Methylphenidate

Methylphenidate

PEP Topic 
Anxiety
Description 

Methylphenidate is a type of psychostimulant used to treat attention-deficit hyperactivity disorder and narcolepsy. Methylphenidate is closely related to amphetamine and is a schedule II drug. It is taken by mouth and available by numerous different brand names. It can be habit-forming, and individuals can develop tolerance to its effects. Methylphenidate use for patients with cancer has been evaluated in anxiety, depression, fatigue, and cognitive impairment. Methylphenidate has been evaluated alone and as part of multimodal approaches combined with other interventions such as exercise.

Effectiveness Not Established

Research Evidence Summaries

Centeno, C., Sanz, A., Cuervo, M.A., Ramos, D., Hernansanz, S., Gonzalez, J., . . . Pascual, A. (2012). Multicentre, double-blind, randomised placebo-controlled clinical trial on the efficacy of methylphenidate on depressive symptoms in advanced cancer patients. BMJ Supportive and Palliative Care, 2, 328–333.

doi: 10.1136/bmjspcare-2011-000093
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Study Purpose:

To study the efficacy of methylphenidate for relief of depressive symptoms in patients with advanced cancer.

Intervention Characteristics/Basic Study Process:

Patients who indicated some depressive symptoms from screening were randomized to receive methylphenidate ranging from 10-45 mg daily for 28 days. Doses were adjusted according to individual patient need and toxicity evaluation according to a protocol established for the study. Patient visits and evaluation occurred at days 0, 2, 7, 14, 21, and 28 either in the clinic or the patients’ homes. Patients who completed at least eight days of involvement were included in intent-to-treat analysis using the last measure carried forward.

Sample Characteristics:

  • N = 69  
  • MEDIAN AGE = 72 years (range = 40-87)
  • MALES: 58%,FEMALES: 42%
  • KEY DISEASE CHARACTERISTICS: Multiple tumor types. Average Karnofsky score range = 50-70
  • OTHER KEY SAMPLE CHARACTERISTICS: About 75% had clinically significant HADS depression scores at baseline, and slightly less than 50% had clinically relevant anxiety scores. All had a life expectance of at least one month.

Setting:

  • SITE: Multi-site  
  • SETTING TYPE: Multiple settings  
  • LOCATION: Spain

Phase of Care and Clinical Applications:

  • PHASE OF CARE: End-of-life care
  • APPLICATIONS: Palliative care 

Study Design:

  • Double blind, randomized, placebo controlled

Measurement Instruments/Methods:

  • Hospital Anxiety and Depression Scale (HADS)
  • Edmonton Symptom Assessment Scale (ESAS)

Results:

After at least one week of treatment, 54% of patients had at least a 2-point decline in depression scores, compared to 31% of those receiving placebo (p = 0.08). There were no significant differences between groups for anxiety. 71% of patients in each group had reported adverse events, and more adverse events per patient were reported by those receiving methylphenidate (p = 0.05).  Most frequent adverse events were insomnia, restlessness, confusion, and faintness.

Conclusions:

Methylphenidate administration was not significantly better than placebo for symptoms of depression or anxiety and was associated with more adverse events. The evidence regarding efficacy of methylphenidate is inconclusive.

Limitations:

  • Small sample (less than 100)
  • Other limitations/explanation: Study was underpowered

Nursing Implications:

This study sample was not large enough to enable firm conclusions from this individual study; however, findings did not show a benefit of methylphenidate and showed more adverse events that may be associated with methylphenidate. These results are not supportive for use of methylphenidate in the management of anxiety and depressive symptoms in patients with advanced cancer.

Gehring, K., Patwardhan, S. Y., Collins, R., Groves, M. D., Etzel, C. J., Meyers, C. A., & Wefel, J. S. (2012). A randomized trial on the efficacy of methylphenidate and modafinil for improving cognitive functioning and symptoms in patients with a primary brain tumor. Journal of Neuro-Oncology, 107, 165–174.

doi: 10.1007/s11060-011-0723-1
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Study Purpose:

To compare the effectiveness of immediate-release and sustained-release methylphenidate versus modafinil in improving cognitive function in patients with primary brain tumors.

Intervention Characteristics/Basic Study Process:

Patients were randomized to receive one of the following three interventions for a total of four weeks:  immediate-release methylphenidate, 10 mg twice daily; sustained-release methylphenidate, 18 mg daily; or modafinil, 200 mg daily. Neurocognitive tests were performed prior to the intervention and were repeated approximately 30 days later, after completion of the intervention.

