Injectable codeine is available for subcutaneous or intramuscular injection only; intravenous injection is contraindicated, as this may end up in nonimmune mast-cell degranulation and ensuing anaphylactoid response. Codeine suppositories are also promoted in a few international locations. Codeine is definitely an opiate and an agonist on the mu opioid receptor https://www.codeingil.com/