Is It Ok to Take Normal Medications After Getting Botox? Like Allergy Medication?

You should be able to take your regular medicines, (as prescribed by your physician), after Botox treatment.  Some medicines may increase the risk of bruising.  Best to ask your regular doctor if he/she has any concerns.

There is no interference with allergy medication on Botox's effectiveness or duration.  The allergy medication is not adversely affected by having any botox injected.

Yes, Botox is extremely safe when injected properly and should not have any adverse effecdts with other medications. 

Botox and Dysport are safe to use in combination with benadryl.  It is always wise to review any medications you are taking with your injector prior to treatment, particularly as there are some that can increase your risk for bruising.

Having said that, it is always best if you check with your actual doctor, the person who is responsible for taking care of you.  That office should not be too busy to answer your very reasonable question.