The purpose of this study is to determine whether oral methadone plus acetaminophen can substitute morphine in the treatment of cancer pain.
Opioids are the mainstay of moderate-to-severe cancer pain management. Although morphine is the most commonly used, methadone has some advantages such as higher potency, lower cost and longer administration intervals. To minimize the time necessary to achieve the equianalgesic effect after a switching from morphine to methadone, acetaminophen was added in the treatment.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
SUPPORTIVE_CARE
Masking
DOUBLE
Enrollment
50
Methadone bid according to a established conversion morphine-to-methadone ratio plus Placebo or Acetaminophen qid
Disciplina de Oncologia, Faculdade de Medicina do ABC
Santo André, São Paulo, Brazil
RECRUITINGPain intensity and time to equianalgesic effect
Time frame: within the first 7 days after switching
Degree of nausea, vomiting, obstipation, xerostomia and drowsiness
Time frame: within the first 7 days of switching
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