Mosunetuzumab Side Effects

Medically reviewed by Drugs.com. Last updated on Mar 19, 2024.

Applies to mosunetuzumab: intravenous solution.

Serious side effects of Mosunetuzumab

Along with its needed effects, mosunetuzumab may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking mosunetuzumab:

More common

• Abnormal or decreased touch sensation
• agitation
• back pain
• blue lips and fingernails
• blurred vision
• body aches or pain
• bone pain
• burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
• burning, numbness, tingling, or painful sensations
• chest pain or tightness
• chills
• confusion as to time, place, or person
• cough
• coughing that sometimes produce a pink frothy sputum
• decrease in amount of urine
• difficulty in moving
• dizziness
• drowsiness
• ear congestion
• fast, noisy breathing
• fever
• frequent or painful urination
• hallucinations
• headache
• holding false beliefs that cannot be changed by fact
• increased sweating
• irritability
• joint pain
• loss of voice
• mental depression or anxiety
• muscle aches, cramps, pain, or stiffness
• neck pain
• nerve pain
• nightmares or unusually vivid dreams
• pain or tenderness around the eyes and cheekbones
• pale skin
• rapid or irregular heartbeat
• seizures
• sneezing
• sore throat
• stiff neck
• stomach pain
• stuffy or runny nose
• swelling
• swelling of the hands, ankles, feet, or lower legs
• swollen joints
• trembling and shaking of the hands
• trouble breathing
• trouble performing routine tasks
• trouble sleeping
• unsteadiness or awkwardness
• unusual excitement, nervousness, or restlessness
• unusual tiredness or weakness
• vomiting
• weakness in the arms, hands, legs, or feet
• weight gain

Incidence not known

• Black, tarry stools
• bleeding gums
• blood in the urine or stools
• lower back or side pain
• painful or difficult urination
• pinpoint red spots on the skin
• ulcers, sores, or white spots in the mouth
• unusual bleeding or bruising

Other side effects of Mosunetuzumab

Some side effects of mosunetuzumab may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

• Diarrhea
• dry skin
• itching skin

For Healthcare Professionals

Applies to mosunetuzumab: intravenous solution.

General

-The most common adverse reactions with a frequency of 20% or greater were cytokine release syndrome , fatigue , rash , pyrexia , and headache.

-Adverse reactions that required dosage interruption in greater than or equal to 5% of patients included neutropenia, infection, and cytokine release syndrome.^[Ref]

Dermatologic

Rash included rash erythematous, exfoliative rash, rash macular, rash maculo-papular, rash papular, rash pruritic, rash pustular, erythema, palmar erythema, dermatitis, and dermatitis acneiform.^[Ref]

Very common (10% or more): Dry skin (16%), pruritus (21%), rash (39%)

Common (1% to 10%): Skin exfoliation^[Ref]

Gastrointestinal

Very common (10% or more): Abdominal pain (12%), diarrhea (17%), nausea (17%)^[Ref]

Abdominal pain included lower abdominal pain and abdominal discomfort.^[Ref]

Genitourinary

Urinary tract infection included urinary tract infection and acute pyelonephritis.^[Ref]

Common (1% to 10%): Urinary tract infection^[Ref]

Hematologic

Very common (10% or more): Decreased lymphocyte count (100%), decreased hemoglobin (68%), decreased neutrophils (58%), decreased platelets (46%), decreased white blood cells (60%)^[Ref]

Immunologic

Very common (10% or more): Cytokine release syndrome (44%)^[Ref]

Metabolic

Very common (10% or more): Uric acid increased (22%)

Frequency not reported: Tumor lysis syndrome^[Ref]

Musculoskeletal

Very common (10% or more): Arthralgia (11%), musculoskeletal pain (28%)^[Ref]

Musculoskeletal pain included back pain, myalgia, musculoskeletal chest pain, and neck pain.^[Ref]

Nervous system

Very common (10% or more): Dizziness (12%), headache (32%), peripheral neuropathy (20%)

Frequency not reported: Motor dysfunction^[Ref]

Headache included headache and migraine. Peripheral neuropathy included peripheral sensory neuropathy, paresthesia, dysesthesia, hypoesthesia, burning sensation, and neuralgia. Dizziness included dizziness and vertigo. Motor dysfunction included ataxia, gait disturbance and tremor.^[Ref]

Oncologic

Frequency not reported: Tumor flare

Other

Fatigue included asthenia, and lethargy. Edema included edema peripheral, peripheral swelling, face edema, swelling face, pulmonary edema, fluid overload, and fluid retention.^[Ref]

Very common (10% or more): Chills (13%), decreased platelets (46%), decreased phosphate (78%), decreased magnesium (33%), edema (17%), fatigue (42%), increased glucose (42%), increased aspartate aminotransferase (39%), increased alanine aminotransferase (32%), increased gamma-glutamyl transferase (34), pyrexia (29%)

Frequency not reported: EBV viremia, sepsis^[Ref]

Psychiatric

Very common (10% or more): Insomnia (12%)

Frequency not reported: Mental status changes, anxiety^[Ref]

Renal

Frequency not reported: Renal insufficiency^[Ref]

Respiratory

Very common (10% or more): Dyspnea (11%), cough (22%), upper respiratory tract infection (14%)

Frequency not reported: COVID-19, pneumonia^[Ref]

Cough includes cough, productive cough, and upper airway cough syndrome. Dyspnea included dyspnea and dyspnea exertional. Upper respiratory tract infection includes upper respiratory tract infection, nasopharyngitis, sinusitis, and rhinovirus infection.^[Ref]

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

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