Cough, headache, back pain, or diarrhea may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high.
Fingolimod may increase the risk of skin cancer and lymphoma. Tell your doctor right away if you notice any new or changing skin growths/moles, or swollen lymph nodes.
This medication can weaken your immune system/increase the risk of infection while you are taking it and for 2 months after your last dose. You may be more likely to get a serious (possibly fatal) infection (such as bronchitis, pneumonia, herpes). Tell your doctor right away if you develop any signs of an infection such as persistent cough/sore throat, difficulty breathing, fever/chills, cold/flu symptoms, sores, or blisters. Do not start fingolimod if you already have an infection.
Fingolimod may increase the risk of a rare (possibly fatal) brain infection (progressive multifocal leukoencephalopathy-PML). This may sometimes occur even after treatment has stopped. Symptoms of PML can seem like a worsening MS attack. Tell your doctor right away if you have any new or worsening symptoms that have lasted for several days, such as clumsiness or problems with strength, balance, speech, eyesight, or thinking.
Get medical help right away if you have any very serious side effects, including: shortness of breath, chest pain, severe dizziness/fainting, slow/irregular/pounding/fast heartbeat, unusual tiredness/weakness, eye pain/sensitivity to light, vision changes (such as blurred vision, blind spot/shadows in the center of your vision, color changes), mental changes (such as sudden confusion), seizure, sudden/severe headache.
This medication may rarely cause serious liver problems. Tell your doctor right away if you experience: nausea/vomiting that doesn't stop, loss of appetite, stomach/abdominal pain, yellowing eyes/skin, dark urine.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.