Clinical trial Recruiting at 1 site Phase 1 Interventional Ages 18 to 50

Personalized Acyclovir Dosage for Obese Patients

Official title: Individualization of Dosage Regimens in Obese Patients: Application to Acyclovir

Run by University Hospital, Toulouse · NCT05589688 · Data updated 2026-11-12

This study is testing how body weight affects the way obese patients process acyclovir to find the best dosage for their treatment.

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years to 50 Years
SexAll
Enrollment20 (estimated)
SponsorUniversity Hospital, Toulouse
Academic / other
Locations1 site (Toulouse)
StatusRecruiting
StartedApril 9, 2024
Main results expectedDecember 2026
Study endsDecember 2026
Registry record updatedDecember 31, 2025
Trial IDNCT05589688 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates include healthy volunteers aged 18 and older with a BMI between 18 and 39.9 kg/m2.

Probably not a fit

Patients with nephrotoxic conditions or those on medications that affect acyclovir pharmacokinetics may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This study aims to evaluate how lean body mass affects the elimination of acyclovir in obese patients. It will involve healthy volunteers categorized into four groups based on their BMI: non-obese, overweight, and two grades of obesity. By measuring plasma and urine concentrations, researchers will develop a pharmacokinetic model to better understand the appropriate dosage regimens for acyclovir in these populations. The goal is to ensure effective and safe treatment for obese patients who may not respond well to standard dosages.

Why it matters

Potential benefit: If successful, this study could lead to more effective and safer dosing guidelines for acyclovir in obese patients.

How similar studies have gone: While there is limited data on personalized dosing for acyclovir in obese patients, similar pharmacokinetic studies have shown promise in optimizing drug regimens for various populations.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* healthy volunteers with a BMI between 18 and 39,9 kg/m2, divided into 4 groups: 5 non-obese volunteers (BMI between 18 and 24,9 kg/m2), 5 overweight volunteers (BMI between 25 and 29,9 kg/m2), 5 volunteers with grade 1 obesity (BMI between 30 and 34,9 kg/m2) and 5 volunteers with grade 2 obesity (BMI between 35 and 39,9 kg/m2),
* volunteers with a aGFR \> 50 ml/min,
* with a good venous pathway for kinetics,
* women on contraception or postmenopausal women,
* person who has given written consent and affiliated with the public health insurance.

Exclusion Criteria:

* volunteers with nephrotoxic co-prescriptions and/or co-prescriptions that would modify the pharmacokinetics of acyclovir like diuretics, NSAIDs or statins,
* having presented serious allergies to a drug (e.g. angioedema...), with large parenchyma insufficiencies (e.g., hepatic insufficiency, heart failure...),
* with diabetes or taking anti-diabetics due to the possible deterioration of renal function in diabetic patients,
* with arterial hypertension or taking antihypertensive drugs due to the possible modification of renal clearance by modification of blood flow,
* drug interactions with acyclovir (H2 receptor antagonists (e.g., Cimetidine), Probenecid, Mycophenolate Mofetil, Lithium, Anti-calcineurins (Ciclosporin, Tacrolimus)),
* volunteers taking anticoagulants,
* hypersensitivity to acyclovir,
* pregnant woman,
* participation in another clinical study in the last two months
* volunteers with ongoing viral HSV/VZV infection treated with acyclovir,
* adults under guardianship or other legal protection, deprived of their liberty by judicial or administrative decision

Where it's running

  • Toulouse Hospital
    Toulouse, France
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.