Predictors of antibiotics co-prescription with antimalarials for patients presenting with fever in rural Tanzania
© Njozi et al.; licensee BioMed Central Ltd. 2013
Received: 30 January 2013
Accepted: 20 November 2013
Published: 27 November 2013
Successful implementation of malaria treatment policy depends on the prescription practices for patients with malaria. This paper describes prescription patterns and assesses factors associated with co-prescription of antibiotics and artemether-lumefantrine (AL) for patients presenting with fever in rural Tanzania.
From June 2009 to September 2011, a cohort event monitoring program was conducted among all patients treated at 8 selected health facilities in Ifakara and Rufiji Health and Demographic Surveillance System (HDSS). It included all patients presenting with fever and prescribed with AL. Logistic regression was used to model the predictors on the outcome variable which is co-prescription of AL and antibiotics on a single clinical visit.
A cohort of 11,648 was recruited and followed up with 92% presenting with fever. Presumptive treatment was used in 56% of patients treated with AL. On average 2.4 (1 – 7) drugs was prescribed per encounter, indicating co-prescription of AL with other drugs. Children under five had higher odds of AL and antibiotics co-prescription (OR = 0.63, 95% CI: 0.46 – 0.85) than those aged more than five years. Patients testing negative had higher odds (OR = 2.22, 95% CI: 1.65 – 2.97) of AL and antibiotics co-prescription. Patients receiving treatment from dispensaries had higher odds (OR = 1.45, 95% CI: 0.84 – 2.30) of AL and antibiotics co-prescription than those served in health centres even though the deference was not statistically significant.
Regardless the fact that Malaria is declining but due to lack of laboratories and mRDT in most health facilities in the rural areas, clinicians are still treating malaria presumptively. This leads them to prescribe more drugs to treat all possibilities.
KeywordsCohort event monitoring Antibiotics Co-prescription Artemether-lumefantrine Tanzania
Malaria remains a public health problem in Africa. It is estimated to claim about 1 million deaths and over 400 million malaria cases worldwide each year, with 90% of these deaths occurring in sub Saharan Africa . In Tanzania malaria has been reported as the leading cause of death and account for 40% of all outpatient attendances in health facilities . Assessment of clinical symptoms is the common method of diagnosing patient’s conditions in the country, with most cases of fever being presumed to be malaria. Few health facilities are equipped with basic laboratory services or use rapid diagnostic test to provide confirmatory diagnoses of malaria; that has resulted into misdiagnosis or over diagnosis of malaria. A study conducted in Muhimbili National hospital showed 87% of patients who received antimalarial treatment with a diagnosis of severe malaria did not have detectable parasitemia, resulting in over-treatment of malaria and neglecting other potentially life threatening conditions .
Fever has been used as a major clinical symptom for malaria , Now reports show that malaria has been declining , while fever remains a major complaint in many outpatients clinical settings . This high prevalence of fever may still be presumed as malaria, hence a need to strengthen confirmation of malaria in order to target use of antimalarial drugs to confirmed cases only. The Tanzania National Guideline for diagnosis and treatment of malaria states that, “a careful assessment of a patient with suspected malaria is essential in order to differentiate between uncomplicated and severe disease. Eventually, laboratory investigations are done to complement clinical diagnosis. In health care facilities without laboratory services, diagnosis is based only on signs and symptoms” . Malaria treatment in Tanzania is mainly based on clinical judgment in the majority of health facilities, especially lower level facilities. Most of the health facilities lack laboratory diagnostic capacity for malaria and hence most of the reported malaria cases are clinically diagnosed. According to NMCP, up to early 2009, 83% of health facilities in Tanzania had no laboratory diagnostic capacity for malaria. In addition, there is a problem of inaccurate malaria microscopic diagnosis and hence misdiagnosis of patients and over use of ACT .
