The purpose of this guidance is to assist sponsors in the nonclinical evaluation of the immunotoxic potential of pharmaceuticals. Immunotoxicity is, for the purposes of this guidance, defined as unintended immunosuppression or stimulation (including hypersensitivity), which can include adverse effects of exaggerated pharmacology of pharmaceuticals that are intended to act as immunomodulators. This guidance applies to drug products, including small molecule drugs and oligonucleotides, as well as certain biological products such as biotechnology-derived therapeutic proteins (referred to herein as biopharmaceuticals). For the purposes of this guidance, the term pharmaceutical will be used as a general term that encompasses all of these product types. Cell and gene therapies, adjuvanted vaccines, and blood products are not within the scope of this guidance. In general, FDA’s guidance documents do not establish legally enforceable responsibilities. Instead, guidances describe the Agency’s current thinking on a topic and should be viewed only as recommendations, unless specific regulatory or statutory requirements are cited. The use of the word should in Agency guidances means that something is suggested or recommended, but not required.
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