The current study investigated the pharmacokinetic profile of a newly developed biodegradable subcutaneous tramadol implant and shed some light on neurochemical changes. Ribbons of polycaprolactone polymer were loaded with tramadol HCl in two quantities (T350, T650) and implanted in back skin of rats. Plasma tramadol levels were monitored for 45 days and pharmacokinetic parameters were evaluated i...