Sorbitol is a fruit-based laxative or something..it's just used for sweetening.
From
http://codeine.50g.com :
** ACUTE TOXICITY DATA **
TYPE OF TEST : TDLo - Lowest published toxic dose
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Human - woman
DOSE/DURATION : 1700 mg/kg/D
TOXIC EFFECTS :
Gastrointestinal - hypermotility, diarrhea
REFERENCE :
AJDDAL American Journal of Digestive Diseases. (New York, NY) V.5-22,
1938-55; New series: V.1-23, 1956-78. For publisher information, see
DDSCDJ. Volume(issue)/page/year: 23,568,1978
TYPE OF TEST : LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE : Oral
SPECIES OBSERVED : Rodent - rat
DOSE/DURATION : 15900 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
FAONAU FAO Nutrition Meetings Report Series. (Rome, Italy) No.?-57,
1948-77. Discontinued. Volume(issue)/page/year: 53A,498,1974