The objective of the study was to evaluate whether or not there is a substantial pharmacokinetic interaction between diclofenac and tramadol in a new formulation of a fixed-dose combination of diclofenac 25 milligrams (mg) and tramadol 25 mg for oral administration. The study was conducted in healthy participants of both genders.
After a screening period of about 2 weeks, 36 eligible healthy men and women were randomly allocated to receive 3 sequential treatments in the following order: * a single dose of diclofenac followed by a single dose of the fixed-dose combination of diclofenac/tramadol followed by a single dose of tramadol * a single dose of tramadol followed by a single dose of the fixed-dose combination of diclofenac/tramadol followed by a single dose of diclofenac. There were washout periods of 7 days between treatments. Sixteen blood samples were collected per participant: at pre-dose and 0.16, 0.33, 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 24 and 36 hours after administration of each of the study drugs. The pharmacokinetic parameters and relative bioavailabilities of diclofenac and tramadol (and of the tramadol metabolite M1) were determined for the new fixed-dose combination product and were compared to the single compound reference products. Furthermore, the safety (frequency of adverse events) and tolerability of the new fixed-dose combination of diclofenac 25 mg and 25 mg tramadol in healthy men and women was assessed.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
36
Diclofenac sodium 25 mg Tablets (Laboratorios Tecnandina S.A., Ecuador)
Tramadol hydrochloride 25 mg Tablets (Laboratorios Tecnandina S.A., Ecuador)
Fixed-dose combination tablet containing diclofenac sodium 25 mg and tramadol hydrochloride 25 mg (Laboratorios Tecnandina S.A., Ecuador)
Clinical Unit of Biodextra, S.A. de C.V.
Mexico City, Mexico
Maximum plasma concentration (Cmax) of diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. Diclofenac concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Maximum plasma concentration (Cmax) of tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from the administration until the time t (AUC0-t) of diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. Diclofenac concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from the administration until the time t (AUC0-t) of tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Maximum plasma concentration (Cmax) of tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol M1 concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from the administration until the time t (AUC0-t) of tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol M1 concentrations were determined using validated analytical methods.
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Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from 0 to infinity (AUC0-inf) of tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from 0 to infinity (AUC0-inf) of tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tramadol M1 concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Area under the plasma concentration curve from 0 to infinity (AUC0-inf) of diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. Diclofenac concentrations were determined using validated analytical methods.
Time frame: From pre-dose to 36 hours post-dose
Time to maximum plasma concentration (Tmax) for tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tmax was calculated based on Cmax data for tramadol.
Time frame: From pre-dose to 36 hours post-dose
Time to maximum plasma concentration (Tmax) for tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tmax was calculated based on Cmax data for tramadol M1.
Time frame: From pre-dose to 36 hours post-dose
Time to maximum plasma concentration (Tmax) for diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. Tmax was calculated based on Cmax data for diclofenac
Time frame: From pre-dose to 36 hours post-dose
Elimination half life (t half) for tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. t half was calculated based on plasma concentration data for tramadol.
Time frame: From pre-dose to 36 hours post-dose
Elimination half life (t half) for tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. T half was calculated based on plasma concentration data for tramadol M1.
Time frame: From pre-dose to 36 hours post-dose
Elimination half life (t half) for diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. t half was calculated based on plasma concentration data for diclofenac.
Time frame: From pre-dose to 36 hours post-dose
Elimination rate constant (KE) for tramadol
16 plasma samples were collected from pre-dose to 36 hours post-dose. KE will be calculated based on the plasma concentrations for tramadol.
Time frame: From pre-dose to 36 hours post-dose
Elimination rate constant (KE) for tramadol metabolite M1
16 plasma samples were collected from pre-dose to 36 hours post-dose. KE was calculated based on the plasma concentrations for tramadol M1.
Time frame: From pre-dose to 36 hours post-dose
Elimination rate constant (KE) for diclofenac
16 plasma samples were collected from pre-dose to 36 hours post-dose. KE will be calculated based on the plasma concentrations for diclofenac.
Time frame: From pre-dose to 36 hours post-dose