The "nice" thing about getting something while traveling in a foreign country is that you can often walk in to a pharmacy and buy stuff over the counter that you'd need a prescription for in the US. I was in Quito, Ecuador for a few days in 03 before flying to the Galapagos. I had a sinus infection (okay, not exactly a "cold") flare up that I'd been dealing with a few weeks before the trip. My doctor back home had given me antibiotics for the original diagnosis, but I had used them up. I went to a pharmacy and loaded up on amoxycillin and codeine, fixed me up within 2 days and I didn't have to worry about being miserable for a week in the islands.