no, undrentide. Those are very commonly sold products in the USA, even in supermarkets.
In Japan I have never seen Pepto Bismol, so pack some tablets if you don't want the weight of a liquid. As for Midol, it's light enough to carry, too. Other painkillers are here in most drugstores (like Bufferin, Tylenol, and an ibuprofen product called Eve, perhaps one or 2 others), all with recognizable English labels. But why can't you pack them yourself?