modelMethadone
Extends from Pharmacolibrary.Drugs.ATC.N.N07BC02.
Information
| name: | Methadone | |
| ATC code: | N07BC02 | route: | oral |
| compartments: | 2 | |
| dosage: | 10 | mg |
| volume of distribution: | 2.4 | L |
| clearance: | 1.4 | L/h/kg |
| other parameters in model implementation | ||
Methadone is a synthetic opioid agonist primarily used for the treatment of opioid dependence and chronic pain. It acts on the same opioid receptors as morphine and heroin, but with a longer duration of action. Methadone is approved and widely used today for maintenance therapy in opioid addiction and for pain management.
Pharmacokinetics
Pharmacokinetic parameters reported in healthy adult subjects after oral administration.
References
Kokubun, H, et al., & Uezono, Y (2020). Population Pharmacokinetics of Methadone after Oral Administration in Japanese Patients with Cancer-Related Pain. Journal of pain & palliative care pharmacotherapy 34(4) 203–210. DOI:10.1080/15360288.2020.1785070 PUBMED:https://pubmed.ncbi.nlm.nih.gov/32870067
Thigpen, JC, et al., & Harirforoosh, S (2019). Opioids: A Review of Pharmacokinetics and Pharmacodynamics in Neonates, Infants, and Children. European journal of drug metabolism and pharmacokinetics 44(5) 591–609. DOI:10.1007/s13318-019-00552-0 PUBMED:https://pubmed.ncbi.nlm.nih.gov/31006834
Wiles, JR, et al., & Vinks, AA (2015). Pharmacokinetics of Oral Methadone in the Treatment of Neonatal Abstinence Syndrome: A Pilot Study. The Journal of pediatrics 167(6) 1214–20.e3. DOI:10.1016/j.jpeds.2015.08.032 PUBMED:https://pubmed.ncbi.nlm.nih.gov/26364984
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Mass | weight (from PK_1C) | 75 | patient weight (kg) |
| Modelica.Units.SI.SpecificVolume | VdPerKg (from PK_1C) | 0.9 | Volume of distribution (L/kg) |
| Modelica.Units.SI.MassFraction | F (from PK_1C) | 0.8 | bioavailiability (0-1) |
| Pharmacolibrary.Types.Clearance | Cl (from PK_1C) | 20 | clearance |
| Modelica.Units.SI.Time | adminTime (from PK_1C) | 60 | first administration time (s) |
| Modelica.Units.SI.Time | adminDuration (from PK_1C) | 600 | administration duration (s) |
| Modelica.Units.SI.Time | adminPeriod (from PK_1C) | 8*60*60 | period of administration (default 8 hours)(s) |
| Pharmacolibrary.Types.Mass | adminMass (from PK_1C) | 1000 | administration mass (mg) |
| Integer | adminCount (from PK_1C) | 8 | number of dose administered (1) |
| Pharmacolibrary.Types.Volume | Vd (from PK_1C) | VdPerKg*weight | Volume of distribution (m3) |
| Pharmacolibrary.Types.MassConcentration | Cmin (from PK_1C) | 0.004 | minimal therapeutic range |
| Pharmacolibrary.Types.MassConcentration | Cmax (from PK_1C) | 0.008 | minimal therapeutic range |
| Pharmacolibrary.Types.MassConcentration | Ctox_peak (from PK_1C) | 0.012 | toxicity peak level |
| Pharmacolibrary.Types.MassConcentration | Ctox_trough (from PK_1C) | 0.006 | toxicity trough level |
| Pharmacolibrary.Types.Volume | Vdp (from PK_2C) | VdpPerKg*weight | Volume of distribution (m3) |
| Modelica.Units.SI.SpecificVolume | VdpPerKg (from PK_2C) | 0.9 | Volume of distribution peripheral(l/kg) |
| Pharmacolibrary.Types.Clearance | k12 (from PK_2C) | 1 | intercompartmental C-P clearance |
| Pharmacolibrary.Types.Clearance | k21 (from PK_2C) | 1 | intercompartmental P-C clearance |
| Pharmacolibrary.Types.TransferRate | ka (from PK_2C_enteral) | 0.016666666666666666 | first order absorption rate |
| Modelica.Units.SI.Time | Tlag (from PK_2C_enteral) | 600 | delay between oral administration and absorption (default 10min) |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Types.ConcentrationOutput | C_central (from PK_1C) | ||
| Interfaces.ConcentrationPort_b | centralCPort (from PK_1C) | ||
| Interfaces.ConcentrationPort_b | peripheralCPort (from PK_2C) | ||
| Pharmacolibrary.Types.ConcentrationOutput | C_peripheral1 (from PK_2C) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Pharmacokinetic.NoPerfusedTissueCompartment | central (from PK_1C) | ||
| Pharmacokinetic.ClearanceDrivenElimination | elim (from PK_1C) | ||
| Sources.PeriodicDose | periodicDose (from PK_1C) | ||
| Modelica.Units.SI.Time | t1_2 (from PK_1C) | elimination half-life | |
| Pharmacolibrary.Pharmacokinetic.TransferFirstOrderNonSym | transfer (from PK_2C) | ||
| Pharmacolibrary.Pharmacokinetic.NoPerfusedTissueCompartment | peripheral (from PK_2C) |
Revisions
- 06/2025 Tomas Kulhanek, generated model from data extracted from PUBMED, DrugBank and LLM(GPT4.1)