Life-saving medical treatments often come with heavy physiological costs that extend beyond the targeted organ or disease. New research suggests that caffeine might serve as an unexpected remedy for the severe mood changes associated with a common drug used to prevent organ rejection. The study provides evidence that caffeine can reverse anxiety and depression symptoms in mice treated with cyclosporine, potentially by altering nitric oxide signaling in the brain. The findings were published recently in the journal Physiology & Behavior. Cyclosporine is a powerful immunosuppressive medication utilized globally. Doctors prescribe it frequently to patients undergoing organ transplantation to ensure the body does not attack the new tissue. It is also used to treat certain autoimmune disorders. While effective for the immune system, the drug is known to cause neurotoxicity. This toxicity often manifests as psychological side effects, including elevated anxiety and depressive states. These neuropsychiatric issues can severely impact the quality of life for transplant recipients. The biological roots of these side effects are tied to how cyclosporine works. The drug inhibits a protein called …