Get emergency medical help if you have signs of an allergic reaction to Tecartus: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
A common but serious side effect of this medicine is called cytokine release syndrome (CRS). Tell your caregivers right away if you have signs of this condition: fever, chills, dizziness, confusion, vomiting, diarrhea, fast heartbeats, trouble breathing, or feeling very weak or tired. Your caregivers will have medication available to quickly treat CRS if it occurs.
Call your doctor at once if you have:
severe drowsiness;
trouble speaking or writing;
trouble with daily activities;
a seizure;
severe ongoing nausea, vomiting, or diarrhea;
low blood cell counts - fever, chills, tiredness, mouth sores, skin sores, easy bruising, unusual bleeding, pale skin, cold hands and feet, feeling light-headed or short of breath;
kidney problems - little or no urination, swelling in your feet or ankles, feeling tired or short of breath; or
fluid build-up in or around the lungs - pain when you breathe, feeling short of breath while lying down, wheezing, gasping for breath, cough with foamy mucus, cold and clammy skin, anxiety, rapid heartbeats.
You may need to be treated in a hospital if you have certain side effects.
Common Tecartus side effects may include:
slurred speech;
fever, chills, cough, or other signs of infection;
feeling tired or light-headed;
fast or irregular heartbeats;
tremor, problems with speech or muscle movement;
headache, muscle or joint pain;
nausea, loss of appetite;
diarrhea, constipation;
swelling, kidney problems;
rash; or
sleep problems (insomnia).
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Tecartus side effects (more detail)
