| ANOVA | Analysis of Variance statistical test |
| AUC | Area Under the concentration Curve |
| Cmax | Maximal Concentration of the drug |
| HL | Elimination Half Life |
| IV | Intravenous |
| F | Female |
| M | Male |
| MOR | Morphine Opioid Receptor |
| M1 | Metabolite of Tramadol, O-desmethyl-Tramadol |
| NSAID | Non-Steroidal Anti-Inflammatory Drug |
| PK | Pharmacokinetics |
| R (formulation) | Reference Medication (oral) |
| REec | Spanish Register of Clinical Trials |
| Tmax | Time until Cmax is reached |
| T1 to T4 (formulations) | Medication tests 1 to 4 |
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