Natalizumab Side Effects
What should I watch for?
Your condition will be monitored carefully while you are receiving this medicine. Visit your doctor for regular check ups. Tell your doctor or healthcare professional if your symptoms do not start to get better or if they get worse.
In some patients, this medicine may cause a serious brain infection that may cause death. If you have any problems seeing, thinking, speaking, walking, or standing, tell your doctor right away. If you cannot reach your doctor, get urgent medical care.
Common and Rare Side Effects
Along with its needed effects, a medicine 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:
Body produces substance that can bind to drug making it less effective or cause side effects
difficulty with swallowing
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
tightness in the chest
unusual tiredness or weakness
changes in behavior
difficult or labored breathing
faintness or lightheadedness when getting up suddenly from a lying or sitting position
feeling of warmth
feeling unusually cold
gaseous abdominal or stomach pain
redness of the face, neck, arms, and occasionally, upper chest
thoughts of killing oneself
yellow eyes or skin
Incidence not known
Back, leg, or stomach pains
general body swelling
loss of appetite
Some side effects 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:
blistering, crusting, irritation, itching, or reddening of the skin
bloody or cloudy urine
cracked, dry, scaly skin
difficult, burning, or painful urination
difficulty with moving
feeling sad or empty
frequent, strong, or increased urge to urinate
itching of the vagina or genital area
loss of interest or pleasure
lower back or side pain
muscle pain or stiffness
pain during sexual intercourse
pain in the joints
passing urine more often
stomach soreness or discomfort
thick, white vaginal discharge with no odor or with a mild odor
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.