For a topical pain killer that is easily available here, comes in an unscented version ( so you don’t end up a smelling like an old aunt using Ben Gay ) , and contains diclofenac which is strangely enough only available as a prescription in the US ( might have changed recently ):
VOLTAREN EX Gel ボルタレンEXゲル
http://www.voltaren-ex.jp/p_product/gel.html
http://archive.is/3QJMf
INGREDIENTS
diclofenac sodium 10 mg
menthol 30 mg
Price
50 mg package is around JPY1400
25 mg package is around JPY900
There should be cheaper generic drugstore brands too - just check the labels.
Voltaren® Gel
A useful rub-on anti-inflammatory medication
updated October 15 2016 (first published 2009)
by Paul Ingraham, Vancouver, Canada
Think of Voltaren® Gel as “ibuprofen in a gel.” (It’s actually diclofenac, but ibuprofen is a much more familiar drug name in North America, where the product is still fairly new, and available only with a prescription in the US.) It’s a topical anti-inflammatory medication,NSAID and FDA-approved to treat osteoarthritis in “joints amenable to topical treatment, such as the knees and those of the hands.” The evidence shows that it “provides clinically meaningful analgesia.” This is an appealing treatment idea that actually works reasonably well: what a pleasure to be able to say that!