Atenolol is generic form of tenormin (atenolol). why do i feel as though tenormin (atenolol) works better and its stronger? same 25mg on both. but definitely different.

Possible: Generics may be made by multiple manufacturers, and although the active chemical ingredient should be the same, fillers and delivery systems. although most modern day generics are virtually interchangeable with brand name drugs, in some cases, it is important to stick to the brand name, or at least try a generic from a different manufacturer.