Just googled the situation and this is what I managed to find out.
"I am traveling or living temporarily in the U.S. and I need to have my prescription medicine sent to me. What should I do?
As a general rule, the Food and Drug Administration (FDA) does not allow prescription medications to be mailed to the U.S. However, if you are here temporarily and need to be sent your prescription medication, there are a couple of things you should do. Ask your physician to write a letter explaining that you are under their care, and that they have prescribed the drugs for your use. The letter should also explain the circumstances for sending the drugs to you, including that you are a citizen of (whatever) country, that you are temporarily in the U.S. (for travel, study, etc.) and have either run out of your medications, lost them, etc. The letter should accompany the package and be addressed to a CBP Officer or broker.
We strongly recommend that it be in English. If the medicine is sent through the mail, it could be informally detained by CBP until an FDA Inspector is available to examine it. This can take as long as a month. It is very important that the outside package be marked with a statement that the package contains a physician's letter so that the CBP Officer will be more proactive in bringing it to the FDA's attention. A better option is to send the package by a courier service. Ask the courier service how best to flag the package so that their U.S. Customs broker will be able to tell the FDA about the special circumstances for sending the package. For more information please email the FDA Import/Export Team at
cderimportexport@fda.hhs.gov. See the FDA Regulatory Procedures Manual for Importations for more information.
Finally
if none of that works, get a prescription in the US. Contact your travel health insurance provider (and maybe also your health insurance provider at home) for where to go. I imagine that bringing results from tests done at home, diagnosis and other relevant documents might greatly facilitate the process and save you from added costs."
Good luck, You may get lucky and a local clinic will just write the prescription based on the empty puffer. Call your DD insurance first and ask them how to proceed would be my suggestion.