What is the filler or binder in Benadryl?

In Benadryl, the active ingredient is diphenhydramine, while the fillers or binders can vary by formulation. Common fillers include substances like lactose, starch, and magnesium stearate, which help in the tablet's stability, consistency, and ease of manufacturing. These excipients aid in the delivery of the active ingredient but do not contribute to the therapeutic effect. Always check the specific product label for precise ingredient details.