Looks like some meds are being withdrawn because they could be effectively repurposed.
They probably want to avoid another embarrassing Ivermectin/Hydroxychloroquine fiasco whereby a cure is found to exist for their latest ScamDemic. i.e. An existing safe, cheap and effective cure that destroys the fake rationale for their new death jabs.
Diphenhydramine = Benadryl
Azelastine nasal spray = Astepro allergy and decongestant