Abstract
Eperisone hydrochloride (4′-ethyl-2-methyl-3-piperidinopropiophenone hydrochloride) is a muscle relaxant agent, widely used in the treatment of patients with muscular contractures, low back pain or spasticity. Because of its mechanism of action (inhibition of gamma-efferent firing and local vasodilatation activity), side effects on central nervous system are rarely observed. A sensitive liquid chromatography–electrospray ionization-mass spectrometry method for determination of eperisone in human plasma has been developed, with a lower limit of quantification of 0.01 ng/mL. The method was applied to a pharmacokinetic study in 12 healthy volunteers given eperisone 100 mg as single dose on day 1 and three times daily on days 2 to 4. Eperisone was rapidly absorbed after oral administration (T max = 1.6 h) as it was expected by its fast-onset relaxant activity. Moreover, eperisone underwent a rapid elimination from the body (biological half-life 1.87 h), which was not modified during the repeated dosing as suggested by the C max cumulation observed, not different from that expected for a t 1/2 of 1.87 h as suggested by the similar and negligible plasma concentration values (0.063 and 0.067 ng/mL) measured on day 4 before the morning dose and 12 h after evening dose, thus ruling out any potential risk for drug accumulation. Thus, the pharmacokinetic characteristics of eperisone provide further justification for its tolerability in patients with low back pain or spastic palsy, in which the drug is given for periods ranging from few days to several months, respectively.
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Abbreviations
- LBP:
-
Low back pain
- CNS:
-
Central nervous system
- EPS:
-
Eperisone
- PK:
-
Pharmacokinetic
- GI:
-
Gastrointestinal
- T max :
-
Time of maximum concentration
- C max :
-
Maximum plasma concentration
- ng:
-
Nanogram
- mL:
-
Millilitre
- mg:
-
Milligram
- LLOQ:
-
Lower limits of quantification
- LC–MS/MS:
-
Liquid chromatography–mass spectrometry triple quadrupole mass spectrometry
- UCMC:
-
University of Catania Medical Center
- GCP:
-
Good clinical practice
- ECG:
-
Electrocardiogram
- HBV:
-
Hepatitis B virus
- HCV:
-
Hepatitis C virus
- HIV:
-
Human immunodeficiency virus
- t ½ :
-
Plasma concentration half-life
- SPC:
-
Summary of product characteristics
- rpm:
-
Revolutions per minute
- min:
-
minute
- HPLC:
-
High performance liquid chromatography
- ESI:
-
Electrospray ionization
- TOL:
-
Tolperisone
- µl:
-
Microliter
- mM:
-
Millimole
- v/v:
-
Volume to volume
- m/z :
-
Mass to charge
- AUC0–t :
-
Area under the plasma concentration curve administration to last observed concentration at time t
- λ z :
-
Terminal elimination rate constant
- AUC0–∞ :
-
Area under the plasma concentration curve extrapolated to infinity time
- C last :
-
Last quantified concentration
- ANOVA:
-
Analysis of variance
- AUC:
-
Area under the plasma concentration curve
- CV:
-
Coefficient of variation
- SD:
-
Standard deviation
- h:
-
Hour
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We thank Dr. Giacomo Spignoli for his kind help.
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Melilli, B., Piazza, C., Vitale, D.C. et al. Human pharmacokinetics of the muscle relaxant, eperisone hydrochloride by liquid chromatography–electrospray tandem mass spectrometry. Eur J Drug Metab Pharmacokinet 36, 71–78 (2011). https://doi.org/10.1007/s13318-011-0034-0
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DOI: https://doi.org/10.1007/s13318-011-0034-0