If you know a friendly doc (I live with one), you could get prescriptions for small quantities of helpful prescription drugs for extended trips. We did that (had one of her partners write the scrip to be totally up and up) for a 16-day, 12-person Grand Canyon trip. My old edition of Medicine for Mountaineers had a suggested list of drugs for an expedition. It has to be a doctor who trusts your judgement and you have to present yourself as being able to use them carefully and appropriately. And don't even ask about morphine. We got some, but had two MDs on the trip, not only BPer types. Besides, my wife hiked out of Nepal for two days with a bad break on only Advil so you can too.
And, if there's any over-the-counter meds you ever use - get them now, I guess. Small quantities are helpful to have backpacking, but I'm thinking the 1000-pill bottles at Walmart or Costco. Must drugs are much more stable than their "shelf life" implies, otherwise, they'd keep them all in the fridge. Just keep them in a cool, dry place.
Going a little off-thread here, but it's a GREAT TRICK: Let's say you're on a flight at 33,000 feet and someone needs a drug - nitroglycerin, valium, benadryl, etc. Those other 150 people on the plane are a walking pharmacy! Just have the flight attendent ask on the PA and you shall receive. People DO NOT want that flight diverted! The same is often true on the trail. Don't tell people your solution "Do you know where a pharmacy is?" Tell them your problem: e.g. "My child has hives." I crushed half a benadryl, put it in strawberry yogurt and had instant Children's Benadryl for them.
Back on thread now: prescription glasses count, right? So perscription sunglasses would too, maybe? I bet the optomitrist wouldn't mind getting paid early. Or prescription swim goggles? I just a set for $69 on eBay because we're going to Hawaii in March. Get some for everyone in the family. Use the "buy-it-now" option so you'll have spent it in 2011.