Key takeaways
Gastrocrom (cromolyn) and Imuran (azathioprine) are both prescription medications, but they serve very different purposes. Cromolyn is used to treat chronic eye allergies and asthma symptoms by stabilizing mast cells to prevent the release of chemicals that cause allergic and asthma symptoms. It comes in several forms, including eye drops, oral solution, and a solution for inhaling through a nebulizer. It is used several times a day and is safe for long-term use, including during pregnancy. On the other hand, Imuran is an immunosuppressant taken orally or via IV, primarily used to prevent kidney transplant rejection and to treat rheumatoid arthritis. Imuran is not a first-choice medication due to its many side effects, including an increased risk of infections and certain cancers. Unlike cromolyn, Imuran requires regular blood tests and has significant warnings about sun exposure and potential liver damage. While cromolyn is generally well-tolerated with minimal side effects, Imuran has more severe and common side effects such as nausea, vomiting, and leukopenia.
