Number one is for number two's- Diarrhoea tablets; two kinds, each one for a specific purpose. Enough said.
Sleeping tablets. I've only used them twice in the past, but was very glad to have them when they were needed.
Malaria tablets. I'm not going to use them as a preventative. If you are very conscious of mosquito protection, you can generally get away with just carrying them as a treatment, should you develop the symptoms.
Mosquito repellant- the strong stuff, not for wimps!
Antiseptic drops- many, many uses.
Gastrolyte sachets- for replenishing electrolytes lost when suffering diarrhoea.
Stemetil- for nausea. No, not to bring it on. To prevent it!
Antibiotics- Cause we all love antibiotics.
Antihystamines- for allergies, motion sickness etc.
Antifungal cream- unless you plan to start a garden in your groin.
Iodine tablets- for purifying water that you are unsure of, when there is no alternative source.
Survival blanket- seems extreme, but takes up almost no space, and only costs a few bucks. I had to use mine on an icy night in Canada, and will never travel without one again.
Sinus tablets- easier to carry a pack with you than try to get a prescription in Timbuktu.
Headache tablets- cause there's always plenty of things to give you a headache. Anyone who has ever drunk Arak will vouch for that!
Sunscreen- you use it at home. Why get burnt just cause you're away?
An assortment of bandages, plasters and swabs- for obvious uses.
Some people may like to carry condoms.*hey, my Mum might be reading this!*
I may yet even shelling out for a little travel thermometer, to self diagnose a fever. Do you know the difference betwen an oral thermometer and a rectal thermometer? *the taste!*