Side effect: nausea, vomiting - Tramadol injection (7%), Morphin oral (40%), Morphin subcutaneous injection (37.3%), Morphin continuous subcutaneous infusion (39.1%), Fentanyl patch (13.4%).
Tác dụng phụ: buồn nôn, nôn ở Tramadol tiêm (7%), Morphin uống (40%), Morphin TDD (37,3%), Morphin truyền DDLT (39,1%), Fentanyl dán (13,4%).