If you're planning to have an adventure then you should definitely prepare yourself for a few injuries. Sri Lanka has an incredible range of places to explore, from tropical beaches, historic monuments to national parks with lush jungle terrain. Regardless of whether you chose not to embark on a particularly adventurous voyage, it is always best to be prepared for injury. If you're not used to the hot sun, ibuprofen or aspirin will go a long way in relieving headaches and would even provide some relief to pain related to sun-burns. It'll be also good to have some sort of anti-diarrheal or gastritis medicine such as Daigene in case you're unable to handle the spicy food. Lastly, never forget to carry a pack of band-aids.