The present invention relates to systems, compositions, and methods for the synthesis and use of imaging agents, or precursors thereof. An imaging agent precursor may be converted to an imaging agent using the methods described herein. In some cases, the imaging agent is enriched in .sup.18F. In some cases, an imaging agent may be used to image an area of interest in a subject, including, but not limited to, the heart, cardiovascular system, cardiac vessels, brain, and other organs. In some embodiments, methods and compositions for assessing perfusion and innervation mismatch in a portion of a subject are provided.

The present invention provides a buprenorphine dimer compound, wherein the two buprenorphine portions are linked via an ethylene spacer, wherein the spacer is bonded to the two opioid molecules via an ether bond. Pharmaceutical compositions comprising such a buprenorphine dimer drug are also disclosed, and the use of such compounds in the treatment of gastrointestinal hyperalgesia generally and in particular diarrhea-predominant irritable bowel syndrome.

The present invention provides a buprenorphine dimer compound, wherein the two buprenorphine portions are linked via an ethylene spacer, wherein the spacer is bonded to the two opioid molecules via an ether bond. Pharmaceutical compositions comprising such a buprenorphine dimer drug are also disclosed, and the use of such compounds in the treatment of gastrointestinal hyperalgesia generally and in particular diarrhea-predominant irritable bowel syndrome.

The present disclosure relates to compounds of Formula I that exhibit 5-HT.sub.2A receptor agonist activity and low 5HT.sub.2B receptor agonist activity or deemed 5HT.sub.2B receptor agonist inactivity. In at least some cases, such compounds show selectivity for the 5-HT.sub.2A receptor over the 5-HT.sub.2C receptor. As contemplated herein, phenethylamines may be used for the treatment of neuropsychiatric, neurodegenerative, neuroinflammatory and pain disorders including depression, drug (e.g. tobacco, opiate, and cocaine) addiction, alcoholism, post-traumatic stress disorder (PTSD), and neuropathic pain syndromes including cluster headaches and chemotherapy induced peripheral neuropathy.

The present disclosure relates to compounds of Formula I that exhibit 5-HT.sub.2A receptor agonist activity and low 5HT.sub.2B receptor agonist activity or deemed 5HT.sub.2B receptor agonist inactivity. In at least some cases, such compounds show selectivity for the 5-HT.sub.2A receptor over the 5-HT.sub.2C receptor. As contemplated herein, phenethylamines may be used for the treatment of neuropsychiatric, neurodegenerative, neuroinflammatory and pain disorders including depression, drug (e.g. tobacco, opiate, and cocaine) addiction, alcoholism, post-traumatic stress disorder (PTSD), and neuropathic pain syndromes including cluster headaches and chemotherapy induced peripheral neuropathy.

Provided herein are methods for treating pain such as acute or chronic pain or fever in subject without risking hepatotoxicity. The subject may be at risk of hepatotoxicity if administrated an acetaminophen monomer. The method includes administering a pharmaceutical composition containing an acetaminophen dimer compound, wherein the phenolic hydroxyl groups of two acetaminophen compounds are linked via an ethylene spacer.

The present invention relates to systems, compositions, and methods for the synthesis and use of imaging agents, or precursors thereof. An imaging agent precursor may be converted to an imaging agent using the methods described herein. In some cases, the imaging agent is enriched in .sup.18F. In some cases, an imaging agent may be used to image an area of interest in a subject, including, but not limited to, the heart, cardiovascular system, cardiac vessels, brain, and other organs. In some embodiments, methods and compositions for assessing perfusion and innervation mismatch in a portion of a subject are provided.

The present invention relates to systems, compositions, and methods for the synthesis and use of imaging agents, or precursors thereof. An imaging agent precursor may be converted to an imaging agent using the methods described herein. In some cases, the imaging agent is enriched in .sup.18F. In some cases, an imaging agent may be used to image an area of interest in a subject, including, but not limited to, the heart, cardiovascular system, cardiac vessels, brain, and other organs. In some embodiments, methods and compositions for assessing perfusion and innervation mismatch in a portion of a subject are provided.

The present invention provides method and compositions for the treatment of peripheral neuropathic pain by administering to a patient a therapeutically effective amount of a buprenorphine dimer compound, wherein the two buprenorphine portions are linked via an ethylene spacer, and wherein the spacer is bonded to the two opioid molecules via an ether bond. Preferably, the active agent is provided in the form of an injectable depot.

The present invention provides method and compositions for the treatment of peripheral neuropathic pain by administering to a patient a therapeutically effective amount of a buprenorphine dimer compound, wherein the two buprenorphine portions are linked via an ethylene spacer, and wherein the spacer is bonded to the two opioid molecules via an ether bond. Preferably, the active agent is provided in the form of an injectable depot.