Paroxetine is a selective serotonin-reuptake inhibitor (SSRI) type of antidepressant. Paroxetine tablets, suspension, and extended-release tablets are used to treat depression, panic disorder, and social anxiety disorder. Paroxetine tablets and suspension also are used to treat obsessive-compulsive disorder, generalized anxiety disorder, and post-traumatic stress disorder. SSRIs and antidepressants in general have been evaluated for use in treating pain and peripheral neuropathy. Paroxetine specifically has been studied in patients with cancer for hot flashes, sleep-wake disturbances, and fatigue.
Paroxetine is an SSRI antidepressant that is a strong inhibitor of the CYP2D6 enzyme system that acts to metabolize tamoxifen to its active form, endoxifen. A retrospective study of women with breast cancer taking tamoxifen and paroxetine showed a significantly increased risk of death from breast cancer with overlapping use of both agents. Caution is recommended in the use of paroxetine for women experiencing tamoxifen-induced hot flashes.
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.
Capuron, L., Gumnick, J. F., Musselman, D. L., Lawson, D. H., Reemsnyder, A., Nemeroff, C. B., . . . Miller, A. H. (2002). Neurobehavioral effects of interferon-alpha in cancer patients: phenomenology and paroxetine responsiveness of symptom dimensions. Neuropsychopharmacology, 26, 643–652.
Patients were given oral paroxetine/placebo 10 mg for one week pre-interferon treatment, paroxetine/placebo 20 mg during the first week of interferon treatment, and then paroxetine/placebo 20 to 40 mg for all subsequent weeks of interferon therapy. Total length of treatment with paroxetine was 12 weeks. The study was based on the hypothesis that, as a selective serotonin reuptake inhibitor (SSRI), paroxetine may improve the neuropsychiatric and neurovegetative symptoms associated with interferon-alpha treatment.
Patients were undergoing the active treatment phase of care.
The study was a randomized, double-blind, placebo-controlled trial.
Neurotoxicity Rating Scale (NRS) was used to measure various depressive symptoms, cognitive disturbances, and vegetative symptoms, including fatigue.
When compared with the control group, pretreatment with paroxetine was effective in preventing interferon-induced mood and cognitive symptoms, as well improving pain. Paroxetine had less effect on the development of interferon-alpha–related neurovegetative symptoms, including fatigue, as measured by the NRS. Fatigue and somatic symptoms increased in both depressed and nondepressed patients.
Across the twelve weeks of the study, seven patients from the placebo group and one patient from the paroxetine group withdrew due to severe depression or neurotoxicity.
No special training is required. There are costs related to drug acquisition.
Morrow, G. R., Hickok, J. T., Roscoe, J. A., Raubertas, R. F., Andrews, P. L., Flynn, P. J., . . . University of Rochester Cancer Center Community Clinical Oncology Program. (2003). Differential effects of paroxetine on fatigue and depression: a randomized, double-blind trial from the University of Rochester Cancer Center Community Clinical Oncology Program. Journal of Clinical Oncology, 21, 4635–4641
Patients were given oral paroxetine 20 mg orally daily or placebo for eight weeks.
18 Community Clinical Oncology Program (CCOP) outpatient centers
Patients were undergoing the active treatment phase of care.
The study was a randomized, double-blind, placebo-controlled trial.
The paroxetine group and the placebo control had comparable levels of fatigue and depression at study inception. Paroxetine had neither beneficial nor detrimental effects on fatigue. There was a significantly lower mean level of depression in the paroxetine group compared with the placebo group. Treatment with paroxetine also favorably affected patients’ general moods. There were no differences in the effect of paroxetine on fatigue by gender, age, indication for treatment (adjuvant treatment versus treatment for metastatic disease), or by whether patients were more or less fatigued at baseline.
No special training is required to deliver the intervention. There are costs related to drug acquisition.
Roscoe, J. A., Morrow, G. R., Hickok, J. T., Mustian, K. M., Griggs, J. J., Matteson, S. E., . . . Smith, B. (2005). Effect of paroxetine hydrochloride (Paxil) on fatigue and depression in breast cancer patients receiving chemotherapy. Breast Cancer Research and Treatment, 89, 243–249.
Patients were given oral paroxetine 20 mg daily beginning seven days after the initiation of the first cycle of chemotherapy for newly diagnosed breast cancer and continued until seven days following their fourth cycle of chemotherapy or placebo. Randomization was stratified by type of chemotherapy regimen to achieve a balanced design.
Patients were recruited from a university medical center and two of its affiliated hospitals.
Patients were undergoing the active treatment phase of care.
The study was a multicenter, randomized, double-blind, placebo-controlled trial.
Controlling for baseline fatigue scores, there were no statistically significant differences in fatigue or fatigue interference between the treatment and control groups. There was no relationship between anemia and fatigue at baseline, although changes in anemia over the course of the study were modestly but significantly correlated with one measure of fatigue.
There were costs related to drug acquisition.