Assessment of the Pharmacokinetic Profile of Tacrolimus Medications and Their Relation to Effectiveness and Safety in Liver Transplant Patients

Summary

The goal of this observational study is oo compare the pharmacokinetic parameters of different tacrolimus containing medications in liver transplant patients. The main question\[s\] it aims to answer are: * Differences in pharmacokinetic parameters of tacrolimus containing medicinal products (TL, TDD and their ratio - C/D) * Changes in liver function parameters compared to baseline. * Change in the estimated glomerular filtration rate (eGFR) compared to baseline. * To assess the possible relation of liver function parameters and eGFR to C/D (blood concentration and daily dosage) * Incidence of acute graft rejection during the study * Incidence of BK and cytomegalovirus (CMV) infection during the study * To assess the intraindividual variability of the TL, TDD and the ratios of these parameters (C/D) * To assess the patient-adherence of therapy based on the BAASIS questionnaire, and prescription filled by individual patients, based on electronic health-care record. Participants will not have to undergo any additional clinical visits or tests except which are required in routine clinical care

Eligibility

Inclusion Criteria:

1. Patients ≥ 18 years of age
2. Patients after liver- or simultaneous liver and kidney transplantation
3. Having received a tacrolimus containing immunosuppressant therapeutic regimen at least for four weeks (induction therapy), and TL is within 5-20 ng/ml before inclusion
4. Patients signed an informed consent form for use of their pseudonymised clinical data within the present non-interventional trial.

Exclusion Criteria:

1. Participation in any clinical trial, 30 days prior to inclusion
2. The patients received liver allograft more than 6 months before inclusion
3. Hospitalisation due to infection, acute rejection, or graft disfunction 2 weeks prior to enrolment
4. Chronic graft insufficiency in the patient's history
5. Use of medications 2 weeks prior to enrolment, or the need for continuous use of medications that are known to significantly affect the pharmacokinetics of tacrolimus containing medications (as CYP3A4 inducers: rifampin, carbamazepine, phenobarbital, and phenytoin, or CYP3A4 inhibitors: erythromycin, ketoconazole, clarithromycin, and verapamil containing medication)
6. Presence of the following comorbidities:

   1. Diseases affecting adherence to therapy (Chronic neurologic conditions, Psychiatric diseases)
   2. Diseases affecting drug absorption and metabolism (Inflammatory bowel disease, Chronic inflammatory diseases of bile ducts, Presence of ascites due to any disease)
7. Patients on waiting list for re-transplantation

Conditions2

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