While I haven't yet been to Africa, a couple other things already in my mind to remember: hemorrhoid cream/ointment, anti-chaffing powder (corn starch, Gold Bond, Anti-Monkey Butt, etc), maybe skin glide (I used it a few years ago when I tried running, and the inside of my arms and sides just below the armpit got friction burns from rubbing).
Would it be advisable to (if possible to obtain) double the prescriptions necessary and have half in carry-on and half checked? Just in case lost or stolen, you're still covered and don't have to try to obtain there. Particularly for very remote locations.