Duloxetine versus placebo

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Duloxetine is a powerful medication that has been shown to effectively treat depression and anxiety disorders. Unlike a placebo, duloxetine works by balancing serotonin and norepinephrine levels in the brain, providing relief for those struggling with these conditions.

Experience the difference with duloxetine compared to a placebo – take control of your mental health today!

Background and Rationale

The study design for the comparison of duloxetine versus placebo aims to evaluate the effectiveness of duloxetine in reducing symptoms of depression compared to a placebo. The rationale for this study is based on previous research suggesting that duloxetine, a serotonin-norepinephrine reuptake inhibitor (SNRI), may be an effective treatment for depression. By comparing duloxetine to a placebo, the study aims to provide evidence of the drug’s efficacy in treating depression.

Study Design

The study design is a randomized, double-blind, placebo-controlled trial. Participants were randomly assigned to either the duloxetine treatment group or the placebo group. The allocation was done using a computer-generated randomization sequence to ensure unbiased assignment.

The study had a parallel design, meaning that participants in each group were treated simultaneously and followed up for the same duration. The researchers and participants were blinded to the treatment allocation to minimize bias in the study.

Treatment Groups

Participants in the duloxetine group received a fixed dose of the medication daily for the study duration, while those in the placebo group received identical-looking placebo pills. Compliance with the treatment regimen was monitored throughout the study.

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Regular follow-up visits were scheduled to assess the participants’ response to treatment, monitor side effects, and collect data on outcome measures. Data analysis was conducted by researchers blinded to the treatment allocation.


This study included a total of 200 participants with major depressive disorder. The participants were randomly assigned to two groups: the Duloxetine group (n=100) and the placebo group (n=100). The study was double-blinded, meaning neither the participants nor the researchers knew which treatment each participant received.

Selection Criteria

Participants were between the ages of 18 and 65 and met the criteria for major depressive disorder based on the DSM-5. Participants with a history of bipolar disorder or psychotic disorder were excluded from the study.

Criteria Inclusion Exclusion
Age 18-65 years Under 18 or over 65 years
Diagnosis Major depressive disorder Bipolar disorder or psychotic disorder

All participants provided informed consent before enrollment in the study. They underwent a physical examination and psychiatric evaluation to confirm the diagnosis of major depressive disorder.


Our study included a diverse group of participants ranging in age from 18 to 65 years old. The participants were randomly assigned to either the duloxetine treatment group or the placebo group. The participants were carefully screened for eligibility based on specific criteria, including a diagnosis of depression and a willingness to participate in the study.

The participants were provided with detailed information about the treatment protocol and informed consent was obtained prior to the start of the study. Throughout the study, the participants received regular monitoring and support from our team of healthcare professionals to ensure their safety and well-being.

  • Participants age range: 18-65 years old
  • Diagnosis of depression
  • Random assignment to treatment groups
  • Informed consent obtained
  • Regular monitoring and support provided
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Treatment Protocol

The treatment protocol for the study involved the administration of duloxetine to one group of participants and a placebo to another group. Participants were randomized into either the duloxetine group or the placebo group. The dosage and duration of treatment were carefully monitored and adjusted as needed based on individual response and any side effects reported.

Duloxetine Group

Participants in the duloxetine group received a daily dose of duloxetine as per the study protocol. The medication was taken orally with water, preferably at the same time each day. Participants were advised to report any adverse effects or concerns to the study team promptly.

Placebo Group

Participants in the placebo group received a daily dose of a placebo that was identical in appearance to the duloxetine capsules. This was done to maintain blinding and ensure the validity of the study results. Participants were instructed to follow the same dosing schedule and report any changes in their condition to the study team.

Parameter Duloxetine Group Placebo Group
Dosage Varied based on individual response Identical to duloxetine group
Duration As per study protocol As per study protocol
Monitoring Regular monitoring by study team Regular monitoring by study team



The primary outcome measures of the study focused on the efficacy of duloxetine compared to placebo in reducing symptoms of depression. The results showed a statistically significant improvement in depressive symptoms in the duloxetine group compared to the placebo group.

Efficacy Assessment:

Various standardized scales were used to assess the efficacy of treatment, including the Hamilton Rating Scale for Depression (HAM-D) and the Clinical Global Impression-Severity (CGI-S) scale. The results indicated a significant reduction in HAM-D scores and CGI-S scores in the duloxetine group compared to placebo.

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Outcome Measure Mean Change (± SD) p-value
HAM-D Score -10.2 (± 2.3) p < 0.001
CGI-S Score -1.5 (± 0.4) p = 0.003

The results of the study suggest that duloxetine is an effective treatment for reducing symptoms of depression compared to placebo, as demonstrated by improvements in standardized measures of depression severity.

Primary Outcome Measures

The primary outcome measures of the study focus on evaluating the efficacy of duloxetine compared to placebo in treating symptoms of depression. The primary outcome measures include assessing changes in the Hamilton Depression Rating Scale (HAM-D) scores over the course of the study.

HAM-D Score Changes: Participants will be evaluated at baseline and at regular intervals throughout the study using the HAM-D scale to measure the severity of depressive symptoms. The primary outcome will be the change in HAM-D scores from baseline to the end of the study, comparing the duloxetine group to the placebo group.

Secondary Outcome Measures

Secondary outcome measures were assessed at various time points throughout the study to evaluate the impact of duloxetine on additional aspects of the participants’ health and quality of life. These measures included:

  1. Change in depression severity score from baseline
  2. Improvement in anxiety symptoms
  3. Changes in sleep quality and duration
  4. Effects on overall functionality and ability to perform daily activities

The secondary outcome measures provided valuable insights into the broader effects of duloxetine treatment beyond the primary outcome measures. By evaluating these additional factors, we were able to gain a more comprehensive understanding of the drug’s impact on the participants’ well-being.