Jeffrey Hahn, Extension Entomologist
Drugstore beetles feed on almost anything edible and even a few items that aren't (to people). This includes, but is not limited to, flour and other grain-based products, including bread and breakfast cereals, dried fruits, nuts, and spices, such as dried red pepper, as well as dry pet food. They will also feed on drugs (hence their name), dead insects, hair, leather, paper and books, and horns and antlers. They have even been documented chewing through tin foil, lead sheathing, and wood.
When drugstore beetles are found in a home, the first step in controlling them should be to find out what they are infesting. Because they are able to feed on many items, be sure to make a thorough inspection. Start in the kitchen and check all food items for their presence. However, don't forget about any susceptible items that may be stored in other areas on your home, e.g. pet food. Throw out any infested food material that you find. Keep in mind that there can be more than one infestation source so don't stop looking after you find the first one. For more information on drugstore beetles, see Insect pest of stored foods.