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Phenergan suppositories will melt in the tropical heat, and my wife hates having to look at a suppository sitting next to her food...so I carry a couple single dose vials of injectable Phenergan. It also works well for migraines which my wife is prone to, but it is VERY sedating for some people.
I like powdered liquid forms of antibiotics for several reasons: With a 6 year old boy aboard, I can adjust the correct dose easier for a child than if I had to try to break a tablet. Also, tablets can often start to fall apart in the humidity. If you bring tablets, have them in "blister packs" or in the factory sealed container. Once you open it, the tablets may degrade rather quickly so you're better off having several smaller quantities than one big stock bottle of 100 tablets.
Amoxicillin is cheap and pretty safe, but because it is so popular, there is alot of resistance to it. At home I prescribe it all the time, knowing that maybe 10 or 15 percent of the time a sinus infection or ear infection might be resistant to it.
Vancomycin is not absorbed orally, so cannot be used in tablet form except for a few types of bowel infections. As an injectable, the dosing is tricky and can cause kidney damage, so it is not appropriate for use on a sailboat where you cant do lab tests.
Azithromycin is a great choice for most respiratory infections: ear infections, bronchitis, or even pneumonia. It is sometimes OK for skin infections, but probably not urinary infections.
The reason I suggested levofloxacin is that it generally covers all of the above common infections. Only problem is that it's not recommended in children, so for my son, I bring along alternatives. It is also fairly expensive compared to the generic antibiotics, but I think worth the cost to be able to carry only one medication that treats so many infections effectively.
If you are under 45 or so and not otherwise at high risk for heart disease, I'd probably skip the Nitroglycerine for exactly the reason you describe: it loses effectiveness rapidly. If you need to carry it, ask about Nitrospray. You can get it in a little spray bottle that you just squirt under your patient's tongue and it has a little better shelf life, I think.
Vicodin (hydrocodone) and Percocet (oxycodone) are pretty equal in my mind in terms of pain relief and addictive potential. I got very nauseated once from oxycodone when I had a cervical strain so that's the only reason I choose Vicodin. But Percocet is ranked slightly higher in addictive potential by the DEA, so prescribing laws are slightly tighter (you can't phone in a refill to a pharmacy, for example, while you can for Vicodin) So that might be another plus for Vicodin.
Whew, this is starting to feel like I'm taking a board exam again. Hope that helps and may you never need to use any of this stuff.