THE STAMINA OF DRUGS

Traditionally, when peptides are taken orally, such as hormones and ne urotransmitters, their effects are often suppressed because they are q uickly degraded by the digestive system. Moreover, when peptides are d elivered by intravenous injection, they are usually rapidly cleared fr om the blood circulation. In recent years, the introduction of non-pep tide molecules has enabled the drugs to have a longer period of action within the body's system.