Dexamphetamine (dextroamphetamine) is a psychostimulant that causes pronounced stimulation of the cerebral cortex and respiratory and vasomotor centers, increasing motor activity, mental alertness, wakefulness, and euphoria. Dexamphetamine has been evaluated for fatigue.
Minton, O., Richardson, A., Sharpe, M., Hotopf, M., & Stone, P. (2010). Drug therapy for the management of cancer-related fatigue. Cochrane Database of Systematic Reviews, 7, CD006704.
To evaluate the effectiveness of pharmacologic interventions used for fatigue in patients with cancer
Databases searched were PaPaS, Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, EMBASE, CINAHL, Dissertation Abstracts International (DAI), metaRegister of Controlled Trials (mRCT) (January 2007–October 2009). Journals searched were British Journal of Cancer, Journal of Clinical Oncology, Journal of Pain and Symptom Management, and Journal of Palliative Medicine. The reference lists of all articles were checked for additional studies. Conference abstracts also were searched.
Search keywords were neoplasms, bone marrow transplantation, cancer, carcinoma, tumour, adenocarcinoma, leukemia, lymphoma, malignant, radiotherapy, fatigue, tired, weary, weariness, exhausted, lack or loss or lost energy or vigor, apathy or lassitude or lethargy, or feeling drained, sleepy, or sluggish.
Studies were included in the review if they
This review was an update of a previous review. The updated search retrieved 647 additional references. Of those, six additional studies met the inclusion criteria. The final sample of studies included was 31.
The review included 7,104 participants who received a drug intervention for CRF.
Psychostimulants
Erythropoietin and Darbepoetin
Antidepressants/Paroxetine
Progestational Steroids
Four trials of methylphenidate provided evidence for use that was supportive but associated with a small effect size in a dose of 10–20 mg per day. Serious adverse events were minimal; however, clinicians need to review contraindications before prescribing. Additional large-scale trials were suggested using methylphenidate to further evaluate use in CRF. Erythropoietin and darbepoetin can no longer be recommended for CRF because of increased adverse events associated with these drugs. No current evidence exists to support the use of steroids.
Peuckmann, V., Elsner, F., Krumm, N., Trottenberg, P., & Radbruch, L. (2010). Pharmacological treatments for fatigue associated with palliative care. Cochrane Database of Systematic Reviews, 11, CD006788.
To determine the efficacy of pharmacological treatment on nonspecific fatigue in palliative care, including patients with advanced cancer and other chronic conditions associated with fatigue.
Databases searched were EMBASE, PsychLit, CENTRAL, and MEDLINE. Reference lists of identified articles were reviewed for inclusion, and textbooks were handsearched. Conference proceedings of the American Society of Clinical Oncology (ASCO) from 2000 to 2008 and the 2005 meeting of the European Cancer Conference were included in the search.
An extensive listing of keywords and specific search methods per database are provided in the article.
Studies were included in the review if
Studies were excluded if they studied megestrol or focused on physiologic deficiencies, such as lack of hemoglobin and use of erythropoietin.
Initial searching provided 2,000 titles. Of those, 22 met the inclusion criteria. They included data from 11 drugs: amantadine (6), pemoline (3), methylphenidate (3), dexamphetamine (2), paroxetine (2), acetyl-L-carnitine (2), testosterone (2), fluoxetine (1), donepezil (1), modafinil (1), and acetylsalicylic acid (1). If two or more studies of the same medication could be analyzed in the same subpopulation of patients, meta-analysis was performed. Meta-analysis was performed for amantadine, pemoline, methylphenidate, and modafinil.
Most studies showed some beneficial effect; however, a substantial similar placebo effect was often observed.
Amantadine
Pemoline
Methylphenidate
Dextroamphetamine
Paroxetine
Testosterone
Acetyl-L-carnitine
Modafinil
Donepezil
Other
Methylphenidate and amantadine showed promise for reducing fatigue in patients with advanced disease. Amantadine has not been studied in patients with cancer-related fatigue, but it has been shown to be effective in patients with MS. The meta-analysis included only a few studies and the evidence was weak, pointing to the need for additional research in this area. It is not clear whether amantadine would be useful for patients with cancer, as this has not been studied.
The analysis was performed only in palliative care populations and did not include studies of methylphenidate in patients with cancer during active treatment, which also have shown some efficacy. However, side effects included insomnia, anorexia, behavior change, and vertigo in studies reviewed with methylphenidate. In addition, although statistically significant, effect sizes were small. These findings suggest that use in patients with cancer, who also may experience anorexia and sleep disorders from other causes, has potential benefits that would need to be balanced with potential adverse effects. Carnitine, acetylsalicylic acid, and modafinil have been used in a few studies with positive results. These drugs warrant additional investigation to confirm efficacy in different patient populations with fatigue.
Auret, K. A., Schug, S. A., Bremner, A. P., & Bulsara, M. (2009). A randomized, double-blind, placebo-controlled trial assessing the impact of dexamphetamine on fatigue in patients with advanced cancer. Journal of Pain and Symptom Management, 37, 613–621.
To test the hypothesis that use of dexamphetamine in fatigued patients with advanced cancer would produce a clinically significant improvement with minimal side effects.
Patients with a prognosis of more than two months and fatigue rated at least 4 out of 10 were randomized to receive either dexamphetamine or lactose placebo. Patients were given a daily dose of 20 mg in two doses daily at 8 am and noon. Patients were contacted daily by telephone if at home to record acceptability and improve compliance. If the dose was not tolerated, it was reduced by 50%. The trial was conducted for eight days, and measurement was repeated every two days.
Single multisite study in a palliatve care service in Australia
The study was a randomized, double-blind, placebo-controlled trial.
A transient improvement was observed in fatigue in the dexamphetamine arm (p = 0.039) only on day 2 of the trial. No other significant differences existed between groups. Age and sex were significant predictors of severity of fatigue; those who were younger (p = 0.03) and male (p = 0.047) had more severe fatigue. Both groups had nonsignificant improvement in quality of life measures on some subscales, indicating a potential overall placebo effect. Medication was associated with an increased pulse rate, suggesting that the dosage given had a physiologic effect.
Although well tolerated, 20 mg of dexamphetamine does not improve fatigue or quality of life in patients with advanced cancer. This study agreed with null effects reported by others. Short-term results seen may indicate a response to initiation of a psychostimulant, and changing the dosage over time may have more effect.
Optimum dosage across studies has not been defined.