Tacrolimus: The Immunosuppressant for Organ Transplant Rejection
Tacrolimus is an immunosuppressant drug that prevents organ rejection after kidney, liver, or heart transplants. By suppressing the immune system, Tacrolimus helps prevent the body from attacking the new organ.
Mechanism of Action
Tacrolimus works by inhibiting calcineurin, a protein that activates T-cells in the immune system. By blocking this activation, Tacrolimus reduces the immune response and helps prevent organ rejection.
Indications
● Organ Transplantation: To prevent organ rejection after kidney, heart, or liver transplants.
● Autoimmune Diseases: Sometimes used for diseases like rheumatoid arthritis and psoriasis.
Dosage and Administration
● Adults: Initial dose of 0.075–0.2 mg/kg/day, usually divided into two doses.
● Pediatric Dosage: Adjusted based on weight, typically starting at 0.03-0.05 mg/kg/day.
Side Effects
● Common: Tremors, headache, high blood pressure, and nausea.
● Serious: Nephrotoxicity (kidney damage), hyperkalemia (high potassium), and increased risk of infections.
Pregnancy Category: Category C – Use with caution during pregnancy.
Common Brands
● Prograf
● Astagraf XL