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Hello from JustAnswer.
The pethidine is a controlled substance and it is not legal to obtain it online without a prescription. It would require a doctor to prescribe the drug.
If you could explain the situation in more detail, then further comment may be possible.
I have not received any further information about the situation, so am unable to make any further comment, however, it would be illegal to buy pethidine without a prescription.
If any additional information would be helpful, please let me know.