Tacrolimus is an immunosuppressant drug used to suppress the immune reaction in patients who have received transplantation. Organ rejection may be a huge concern when transplantation is required. If the organ is rejected, it can lead to other health difficulties and prove fatal. Hence, this drug is given in therapeutic amounts. The issue with Tacrolimus is that it is absorbed differently in different bodies and in different amounts, i.e., before and after food.
Hence this test is done before the patient is taken to therapy.
If the concentration of this drug is consistently above the therapeutic amounts, it can cause tacrolimus toxicity and may prove fatal. Side effects can be present in all amounts, but in the case of high amounts of the drug, the side effects may have deadly side effects like high blood pressure, nausea, headaches, blurred vision, etc. Hence to avoid all these problems, a tacrolimus test is suggested.