A Phase 1 interventional study of Zoledronic Acid Injection, 5.0 mg, single dose and Zoledronic Acid Injection, 2.5 mg, single dose in Chronic Kidney Disease, Osteoporosis and Dialysis, sponsored by University of Campinas, Brazil. Not yet recruiting at 1 site in Brazil. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-09-10.
Sponsored by University of Campinas, Brazil · Phase 1, Interventional, and Treatment
Osteoporosis is a frequent complication of chronic kidney disease (CKD) on dialysis, with an estimated prevalence of approximately 40%. It is associated with increased fracture risk, reduced quality of life, and higher mortality. Despite available therapies, management often remains suboptimal, partly due to limited evidence on the safety and pharmacokinetics of bisphosphonates in this population. Objectives: To understand the pharmacokinetics of zoledronic acid in CKD patients on dialysis, as well as to analyze its effects on biomarkers of bone metabolism, bone mineral density (BMD), and clinical outcomes. Materials and Methods: This prospective clinical study involves 24 adult individuals, 8 with CKD-associated osteoporosis (control group; estimated glomerular filtration rate (eGFR) ≥ 35 mL/min/1.73 m²) and 16 with CKD-associated osteoporosis anuric on dialysis patients. Individuals undergoing dialysis will be assigned to receive zoledronic acid at doses of 2.5 mg or 5 mg intravenously (single dose, at the beggining of dialysis session), while patients with CKD-associated osteoporosis (control group; estimated glomerular filtration rate (eGFR) ≥ 35 mL/min/1.73 m²) will receive 5 mg, also in a single dose. Serial blood samples will be collected after infusion, during dialysis session and again up to 96h after dialysis session initiation. The dialysate will be continuously sampled in a tank and aliquots collected for further analysis. The plasma levels of zoledronic acid will be calculated from blood and dialysate samples using liquid chromatography mass spectrometry. The primary outcome is the plasma concentration-time curve of zoledronic acid during a regular dialysis session. Secondary outcomes are: (i) plasma concentration of zoledronic acid up to 96h;(ii) the total mass of zoledronic acid extracted by the dialysate; (iii) the dialytic clearance of zoledronic acid. Evaluation of bone biomarkers (e.g., PTH, alkaline phosphatase, calcium, phosphorus, CTX, and P1NP) and BMD (assessed by bone densitometry) will be performed at baseline and at 12 months. The study will be conducted at the UNICAMP Clinical Hospital, with the participation of one participating center, subject to prior approval from the respective Research Ethics Committees. All participants will be included only after signing the Informed Consent Form. Data will be anonymized and processed in accordance with the General Data Protection Law (LGPD). Expected results: To characterize the pharmacokinetic profile and establish the best dosage regimen of zoledronic acid in patients with CKD on dialysis; to observe the impact of the drug on biomarkers of bone metabolism and BMD.
3,090 studies on the registry are indexed under Renal Insufficiency, Chronic; 698 are open to participants now.
This study's planned enrollment of 24 is below the median of 73 across 2,157 interventional studies indexed under Renal Insufficiency, Chronic.
Browse Renal Insufficiency, Chronic studies →University of Campinas, Brazil is the lead sponsor of 168 studies on the registry; 12 are open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CKD-associated osteoporosis in patients with eGFR \>= 35 mL/min, allocated to receive conventional dose (5 mg, single dose).
Drug: Zoledronic Acid Injection, 5.0 mg, single dose
CKD-associated osteoporosis in patients on dialysis, allocated to receive reduced dose (2.5 mg, single dose), at the beginning of dialysis session.
Drug: Zoledronic Acid Injection, 2.5 mg, single dose
CKD-associated osteoporosis in patients on dialysis, allocated to receive conventional dose (5 mg, single dose), at the beginning of dialysis session.
Drug: Zoledronic Acid Injection, 5.0 mg, single dose
Zoledronic Acid Injection, 5.0 mg, single dose for patients with CKD-associated osteoporosis with eGFR \>= 35 mL/min.
Zoledronic Acid Injection, 2.5 mg, single dose, for patients with CKD-associated osteoporosis on dialysis, at the beginning of dialysis session.
Zoledronic Acid Injection, 5.0 mg, single dose, for patients with CKD-associated osteoporosis on dialysis, at the beginning of dialysis session.
Area Under the Curve of zoledronic acid (ng.mL/mL)
Area under the curve of the plasma concentration-time curve of zoledronic acid
Time frame: From the start of dialysis session to ninety six hours (96 hours) post- drug administration.
Total mass of zoledronic acid extracted by the dialysis
Zoledronic acid mass (mg)
Time frame: From the dialysis session start to the end of session at four hours (4h)
Plan to share: No
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