Pembrolizumab is used in treating several cancers such as skin cancer, gastric cancer, lung cancer, and head and neck cancer. The brand name of this medication is Keytruda and it is an immunotherapy medication. This injection utilizes the immune system of the person to fight the cancer cells. Keytruda can also be used for the treatment of multiple myeloma. Some of the side effects of Pembrolizumab 100mg are vomiting, skin rash, constipation, muscle cramps, increased weight, or weight loss. Some components of Pembrolizumab can lead to an allergic reaction such as injection site reaction, rashes, and hives. For more information on Pembrolizumab visit us.