Glasses are often cheaper overseas, although in Roma YMMV on the cost.

If it's something you -really- need, whether it's a controlled substance or not, always bring a duplicate prescription just in case you lose it when in the states. If it's not a controlled substance, just the bottle + doc info on it usually suffices. If it becomes an issue, they have a pill database to check the brand names, official names and what the pills really look like so someone isn't smuggling Vicodin in a bottle for Penacillin.

Please note that docs and pharmacies in the US cannot honor foreign written prescriptions but in a pinch, it's better than having nothing at all.

Another thing I do is I seperate the pills between two bottles (same labeling) because if I lose one bottle somewhere, I always have a small amount for backup purposes.

Also, brand names are often different overseas than in the US although not in all cases. Most docs in the US write prescripts with the official medical name vs. the advertised name, may want to research if the brand name is the same in your home country as it is in the USA. Plus, most people don't know the official name but the brand name so if it differs, a doc could be confused.