Spiramycin, a macrolide antibiotic, has been studied in the United States for the treatment of cryptosporidial diarrhea. Some reports suggest that spiramycin is useful in improving the symptoms of cryptosporidial diarrhea in some patients. It has been used in Europe and Canada for over 20 years to treat bacterial infections. Serious adverse effects from spiramycin are apparently rare, and no drug-associated deaths have been reported. Spiramycin inhibits translocation by binding to bacterial 50S ribosomal subunits with an apparent 1:1 stoichiometry. This antibiotic is a potent inhibitor of the binding to the ribosome of both donor and acceptor substrates. Spiramycin induces rapid breakdown of polyribosomes, an effect which has formerly been interpreted as occurring by normal ribosomal run-off followed by an antibiotic-induced block at or shortly after initiation of a new peptide. However, there is now convincing evidence that spiramycin, and probably all macrolides, act primarily by stimulating the dissociation of peptidyl-tRNA from ribosomes during translocation

Human secretin is a gastrointestinal peptide hormone that regulates secretions in the stomach, pancreas, and liver. Synthetic human secretin displays equivalent biological activity and properties as naturally occurring secretin. Acetate salt of synthetic secretin was marketed under the name ChiRhoStim. ChiRhoStim is indicated for the stimulation of pancreatic secretions, including bicarbonate, to aid in the diagnosis of pancreatic exocrine dysfunction, for the gastrin secretion to aid in the diagnosis of gastrinoma. ChiRhoStim is also used for the pancreatic secretions to facilitate the identification of the ampulla of Vater and accessory papilla during endoscopic, retrograde cholangiopancreatography (ERCP). When secretin binds to secretin receptors on pancreatic duct cells it opens cystic fibrosis transmembrane conductance regulator (CFTR) channels, leading to secretion of bicarbonate-rich-pancreatic fluid.

Ziconotide (PRIALT; SNX-111) is a neuroactive peptide, which was approved by FDA in 2004 for the management of severe chronic pain in adult patients for whom intrathecal therapy is warranted, and who are intolerant of or refractory to other treatment, such as systemic analgesics, adjunctive therapies, or intrathecal morphine. Ziconotide acts as a selective N-type voltage-gated calcium channel blocker, which leads to a blockade of excitatory neurotransmitter release from the primary afferent nerve terminals.

There is no available information related any biological and pharmaceutical application of ammonium tetrachlorozincate.

Eledoisin is an endecapeptide tachykinin receptor ligand. Originally it was isolated from salivary glands of Mediterranean octopod, Eledone moschata. Eledoisin is a powerful vasodilator and hypotensive agent in most animal species.