Biphalin (acetate) is an opioid peptide analog capable of crossing the blood-brain barrier and contains two active enkephalin pharmacophores. This compound exhibits high affinity for opioid receptors. In models of acute, neuropathic, and chronic pain in animals, biphalin (acetate) has demonstrated analgesic effects. Additionally, biphalin (acetate) serves as an antiviral, antiproliferative, anti-inflammatory, and neuroprotective agent.