Tacrolimus is an immunosuppressive agent used for prophylaxis of organ rejection post-transplant. Tacrolimus use is in combination with one or, most commonly, two other immunosuppressive medications. It has an application as an agent for as prevention or treatment for certain autoimmune diseases.
In solid organ transplantation, it serves as the treatment of organ rejection in kidney, liver, and heart allogeneic transplants. There is also an off-label indication for the prevention of rejection in lung transplant patients.
Other off-label indications include:
Tacrolimus indications also include topical use in moderate to severe atopic dermatitis, as well as other off-label dermatologic disease states.
Tacrolimus is a calcineurin inhibitor (CNI). It inhibits T-cell proliferation by binding to FK506 binding protein (FKBP).
Tacrolimus can administration can be by oral, sublingual, topical, or intravenous (IV) route. Oral tacrolimus is available in immediate-release (IR) and extended-release (ER: XR and XL) formulations. The various formulations have different pharmacokinetic parameters and are not interchangeable. Doses should be titrated to target trough concentrations.
Prevention of Post-Organ Transplant Rejection (Adult Dosing):
Heart Transplant: In combination with an antimetabolite
Kidney Transplant: Use in combination with an antimetabolite agent
Tacrolimus can be administered with or without food but may occur with food in the presence of GI intolerance. IR doses should be 12 hours apart. Dose rounding should be to a whole number that is feasible with the available strengths. For example, IR tacrolimus comes in 0.5 mg, 1mg, and 5 mg strengths.
Infection may be secondary to immunosuppression and highlights the importance of reducing target doses with careful monitoring to balance the risk of rejection.
Contraindications to tacrolimus include:
Tacrolimus is a narrow therapeutic index drug. Therapeutic monitoring of tacrolimus in transplant patients is a valuable tool in adjusting drug levels. Since tacrolimus use is typically in combination with other immunosuppressants, target levels usually decrease as post-transplant time increases to minimize Calcineurin Inhibitor mediated nephrotoxicity and adverse effects. Whole blood concentrations should be used, drawn typically within 30 minutes before the next dose. Therapeutic levels range from 5 to 20 mcg/mL, though 5 to 15 mcg/mL is often employed to alleviate toxicity while preventing rejection.
Additional monitoring parameters include renal function, hepatic function, serum electrolytes (Mg, Phos, K), glucose, and blood pressure. Parameters should initially be measured two to three times a week post-operatively, gradually decreasing as time passes, achieving target levels, and patient stabilization.
Following are recommendations for tacrolimus level ranges per British Columbia Transplant Guidelines (http://www.transplant.bc.ca/health-professionals/transplant-clinical-guidelines). However, target levels vary by institution, induction protocols, and patient needs.
Adult and Kidney and Kidney/Pancreas Transplant:
Adult Liver Transplant:
Adult Heart Transplant:
Adult Lung Transplant:
Due to tacrolimus' pathway of metabolism, many drug-drug interactions exist. If starting medications that inhibit or induce the metabolism of tacrolimus, added monitoring is suggested to prevent a supra or sub-therapeutic level.
Tacrolimus toxicity commonly presents as acute renal failure. Close monitoring of serum creatinine, GFR, and urine output is necessary for patients on tacrolimus.
Toxicity may also present as the development of adverse effects such as tremors, electrolyte disturbances, headaches, and increased in SCr.
No antidote exists currently to counter toxicity. Hemodialysis does not remove tacrolimus.
Management of post-transplant patients is an interprofessional team endeavor. A combination of the skills and knowledge of each profession contributes to the successful longevity of the transplanted organ, as well as a higher quality of life for the patient. As per the CMS guidelines, an interprofessional team for transplant must include the following disciplines at the minimum:
Awareness of all aspects of the transplant journey, education, and support are at the core of graft longevity. Patients must receive instruction on not only the medical aspects of the transplant, but the financial needs, necessary dietary changes, and effects of the medication. This area is where specialty nursing can play a significant role and counsel the patient appropriately.
