Honestly, the DIS is NOT the place when seeking advice about importing medication into a different country. All might mean well -allthough nowadays you never know- but assumptions are running rampant and will be of no help what so ever when you do get checked. Same goes with those in the medical profession. Very quick to hand out opinions as facts, but boy are most of them closer to pure nonesense than truth. The only source to get your information and trust would be the gouvernment of the country/countries your visiting. In this case the US. They are the ones that gouverns their legislation, carries out the checks upon them and acts upon violations which can include "oops, didn't know any better but am of no ill intent".
Let me put it this way; most of the times it will not get closely checked, if checked at all. Most people will conclude that simply because they did X and did not get checked or more, doing X thus is legal. It is not, it means nothing more or less than they have not been checked and there being no 100% checks at US borders. Same with knowing where to go. For instance; TSA only deals with flight safety and handing over any smuggling voilations if they stumble upon it. They don't deal with legally importing, international smuggling etc. So whatever info they give is no value when it comes to being allowed to take certain meds into the US and if yes; what paperwork might or might not be needed. It's the CPB that deals with that department. First step always is checking if something is approved for usage within the US. If not, it does not matter how or why you use it, no way you will be allowed to legally bring it along. You can easily check this by using the FDA website. Check not just brandnames as they tend to differ per country. Checking on substance name is the way to go. If that is not readily available on your meds/box/bottle already, consider ordering one load for your vacation of those that do have it on there as it will make things a lot more easy when you do get checked for all involved.
I never go any further than this by stating "you can bring along X, Y, Z by........", simply because things can change and I believe it's the individuals responsibility to check up on this and I don't like even hinting not doing that on anything I say. Basically things can vary from being able to bring along as long as it's in the orginal packaging (indentification!!) to needing to get certain paperwork or more in order right upto never being allowed to legally important certain medications. In this it might be eye opening to learn how many medications nowadays are abused and dealed in. Just knowing that will open eyes to how seemingly "harmless" meds can require some hoops to jump to in order to try and regulate some. It also paints a picture that better explains why things can become so serious when one does not have the right stuff in order "for just some harmless pills prescribed and ok-ed by my doc".
Just on trips to the US, I've had my meds checked multiple times and actually actively struck up a conversation about it with some CPB workers at the beginning since it was so challenging the first time to get the right info (tip; the US is unfortunately one of those countries where their Ambassies etc. know nothing about the subject, CPB and mailing or faxing is also challenging, so ended up chasing some folks down by phone). I have to summarize those experiences with the statement that I'm just glad I did invest my time to get things strated out and did not just go on what was being assumed online, decided by whomever with a medical and/or pharmacy degree or I would've been in quite some situation.
This isn't just something when it comes to travel to the US, it is something we should be aware of on any trip that involves crossing any border. Yes, also within the EU. Something "simple" as ADHD-medication, antidepressants, anticonvulsives etc. etc. can require very strict policies to legally take your meds along. Even within Europe there are destinations where you need to get approval prior to travel through Ministries and what not more.
I've actually found the legislation of the US to be pretty OK to work with, a lot less demanding that many other destinations but as most countries they will not just shrug it off when things are not in order and they do check it and sent you on your merry way within 15 seconds.
As far as how it travels; ALWAYS keep meds in your carry on. It is never worth the risk of loss but also theft -again; running rampant for both abuse and monetairy reasons- or spoilage. Somehow most folks aren't aware that baggage does not get stored in controled temperatures and not all meds can take burning heat or freezing. Liquid regulations does NOT apply to medications and/or medical equipment (like ready to use caths for instance)/tube feedings etcetc., which is a worldwide exemption. You WILL want to keep it seperately from your 3-1-1- baggy and easy to grab out for checks. On flights to and from the US, medical baggage is excempt from luggage allowance as long as it is not stored combined with regular stuff. So the few folks out there that have a load of medications do not have to resort to check in luggage for their medication on that behalf (most airlines worldwide will actually let this slide, as they do not want to run the risk of meds in checked luggage being lost, damaged etc.). In case of having meds that need to be stored at very specific temperatures or even cooled; never ever fool yourself into believing the airline can take responsibility. They can not and besides; they can not control the temperature of onboard cooling enough. Invest a small amount and get a temperature controled medication travel pouch. VERY much worth the money and making things so much easier. There are options out there that keep meds cooled upto 36 hours or more.
Also consider the fact that you can't control air traffic nor faith. Flights can get cancelled, delayed, rerouted etc. Worst case scenario was perfectly televised in the aftermath of 9/11 with thousands of folks being stranded at Gander for days in end. It can be wise to have a little extra supply of meds with you in case of delay etc. I have yet to find a country that does not allow this, allthough there are those that limit you to "reasonable amounts".
For those wanting to carry meds around outside while out and about; Florida has some legislation that might sound........ different for us. Nothing big for just a simple tylenol, but might be worth looking into when using "harder" stuff.
And oh well, while I'm going on anway; be aware of the meds you use and the likelyhood of residu of it being on your body when finding yourself getting a pat down combined with swaps. Not the standard procedure unless you can't use the regular security booths but can result in interesting situations if the officer happens to swap juuuuuuuust the right places. Have had MCO security alarms go off on me twice before because of this combo (wheelchairuser, so pat down and swap are the norm). One because they swapped directly on the area where I had my opiate patch and once they swapped a part of my chair that apparently had a small residu of some other meds on it that I apparently spilled in the days before but was too small to see. Again no biggie after providing the proper paperwork and having all of my carry ons checked millimeter by millimeter but no fun 95!!! minutes to have to spend. I've learn a nice lesson since.
Remember to inform TSA-agent beforehand where my patch is located so they can avoid swapping it and replace wheelchair fabric right before flights.
xx
and that Ondansetron was very expensive in the states (which i later found out) and sold well!! This had me really shaken up,I went to the hospital as no doctor would prescribe it even with the script 
and that effects sickness alot,plus the antibiotics are so strong they make you sick (hopefully ill be on the bare min to get me through) and eventually off everything.
