Dose-Related Distribution of Codeine, Cocaine, and Metabolites into Human Hair following Controlled Oral Codeine and Subcutaneous Cocaine Administration | Journal of Pharmacology and Experimental Therapeutics
Testicular toxicity following chronic codeine administration is via oxidative DNA damage and up-regulation of NO/TNF-α and caspase 3 activities | PLOS ONE
PDF] Evaluation of dosing guidelines for use of controlled-release codeine in chronic noncancer pain. | Semantic Scholar
Pediatric Codeine Prescriptions in Outpatient and Inpatient Settings in Korea
Distribution of controlled-release codeine doses | Download Table
Weekly Dose: codeine doesn't work for some people, and works too well for others