Diarolyte sachets are essential as you are bound to get a tummy upset at some point or a bit dehydrated due to the heat. Plasters, antiseptic wipes, cream and that 'no wash' hand gel were all useful to us when we went a few years ago. I always have calpol with us too. Chemists are really helpful in egypt but i would rather take the stuff from home iyswim hth
their chemists are great, very educated and sspeak better English than us LOL You can buy just about anything over the counter, but I second the gel stuff, use it after EVERY time you handle money and before eating and you will be fine.
Anti-bacterial cleaning wipes - if you do any tours or such like it's worth a swipe over tables, bus armrests etc. Peppermint foot spray - again, for the tours and the long walking. Loo roll - once more with the tours - you'd be shocked how many times you'd wished you'd brought some...
well, I had the opposite problem when on red sea the first time. I had nothing against constipation!! I was avoiding fruits and vegs,so I guess it was my fault. So don't forget something soft for constipation!!!