Post-transplant, the patient is closely followed by the team, both inpatient and outpatient. Nursing again will be performing the initial dosing of tacrolimus, and of course, they should coordinate with the pharmacy staff regarding proper dosing and administrator. The pharmacy will also perform medication reconciliation, both initially, and as the overall drug regimen changes, to preclude drug interactions. Nursing will also be in the best position to monitor for adverse effects, and report these promptly to the physician in charge of the case. Collaborative, interprofessional evaluations by nursing, medical, and pharmacy of patient's state of health and being, as well as the medication efficacy and adverse effects, allow for thorough vigilance through the eyes and expertise of various professionals. [Level V]
|||Ruzicka T,Assmann T,Lebwohl M, Potential future dermatological indications for tacrolimus ointment. European journal of dermatology : EJD. 2003 Jul-Aug; [PubMed PMID: 12948911]|
|||Thomson AW,Bonham CA,Zeevi A, Mode of action of tacrolimus (FK506): molecular and cellular mechanisms. Therapeutic drug monitoring. 1995 Dec; [PubMed PMID: 8588225]|
|||Vicari-Christensen M,Repper S,Basile S,Young D, Tacrolimus: review of pharmacokinetics, pharmacodynamics, and pharmacogenetics to facilitate practitioners' understanding and offer strategies for educating patients and promoting adherence. Progress in transplantation (Aliso Viejo, Calif.). 2009 Sep; [PubMed PMID: 19813492]|
|||Gaïes E,Salouage I,Sahnoun R,Trabelsi S,Jebabli N,Lakhal M,Klouz A, [Interaction between azole antifugals drugs and tacrolimus in four kidney transplant patients]. Journal de mycologie medicale. 2011 Mar; [PubMed PMID: 24451503]|
|||Staatz CE,Tett SE, Clinical pharmacokinetics and pharmacodynamics of tacrolimus in solid organ transplantation. Clinical pharmacokinetics. 2004 [PubMed PMID: 15244495]|
|||Yu M,Liu M,Zhang W,Ming Y, Pharmacokinetics, Pharmacodynamics and Pharmacogenetics of Tacrolimus in Kidney Transplantation. Current drug metabolism. 2018 [PubMed PMID: 29380698]|
|||Patel N,Cook A,Greenhalgh E,Rech MA,Rusinak J,Heinrich L, Overview of extended release tacrolimus in solid organ transplantation. World journal of transplantation. 2016 Mar 24; [PubMed PMID: 27011912]|
|||Nicolai S,Bunyavanich S, Hypersensitivity reaction to intravenous but not oral tacrolimus. Transplantation. 2012 Nov 15; [PubMed PMID: 23128975]|
|||Takamatsu Y,Ishizu M,Ichinose I,Ogata K,Onoue M,Kumagawa M,Suzumiya J,Tamura K, Intravenous cyclosporine and tacrolimus caused anaphylaxis but oral cyclosporine capsules were tolerated in an allogeneic bone marrow transplant recipient. Bone marrow transplantation. 2001 Aug; [PubMed PMID: 11571519]|
|||Bekersky I,Dressler D,Mekki Q, Effect of time of meal consumption on bioavailability of a single oral 5 mg tacrolimus dose. Journal of clinical pharmacology. 2001 Mar; [PubMed PMID: 11269569]|
|||Philosophe B,Leca N,West-Thielke PM,Horwedel T,Culkin-Gemmell C,Kistler K,Stevens DR, Evaluation of Flexible Tacrolimus Drug Concentration Monitoring Approach in Patients Receiving Extended-Release Once-Daily Tacrolimus Tablets. Journal of clinical pharmacology. 2018 Jul; [PubMed PMID: 29462506]|
|||Doligalski CT,Liu EC,Sammons CM,Silverman A,Logan AT, Sublingual administration of tacrolimus: current trends and available evidence. Pharmacotherapy. 2014 Nov; [PubMed PMID: 25251980]|
|||Romero I,Jiménez C,Gil F,Escuin F,Ramirez E,Fudio S,Borobia A,Carcas A, Sublingual administration of tacrolimus in a renal transplant patient. Journal of clinical pharmacy and therapeutics. 2008 Feb; [PubMed PMID: 18211623]|
|||Randomised trial comparing tacrolimus (FK506) and cyclosporin in prevention of liver allograft rejection. European FK506 Multicentre Liver Study Group. Lancet (London, England). 1994 Aug 13 [PubMed PMID: 7520105]|
|||Pham PT,Pham PM,Pham SV,Pham PA,Pham PC, New onset diabetes after transplantation (NODAT): an overview. Diabetes, metabolic syndrome and obesity : targets and therapy. 2011 [PubMed PMID: 21760734]|
|||Nankivell BJ,PʼNg CH,OʼConnell PJ,Chapman JR, Calcineurin Inhibitor Nephrotoxicity Through the Lens of Longitudinal Histology: Comparison of Cyclosporine and Tacrolimus Eras. Transplantation. 2016 Aug [PubMed PMID: 27306529]|