Primary Objectives: * To determine the excretion balance and systemic exposure of radioactivity after oral administration of \[14C\]-sodium valproate (VPA) . * To determine the pharmacokinetics of sodium VPA and metabolite(s) and its contribution to the overall exposure of radioactivity. * To collect samples in order to determine the metabolic pathways of sodium VPA and identify the chemical structures and main excretion route of the main metabolites. Secondary Objective: To assess the clinical and biological tolerability of oral solution of sodium VPA.
Total study duration is 3 to 10 weeks, including a screening period of 8 to 28 days, treatment period of up to 15 days and a follow-up and end of study of up to 4 weeks.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
5
Pharmaceutical form:Powder for oral solution reconstituted with water Route of administration: Oral
Investigational site number
Nottingham, United Kingdom
Percentage of radioactive dose excreted in urine and feces
Fractional and cumulative percentage of radioactive dose excreted in urine and feces
Time frame: Day 1 to Day 43
Assessment of key metabolite(s) of sodium valproate
key metabolite(s) of sodium valproate will be assessed in plasma, urine and feces.
Time frame: Day 1 to Day 43
Assessment of PK parameters: Cmax
Maximum plasma or blood concentration observed
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: tmax
Time to reach Cmax (tmax)
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: AUClast
Area under the plasma concentration versus time curve calculated from time zero to the real time, tlast (time corresponding to the last concentration above the limit of quantification, Clast (AUClast)
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: AUC
Area under the plasma concentration versus time curve extrapolated to infinity (AUC)
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: t1/2z
Terminal half-life associated with the terminal slope (λz) (t1/2z) in plasma, blood radioactivity and plasma VPA
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: B/P (blood/plasma radioactivity ratio)
Blood to plasma radioactivity ratio calculated at each time point
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: RCmax (VPA to radioactivity ratio for plasma Cmax)
RCmax is calculated as Cmax(VPA)/Cmax (radioactivity)
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Assessment of PK parameters: RAUC (VPA to radioactivity ratio for plasma AUC)
RAUC is calculated as AUC(VPA)/AUC (radioactivity)
Time frame: Day 1 to 8, Day 12 to Day 15, Day 22, Day 29, Day 36, Day 43
Safety- Adverse Events
Adverse events, spontaneously reported by the subject or observed by the Investigator from day -1 to day 43
Time frame: From day -1 to 43
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