Approved by the FDA, Infliximab-dyyb is an antibody given intravenously to treat Crohn's disease, plaque psoriasis, ankylosing spondylitis, ulcerative colitis, and some types of arthritis. According to medicinenet.com, Infliximab-dyyb works by “blocking the effects of tumor necrosis factor alpha, a substance made by cells of the body which has an important role in promoting inflammation”. Bear in mind that before you take this injection, you need to tell your doctor if you have a weak heart, or if you are taking any drugs, in order to make sure that none of them will compromise the effectiveness of Infliximab-dyyb. You should also tell them if you are pregnant or breastfeeding so as to get their professional advice on whether or not you should take this treatment. As far as the side effects of Infliximab-dyyb are concerned, drugs.com lists them as follows: allergic reaction, fever, chills, painful urination, high/low blood pressure, weakness on one side of the body, loss of eyesight, irregular heartbeat, among others. You should, of course, get immediate medical help when you experience any of the aforementioned side effects.