I'm planning to go around April.
It looks like the diseases I should be most cautious about are yellow fever, rabies, malaria and dengue fever.
There's also Hepatitis A,B, Typhoid,measles/mumps/rubella, diphtheria/pertussis/tetanus and poliovirus.
I've just spoken to a friend who lives there and he says yellow fever and hepatitis are the ones to look out for.
As far as I know from what I've read there are no obligations by Peruvian immigration for anyone to have vaccinations to enter the country. A visa is only required if you are staying longer than 90 days.
I think it's probably best to speak to a doctor and see what they think is neccessary, then find out what's in the vaccines I would possibly be taking, and then find out whether or not they have any adverse effects on interaction with an maoi. Or I could ask my doctor ?
EDIT* Sorry bluesky I posted that before I saw your post, it's now definitely what I'm going to do to be 100% safe
Everything I say is actually false and I'm not real.