It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly. Blood and urine tests may be needed to check for any unwanted effects.
Symptoms of your MS may return and become worse after stopping treatment with this medicine. Do not stop using this medicine without checking first with your doctor.
Using this medicine while you are pregnant can harm your unborn baby. Use an effective form of birth control to keep from getting pregnant during treatment with this medicine and for 1 week after the last dose. If you think you have become pregnant while using this medicine, tell your doctor right away.
This medicine may increase your risk of developing infections, including a herpes infection or a serious brain infection called meningitis or progressive multifocal leukoencephalopathy. Avoid being near people who are sick or have infections while you are using this medicine. Wash your hands often. Also tell your doctor if you have ever had an infection that would not go away or an infection that kept coming back.
This medicine may cause heart rhythm problems. Tell your doctor right away if you get dizzy or lightheaded, have a fast, slow, or irregular heartbeat, or feel like fainting.
Tell your doctor right away if you have a cough, trouble breathing, chest tightness, or any type of breathing problem with this medicine. These could be symptoms of a serious lung problem.
Check with your doctor right away if you have pain or tenderness in the upper stomach, pale stools, dark urine, loss of appetite, nausea, vomiting, or yellow eyes or skin. These could be symptoms of a serious liver problem.
Your doctor will check your blood pressure on a regular basis while you are using this medicine. Tell your doctor right away if you have a severe headache, lightheadedness, or changes in your vision.
This medicine may increase your risk of having skin cancer (eg, basal cell carcinoma, melanoma, squamous cell carcinoma). Tell your doctor right away if you notice any skin nodules, patches, or open sores that do not quickly heal. Avoid exposure to sunlight. Wear sunscreen with a high sun protection factor. Do not use sunlamps or tanning beds.
Check with your doctor right away if blurred vision, difficulty with reading, or any other change in vision occurs during or after treatment. Your doctor may want your eyes be checked by an ophthalmologist (eye doctor).
Tell your doctor right away if you have seizures, headache, confusion, vision problems, unusual drowsiness, tiredness, or weakness. These could be symptoms of a serious nervous system problem called posterior reversible encephalopathy syndrome (PRES).
While you are being treated with ponesimod, and after you stop treatment with it, do not have any immunizations (vaccinations) without your doctor's approval. Do not use this medicine 1 to 2 weeks before and for 4 weeks after receiving a vaccine. Ponesimod may lower your body's resistance and there is a chance you might get the infection the immunization is meant to prevent. In addition, other persons living in your household should not take oral polio vaccine since there is a chance they could pass the polio virus on to you. Also, avoid persons who have taken oral polio vaccine within the last several months. Do not get close to them, and do not stay in the same room with them for very long. If you cannot take these precautions, you should consider wearing a protective face mask that covers the nose and mouth.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.