For Important Safety Information, click here: http://bit.ly/2HZy8WZ. For full Prescribing Information, including Patient Information, click here: http://bit.ly/2HYTJhS. IMPORTANT SAFETY INFORMATION Do not use TECFIDERA if you have had an allergic reaction (such as welts, hives, swelling of the face, lips, mouth or tongue, or difficulty breathing) to TECFIDERA or any of its ingredients. Before taking and while you take TECFIDERA, tell your doctor about any low white blood cell counts or infection