It is permissible for the workplace to deduct something from the employee’s salary to pay off a debt that he owes to them, provided that that is done with the consent of both parties and provided that it will not add up to more than what is owed.

Taking narcotic drugs is not permissible except in the case when there is no alternative to it, based on medical advice. If someone prays at the time of taking it when he is not fully aware, then his prayer is not valid. But if he is aware and understands what he is saying and doing, then his prayer is valid in that case.