Why would a transdermal patch such as nitroglycerin be ordered for a patient?

A transdermal patch like nitroglycerin is ordered for a patient to provide a continuous and controlled release of medication, which helps manage conditions such as angina pectoris. This method allows for steady absorption of the drug into the bloodstream, ensuring consistent therapeutic effects while minimizing peaks and troughs associated with oral or injectable forms. Additionally, the patch is convenient and non-invasive, making it easier for patients to adhere to their treatment regimen.