Injectable codeine is readily available for subcutaneous or intramuscular injection only; intravenous injection is contraindicated, as this can lead to nonimmune mast-cell degranulation and resulting anaphylactoid reaction. Codeine suppositories may also be marketed in some nations. Codeine is really an opiate and an agonist with the mu opioid receptor (MOR). https://www.codeingil.com/