Medical & first-aid kit checklist:
acetaminophen (paracetamol) or aspirin
adhesive tape
antibacterial ointment for cuts and abrasions
antibiotics eg ciprofloxacin (Ciproxin) or norfloxacin (Utinor)
antidiarrhoeal drugs (eg loperamide)
antihistamines (for allergic reactions)
anti-inflammatory drugs (eg ibuprofen)
antimalaria pills
bandages, gauze, gauze rolls and tape
DEET-containing insect repellent
digital thermometer
oral rehydration salts
Permethrin-containing insect spray for clothing, tents and bed nets
pocket knife
scissors, safety pins, tweezers
self-diagnostic kit to identify from a finger prick if malaria is in the blood
sterile needles, syringes and fluids if travelling to remote areas
sun block (SPF 30+)
water purification tablets
The above list can be found on Lonely Planet.