Sample Characteristics:

  • Twenty-four patients with primary brain tumors were included.
  • Mean age was 44.98 years.
  • The sample was 54% male and 46% female.
  • Most (62.5%) of patients’ tumors were in the left hemisphere.
  • Prior treatment history included radiation therapy (83%) and chemotherapy (87.5%). Of all the participants, 62.5% received chemotherapy during the study.

Setting:

  • Single site
  • Outpatient
  • MD Anderson Cancer Center, Houston, Texas

Phase of Care and Clinical Applications:

Patients were undergoing multiple phases of care.

Study Design:

The study was a randomized, clinical trial.

Measurement Instruments/Methods:

Objective Cognitive Function Instruments

  • Wechsler Adult Intelligence Scale, third edition (WAIS-III) Digit Span and Digit Symbol subtests
  • Trail Making Test (TMT) Parts A and B
  • Hopkins Verbal Learning Test (HVLT) Immediate Recall, Delayed Recall, and Delayed Recognition Trials
  • Multilingual Aphasia Examination Controlled Oral Word Association (MAE COWA) category
  • Lafayette Instrument Grooved Pegboard Test

Subjective Anxiety Instruments

  • State-Trait Anxiety Inventory (STAI) to measure state and trait anxiety  
  • Profile of Mood States (POMS) to measure tension and anxiety

Subjective Depression Instruments

  • Beck Depression Inventory (BDI)
  • Profile of Mood States (POMS) Questionnaire, Depression-Dejection Scale

Subjective Fatigue Instruments

  • Brief Fatigue Inventory (BFI)
  • POMS questionnaire, Fatigue-Inertia Scale

Subjective Sleep-Wake Disturbance Instrument

  • Brief Sleep Disturbance Scale (BSDS)

Results:

  • Over time, no differences were found in cognitive function in regard to attention or motor function.
  • Over time, mixed results were found in regard to the speed of processing:
    • The WAIS-III Digit Symbol subtest showed significant improvement (p = 0.02), but TMT Part A did not.
    • The HVLT Delayed Recognition Trial showed a signficiant decline (p = 0.03) in memory, but the other memory-related trials did not.
  • In regard to the use of either stimulant and executive function over time, the TMT Part B score improved significantly (p = 0.02); however, the MAE COWA score declined significantly (p = 0.02).
  • In regard to differences between the methylphenidate and modafinil treatment groups over time, researchers found the following:
    • A significant difference (p = 0.05) in attention. Attention-related scores of patients taking methylphenidate were stable on the WAIS-III Digit Span subtest; the scores of patients taking modafinil worsened over time.
    • A difference in the speed of processing as measured by TMT Part A. Patients using modafinil improved in comparison to patients taking methylphenidate, whose scores either remained stable or declined slightly (p = 0.05).
  • In regard to subjective measures of other symptoms, researchers noted, with use of either stimulant over time:
    • Significant improvement (p < 0.01) of depression, as measured by the BDI and POMS Depression-Dejection Scale.
    • Significant improvement (p = 0.04) of fatigue, as measured by the BFI.
    • Significant improvement of fatigue (p < 0.01), as measured by the POMS Fatigue-Inertia Scale.
    • Significant improvement (p = 0.03) of anxiety, as measured by the state subtest of the STAI.
  • No differences were found over time in regard to sleep-wake disturbances.
  • No differences were found between treatment groups in subjective symptom measures over time.

Conclusions:

Although this study revealed some improvements in specific cognitive domains over time (e.g., executive function, speed of processing), it is unclear whether these improvements were due to the use of a stimulant; a specific medication (modafinil versus methylphenidate); or other variables, such as practice effects related to the absence of alternative neuropsychological tests. Making definitive interpretations based on this small study is difficult because the findings were confounded by the use of two stimulants (one with two different dosage schedules) and the lack of a control group (patients who were not receiving stimulants).

Limitations:

  • The study had a small sample size, with less than 30 participants.
  • The study had risks of bias due to no control group and no blinding.
  • Participant withdrawals were 10% or greater.
  • The investigators were unable to achieve the sample size recommended by the power analysis due to poor accrual and a high drop-out rate (29%). Treatment groups differed significantly in regard to age (p = 0.02) and gender (p = 0.03). Age and gender influence neuropsychological test results.

Nursing Implications:

No evidence was provided to support the use of stimulants to improve cognitive function. The study supports the conduct of future research of this topic in studies with larger sample sizes and in randomized, clinical trials with a nonintervention arm.

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