Tacrolimus

Tacrolimus – Test Details & Clinical Use

What is Tacrolimus?

Tacrolimus is an immunosuppressant drug used primarily to prevent organ transplant rejection and treat autoimmune diseases. It works by inhibiting T-cell activation, reducing the body’s immune response.


Why is the Tacrolimus Test Done?

This test measures the Tacrolimus level in blood to ensure:
Effective immunosuppression (preventing organ rejection)
Avoiding toxicity (high levels can cause kidney and neurological damage)
Adjusting dosage based on individual metabolism

Who Needs Tacrolimus Monitoring?

  • Organ transplant patients (kidney, liver, heart, lung)
  • Patients with autoimmune diseases (e.g., lupus, rheumatoid arthritis)
  • Those taking Tacrolimus for graft-versus-host disease (GVHD) in bone marrow transplants

How is the Tacrolimus Test Performed?

Sample Type: Blood (usually from a vein)
Best Time to Test: Before the next dose (trough level) for accurate monitoring
Results Time: Usually within 24 hours


Therapeutic Range of Tacrolimus (May vary by lab and condition)

Condition Therapeutic Range (ng/mL)
Kidney Transplant 5 – 15 ng/mL
Liver Transplant 5 – 20 ng/mL
Heart Transplant 8 – 20 ng/mL
Autoimmune Diseases 5 – 10 ng/mL

⚠️ Levels above 20 ng/mL may indicate toxicity!


Interpreting Tacrolimus Test Results

Low Tacrolimus Levels

🚨 Risk: Organ rejection due to insufficient immunosuppression
🔹 Possible Causes:

  • Missed dose or incorrect dosing
  • Drug interactions (e.g., Rifampin increases metabolism)
  • Rapid drug metabolism (genetic variations)

High Tacrolimus Levels

🚨 Risk: Toxicity (kidney damage, neurotoxicity, high blood pressure)
🔹 Possible Causes:

  • Overdose or incorrect dosing
  • Liver dysfunction (reduced drug clearance)
  • Drug interactions (e.g., Azole antifungals, Macrolide antibiotics, and Grapefruit juice increase Tacrolimus levels)

Common Side Effects of Tacrolimus

🔸 Nephrotoxicity (kidney damage)
🔸 Neurotoxicity (tremors, headaches, confusion, seizures)
🔸 High blood pressure
🔸 Increased blood sugar (risk of diabetes)
🔸 Electrolyte imbalances (low magnesium, high potassium)


Factors Affecting Tacrolimus Levels

Diet: Avoid grapefruit juice, as it increases Tacrolimus levels
Other Medications: Some drugs increase or decrease Tacrolimus metabolism
Liver & Kidney Function: Tacrolimus is metabolized in the liver (CYP3A4 enzyme) and excreted by the kidneys

Original price was: ₹2,000.00.Current price is: ₹1,499.00.

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