Welcome to HCM,
Thanks for your query,
You took post exposure vaccine
for Rabies, there are 4 or 5 injection of ARV and you started after you last injection.
I have seen all the medicines they are for allergy and hyperacidity
and most of them are immunosuppressive drug
.The only drug is montelukast
which is used for allergy anti leukotrienes immunosuppression
is rare in normal individuals.
There should not be any problem with protection against Rabies.
If required you can take necessary medicines and please do not worry as by this time immunity already developed against Rabies.
Just relax I don't think immunosuppression is an issue in your case.