Took 2, 30 mg morphine pills in a day. Now she is experiencing side effects like decreased urination and itching. How long will these last?

See below . The therapeutic pain-relieving and euphoric effects of oral morphine generally last about 4-6 hrs. Itching and depressed bladder function are not uncommon side effects of narcotics and opiates and may last noticeably longer with considerable individual variation. 90% of the drug is excreted .