Check in good time before your trip whether the vaccination of all travellers is sufficient for your destination. An overview of the recommended standard vaccinations can be found on the website of WHO - World Health Organisation
Pack a first aid kit, which is available e.g. in pharmacies, in your suitcase. If you carry personal medication with you, check whether it may be necessary to prove your personal needs, for example with a medical certificate.
Also remember that many medicines are temperature-sensitive and may have to be transported refrigerated.