Theres probably some rule against prescription meds but its a non controlled substance so i think absolutely worst case scenario is you just lose the package
So, theoretically if you wanted to send someone some for example, "non-prescription OTC estrogen supplements" all you need to do is ensure you are responsibly shipping it such as via USPS is make its not toxic, expired, or labelled as another medicine.
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Just use cotton balls to prevent rattling.