Dickerson ED: 20 essential drugs in palliative care. European Journal of Palliative Care. 1999; 6(4): 130-135.
2.
Twycross R: Symptom Management in Advanced Cancer, 2nd Ed.Oxford: Radcliffe Medical Press, 1997: 36.
3.
Cherny NI, Portenoy RK: The management of cancer pain. Cancer Journal for Clinicians. 1994; 44: 262-303.
4.
Twycross R: Introducing Palliative Care, 3rd Ed.Oxford: Radcliffe Medical Press, 1999: 86.
5.
Ripamonti C, Groff L, Brunelli C, et al.: Switching from morphine to oral methadone in treating cancer pain: What is the equianalgesic dose ratio?Journal of Clinical Oncology. 1998; 16(10): 3216-3221.
6.
Crews JC, Sweeny NJ, Denson DD: Clinical efficacy of methadone in patients refractory to other β-opioid receptor agonist analgesics for management of terminal cancer pain. Cancer. 1993; 72: 2266-2272.
7.
American Pain Society: Principles of Analgesic Use in the Treatment of Acute Pain and Cancer Pain, 4th Ed.Glenville IL: American Pain Society, 1999: 14.
8.
Reisine T, Pasternak G: Opioid analgesics and antagonists. In Hardman JG, Limbird LE, et al. (eds.): Goodman & Gilman’s The Pharmacological Basis of Therapeutics, 9th Ed.New York: McGraw Hill, 1996: 521-556.
9.
United States Department of Health and Human Services: Clinical Practice Guideline, Number 9: Management of Cancer Pain. Washington, DC: Agency for Health Care Policy and Research, 1994: 54.
10.
Ashburn MA, Lipman AG: Management of pain in the cancer patient. Anesth Analg. 1993; 76: 402-416.
11.
Morley JS, Makin MK: The use of methadone in cancer pain poorly responsive to other opioids. Pain Reviews. 1998; 5: 51-58.
12.
Bruera E, Pereira J, Watanabe S, et al.: Opioid rotation in patients with cancer pain. A retrospective comparison of dose ratios between methadone, hydromorphone and morphine. Cancer. 1996; 78: 852-857.
13.
Ripamonti C, Dickerson ED: Gli oppioidi analgesici. In Mercadante S, Ripamonti C, (eds.): Valutazione, diagnosi e trattamento del dolore da cancro [Italian]. Milan: Masson SpA, 2000: 69-91.
14.
Mercadante S, Casuccio A, Agnello A, et al.: Morphine versus methadone in the pain treatment of advanced-cancer patients followed up at home. Journal of Clinical Oncology. 1998; 16(11): 3656-3661.