( 100 mg kg-1 ) and rectal ( unrestricted or restricted to 1.5 cm from the anus , 10 mg kg-1 ) administration of morphine hydrochloride were determined in 10 or 11-week-old male wistar rats to compare bioavailability of morphine after the rectal dosage with that after oral administration .
C0770901
morphine
C0026549
morphine