Some embodiments of the invention include methods for treating an animal for fibrosis comprising one or more administrations of one or more compositions comprising one or more opioid receptor inhibitors. Other embodiments of the invention further include other fibrosis treatments. Still other embodiments of the invention include methods for treating a human for idiopathic pulmonary fibrosis, comprising administering one or more compositions comprising naltrexone and optionally administering one or more compositions comprising pirfenidone, nintedanib, or both. Additional embodiments of the invention are also discussed herein.
