As you have pre-packed referral doses for oral use, you should also have the recommended doses and the method given for parenteral use! If it does not go with the cure then it is better not to give it, it's gone missing the laws and the rules on medicines produced!
If there is no production year and the expiration date of the ampoule, then it must be a black market and it should not be given to the patient because it is obviously produced on the black market!
And my final advice is for you: only tablets and ampoules for parenteral use that have a clear manufacturer's declaration, date of manufacture, expiry date of drug, dosage and dosage form, description of undesirable effects of drug action, Prescribes the law of each state individually is ok!
Drugs that do not have it from the black market and can not be given to patients because it is contrary to the common practice and laws regulating that area!