Skip to main content

Mosunetuzumab Side Effects

Medically reviewed by Drugs.com. Last updated on Feb 12, 2025.

Applies to mosunetuzumab: intravenous solution.

Important warnings This medicine can cause some serious health issues

Intravenous route (solution)

Warning: Cytokine Release Syndrome. Cytokine release syndrome (CRS), including serious or life-threatening reactions, can occur in patients receiving mosunetuzumab-axgb.

Initiate treatment with the mosunetuzumab-axgb step-up dosing schedule to reduce the risk of CRS.

Withhold mosunetuzumab-axgb until CRS resolves or permanently discontinue based on severity.

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 side effects

  • 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 side effects

Managing side effects (general information)

For healthcare professionals

Applies to mosunetuzumab: intravenous solution.

General adverse events

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]

Gastrointestinal

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

Genitourinary

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

Hematologic

Immunologic

Metabolic

Musculoskeletal

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

Nervous system

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

Other

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

Psychiatric

Renal

Respiratory

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]

References

1. (2022) "Product Information. Lunsumio (mosunetuzumab)." Genentech

Further information

Mosunetuzumab side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Note: Medication side effects may be underreported. If you are experiencing side effects that are not listed, submit a report to the FDA by following this guide.

Medical Disclaimer