not become pregnant during treatment. Men should seek advice regarding sperm preservation before starting treatment with bendamustine hydrochloride due to the possibility of irreversible infertility.
Extravasation
Extravasation injection must be stopped immediately. After brief aspiration, the needle should be removed. The affected tissue area should then be cooled. The arm should be elevated. Additional treatment, such as the administration of corticosteroids, has no clear benefit.
Non-melanoma skin cancer
An increased risk of non-melanoma skin cancer (basal cell carcinoma and squamous cell carcinoma) has been observed in clinical studies in patients receiving bendamustine-containing treatment. Regular skin examinations are recommended in all patients, especially those with risk factors for skin cancer.
Dilution
Bendamustine Accord requires appropriate dilution before use. The concentration of bendamustine in Bendamustine Accord 25 mg/ml concentrate for solution for infusion differs from other bendamustine-containing products (for further dilution instructions, see section 6.6).