Safety of Discontinuing Patient Antibiotic Treatment

Study Overview
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Brief Summary
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There is no evidence that discontinuing antibiotic therapy for non-bacterial infections is safe. The main objective of this study is to determine whether discontinuation of antibiotic therapy when a clinician no longer considers it necessary makes any difference in terms of the number of days with severe symptoms. This is a multicentre, open-label, randomised controlled clinical trial. The study will be conducted in ten primary care centres in Spain. We will include patients from 18 to 75 years of age with uncomplicated acute respiratory tract infections (RTIs) in whom: antibiotics are not necessary; or those diagnosed with clinical conditions for which antibiotics might be necessary but according to the history and clinical examination the physician considers that antibiotics are not needed or the patient feels that the antibiotic regimen has not worked as expected; or several doses of an antibiotic have been taken from leftovers found in the household or obtained at the pharmacy without any medical prescription for a clinical condition for which antibiotics are not necessary. The patients will be randomly assigned to the usual strategy of continuing antibiotic treatment (usual intervention group) or discontinuing antibiotic therapy (novel intervention group). A sample size of 215 patients per group was calculated on the basis of a reduction of one day in the duration of severe symptoms as a clinically relevant outcome. The primary outcome will be duration of severe symptoms, i.e. symptoms scored 5 or 6 by means of a symptom diary. Secondary outcomes will include: antibiotics taken, adverse events, patient satisfaction, and complications within the first 3 months.

Detailed Description
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Introduction: General practitioners (GP) have always been told to continue an antibiotic regimen once the patient has initiated it in order to prevent the patient from acquiring resistant microorganisms. This might be true for confirmed bacterial infections; however, continuing an antibiotic regimen when this is not indicated might hasten the acquisition of resistant organisms and cause adverse events. Since 2011 the Spanish Society of Family Medicine has been recommending GPs to ask their patients to stop taking antibiotics when they suspect a viral infection. However, there is no evidence that discontinuing antibiotic therapy for these conditions is safe. The main objective of this study is to determine whether discontinuation of antibiotic therapy when a GP no longer considers it necessary makes any difference in terms of the number of days with severe symptoms. Methods: This is a multicentre, open-label, randomised controlled clinical trial. The study will be conducted in ten primary care centres in Spain. We will include patients from 18 to 75 years of age with uncomplicated acute respiratory tract infections (RTIs) in whom: 1. Antibiotics are not necessary; or 2. Those diagnosed with clinical conditions for which antibiotics might be necessary but according to the history and clinical examination the GP considers that antibiotics are not needed or the patient feels that the antibiotic regimen has not worked as expected; or 3. Several doses of an antibiotic have been taken from leftovers found in the household or obtained at the pharmacy without any medical prescription for a clinical condition for which antibiotics are not necessary. The patients will be randomly assigned to the usual strategy of continuing antibiotic treatment (usual intervention group) or discontinuing antibiotic therapy (novel intervention group). A sample size of 215 patients per group was calculated on the basis of a reduction of one day in the duration of severe symptoms as a clinically relevant outcome. The primary outcome will be duration of severe symptoms, i.e. symptoms scored 5 or 6 by means of a symptom diary. Secondary outcomes will include: antibiotics taken, adverse events, patient satisfaction, and complications within the first 3 months. A post-trial implementation observational clinical study by means of a qualitative analysis is planned to be carried out after the clinical trial to know the percentage of the use of the strategy of discontinuing antibiotic treatment and the pros and cons of its use. Ethics and dissemination: The study was approved by the Ethical Board of Fundació Jordi Gol i Gurina (reference number: 16/093) and informed consent will be obtained from all the patients included. The findings of this trial will be disseminated through research conferences and peer-reviewed journals.

Official Title
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Safety of Discontinuing Patient Antibiotic Treatment When Physicians no Longer Consider it Necessary

Conditions
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Infectious Diseases, Respiratory Tract Infections

Intervention / Treatment
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* Other: Discontinuing antibiotic therapy
* Other: Continuing antibiotic therapy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with uncomplicated respiratory tract infections [common cold, influenza, pharyngitis, rhinosinusitis, acute bronchitis, and acute exacerbations of mild-to-moderate chronic obstructive pulmonary disease] who has previously taken any dose of antibiotic due to any of the following 3 clinical scenarios and accepts to participate in the clinical trial will be included: Patients diagnosed with clinical conditions for which antibiotics are not necessary; Patients diagnosed with a clinical condition for which antibiotics might be necessary but according to the history and clinical examination the primary health physician considers that antibiotics are not needed to be taken or the patients feel that the antibiotic regimen has not worked as expected and feel they need clinical reassessment Patients who have taken some doses of an antibiotic (from leftovers found in the household or obtained at the pharmacy without any medical prescription) for a clinical condition for which antibiotics are not necessary Exclusion Criteria: Subjects under 18 and over 75 years of age Patients with confirmed bacterial infection Patients requiring hospital admission Severe impairment of signs (impairment of consciousness, respiratory rate > 30 respirations per minute, heart rate > 125 beats per minute, systolic blood pressure < 90 mm Hg, diastolic blood pressure < 60 mm Hg, temperature > 40°C, oxygen saturation < 92%) Problems to comply with treatment at home - sociopathy or psychiatric problems, drug or alcohol addiction, or within an inadequate family setting - Lack of tolerance to oral treatment, such as the presence of nausea and vomiting, gastrectomy, post-surgery and/or diarrhoea Significant comorbidity, including severe renal failure, hepatic cirrhosis, severe heart failure, immunosuppression - chronic HIV infection, transplantation, neutropenic, or patients receiving immunosuppressive drugs or corticosteroids - Terminal disease Admitted to a long-term residence Difficulty to attend the programmed visits Refusal to participate in the study

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Novel intervention group<br>Discontinuing antibiotic therapy. | Other: Discontinuing antibiotic therapy<br>* Patients assigned to this group will be asked to discontinue antibiotic therapy.<br>|
| Experimental: Usual intervention group<br>Usual strategy of continuing antibiotic treatment. | Other: Continuing antibiotic therapy<br>* Patients assigned to this group will be asked to complete antibiotic therapy.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Duration of severe symptoms | Days with symptoms scoring 5 or 6 by means of a six-point Likert scale | From 14 to 28 days after the index visit | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Adverse effects of the medication | Any adverse effect appearing from day 0 to 28 | From index visit to 28 days after the initial visit | 
| Antibiotic consumption | Any antibiotic taken by the patient | From index visit to day 28 | 
| Satisfaction with health care by means of a questionnaire | Satisfaction degree stated by the patient at day 28 | Day 28 after the index visit | 
| Belief in the effectiveness of antibiotic therapy by means of a questionnaire | Degree of patient's belief in how effective antibiotics are for uncomplicated respiratory tract infections | Day 28 after the index visit | 
| Rate of complications | Any complication related to the uncomplicated respiratory tract infection within the 3 first months after the index visit | Within the first 3 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Anti-Bacterial Agents, Primary Health Care, Drug Resistance, Microbial, Respiratory Tract Infections