De StoutzNDBrueraE. Opioid rotation for toxicity reduction in terminal cancer patients. J Pain Symptom Manage1995; 10(5): 378–384.
2.
PerieiraJPLawlerP. Equianalgesic dose ratios for opioids: a critical review and proposals for long term dosing. J Pain Symptom Manage2001; 22(2): 672–687.
3.
British national formulary61 (March2011). London: The BMJ Group and the Pharmaceutical Press, pp. 20–24.
4.
TwycrossRWilcoxA (eds) Palliative care formulary. 3rd ed.Nottingham: Palliativedrugs.com.Ltd, 2007, pp. 309, 465–471.
5.
DickmanASchneiderJVargaJ. The syringe driver: continuous subcutaneous infusions in palliative care. 2nd ed.Oxford: Oxford University Press, 2005, pp. 29–31.
6.
ShugSGandhamN. Opioids: clinical use. In: McMahonSBKoltzenburgM (eds) Textbook of pain. 5th ed.China: Elsevier Churchill Livingstone, 2006, p. 453.
7.
OxberrySGSimpsonKH. Pharmacotherapy for cancer pain. CEACCP2005; 5(6): 203–206.
8.
NatuschDMagidesA. Opioid potency converter. In: Pain news, The British Pain Society newsletter9, Spring2005.
9.
LipkowskiAWCarrD. Rethinking opioid equivalence. In: Pain clinical updates, Vol. X(4). Seattle: International Association for the Study of Pain Press, 2002.
10.
MehtaVLangfordR. Acute pain management in opioid dependent patients. Reviews in Pain2009; 3(2): 10–14.
11.
SimonnetG. Opioids: from analgesia to anti-hyperalgesia?Pain2005; 118: 8–9.
12.
FinnisDGNicholasMKBenedettiF. Placebo analgesia – understanding the mechanisms and implications for clinical practice. Reviews in Pain2009; 3(2): 15–19.
13.
FieldsHL. Should we be reluctant to prescribe opioids for chronic non-malignant pain?Pain2007; 129: 233–234.