It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.
Eculizumab may increase your chance of having serious infections, including a meningococcal infection. Avoid people who are sick or have infections. Tell your doctor right away if you develop headaches, nausea, vomiting, fever, a stiff neck or back, a rash, confusion, muscle aches, or if your eyes have become sensitive to light. Make sure you have received a vaccine to prevent meningococcus infections at least two weeks before you receive this medicine. If you have already received the meningococcal vaccine in the past, your doctor will decide if you need another dose.
Ask your doctor for a patient safety card. This card will list the symptoms of meningococcus infections and what to do if you have them. Carry the card with you at all times. You will need to show the card to any doctor who treats you.
For patients with PNH: When this medicine is stopped you could have red blood cell destruction or breakdown (hemolysis). Your doctor will need to monitor you closely for at least 8 weeks after you stop using this medicine. Be sure to keep all appointments.
For patients with aHUS: Your doctor may also need to check you for at least 12 weeks after stopping treatment with this medicine for blood clots in your small blood vessels called thrombotic microangiopathy (TMA). The signs and symptoms of TMA include chest pain, difficulty with breathing, mental depression or anxiety, or seizures. Call your doctor right away if you notice any of these signs and symptoms.
Eculizumab may cause a serious side effect called an infusion reaction. This can be life-threatening and require immediate medical attention. Tell your doctor or nurse right away if you have chest pain, fever, chills, itching, hives, flushing of the face, rash, dizziness, troubled breathing, or swelling of the face, tongue, and throat within a few hours after you receive it.