Are there any herbs that can help counteract the side effects of an antibiotic, such as lethargy. He was given pharmaceutical medication and it has turned him into a zombie and he's back to not eating.

For the lethargy, you may want to add Multi Essentials to their regimen. It is an herbal multivitamin which can aid in digestion and increase energy levels. Felimm is a wonderful immune support. The herbs would be beneficial for your pet as they can help stimulate the appetite, and improve energy levels. Yucca is also beneficial in helping with appetite stimulant and is also highly nutritive.