Some of the common vaccinations.
Hepatitis A, Hepatitis B, Typhoid, Polio, Yellow Fever vaccination (for travelers arriving from or transiting through any yellow-fever-infected area.
Japanese Encephalitis :
This vaccine is recommended for foreign travelers staying in India for more than 1 month and traveling to rural areas.
For instances of animal bites.
Measles, Mumps, Rubella (MMR):
Visitors born after 1956 who have not been vaccinated should take two doses.
A revaccination is taken every 10 years.
It is advised to carry oral re-hydration salts, as well as anti-diarrhea medicine.
It is quite common, except in high altitudes. Your physician can advise you about anti-malarial medication.