Make sure that all your standard vaccinations are up to date and get all your vaccinations done well in advance of your departure date. Ideally this should be three months in advance.
The World Health Organization (www.who.int/en/) recommends that all travellers be covered for diphtheria, tetanus, measles, mumps, rubella and polio, as well as for hepatitis B, regardless of their destination.
If you are familiar with the health services offered in your host country, you may be able to get some vaccinations for free, as opposed to paying high fees in your home country. Bring an international vaccination certificate, which is available at your local public health department, which lists all your vaccinations. You should also bring information about allergies you may have to certain medications. Many drugs are available worldwide, but not all. So make sure about that as well.
If you are going to an area where there is malaria you will need specialist advice on whether you need to take antimalarias and if you do then what to take, when to start and how to remember them. There is a range of antimalarias available so do take professional advice as to which one will be best for you. And please check the NaTHNaC Health Information Sheet on Malariain your country of destination.