Microscopic examination of Giemsa-stained blood films remains a cornerstone of malaria diagnosis throughout Tanzania, but is only available at hospitals and some health centers. Historically, more than 5,000 of the lowest-level facilities (dispensaries and some health centers) had no laboratory diagnostic capacity, leaving health care workers at more than 90% of facilities to diagnose malaria on the basis of clinical signs and symptoms alone. According to the recent WHO guidelines, all suspected malaria cases should be parasitological confirmed prior to treatment, including children under five. NMCP’s policy has changed from presumptive treatment to confirmatory parasitological diagnosis. The NMCP objective is to increase the percentage of laboratory-confirmed malaria cases in public health facilities from a baseline of 20% to 80%. It is clear from numerous assessments that the quality of malaria microscopy is very poor at almost all levels of the health system. Phased rollout of RDTs began in April 2009, starting in areas of low/moderate transmission and expanded to areas of stable/high transmission. Currently, laboratory confirmation is happening in only 20% of the suspected cases and there is no system for laboratory quality assurance and quality control [8–11]. Over-diagnosis of malaria can lead to inappropriate management of other causes of fever, unnecessarily usage of antimalarials, increasing the burden of malaria treatment cost, drug resistance and unsafe treatment, or prolongation of illness and death [12–15]. Antibiotic resistance is increasingly becoming a public health problem . Improvement in antibiotics prescription will reduce chances of bacterial resistance and minimize hospital costs. In hospitals, currently the costs for antibiotics accounts for more than 30% of hospital budgets, and about one third to a half of all hospitalized patients receive an antibiotic . It is necessary, therefore, to define and assess the prescription patterns in order to address the problem of irrational prescribing habits, and understand types of drugs commonly co-prescribed with antimalarials [15, 16]. The World Health Organization (WHO) discourages the use of large number of drugs per encounter and irrational co-prescription of drugs with Artemisinin based Combination Therapy (ACT) . The assessment of drug utilisation is important for both clinical and economic reasons.
Several factors influences prescribing behaviour of clinicians, therefore, to improve prescription behaviour, it is necessary to understand predictors of those behaviours [17, 18]. This paper highlights the prescription patterns and assesses the predictors of antibiotics co-prescription with artemether-lumefantrine (AL), the first line recommended antimalarial drug in Tanzania. The study was conducted within 8 government health facilities found in two Health and Demographic Surveillance Systems sites that presented with fever or history of fever and treated with AL.
The INDEPTH Effectiveness and Safety Studies of Anti-malarial Drugs in Africa (INESS) is an exciting new platform that aims to enable African researchers to carry out large Phase IV trials . INDEPTH Network Effectiveness and Safety Studies of Antimalarial Drugs in Africa platform (INESS) operates in two HDSSs in Rufiji District, Coast Region, and in Kilombero and Ulanga Districts, around the town of Ifakara, Morogoro Region, Tanzania. More explanations about the INESS platform is further explained by Masanja .
The study was conducted in 8 selected health facilities located in the Rufiji and Ifakara HDSS areas from May 2010 to December 2011. The Ifakara HDSS, situated 320 km south- west of Dar es Salaam, has been in operation since 1996. It covers part of Kilombero and Ulanga districts with a total population of 99,000 people, served by 14 health facilities . Out of these 14 health facilities in Kilombero & Ulanga districts only two health centers have capacity of diagnosing malaria by using microscopy, the remained facilities does not have that capacity. They are dispensaries and do not have microscopy neither trained laboratory technicians. The Rufiji HDSS is situated approximately 100 km south of Dar es Salaam and has been operational since 1998. It contains a population of approximately 85,000 people served by a total of 16 health facilities . In Rufiji only 2 health centers and one dispensary can diagnose malaria by using microscopy. 13 health facilities do not have microscopy.
The study design was a cohort event monitoring which was observational, longitudinal and prospective. All patients prescribed AL from the 8 selected health facilities within HDSS area were recruited. Patients were asked to come to the health facility on day 3 and day 7 for clinical evaluation and assessing their prognosis including if they have experienced any of the side effects. They could come at any day as well when they experienced any adverse event or if they have any doubts. If patients did not come at the health facility on scheduled days, they were immediately followed up on the following day at their respective households by a trained field worker, and for some patients follow ups were conducted by using phones. Phone was only used for those with mobile phones and did not turn to the health facility on scheduled days. Patients were declared lost to follow up if three attempts have been made to trace him/her at his/her households and five times by using mobile phone. Information on demographic, complaining symptoms, laboratory investigations, past medical history, past medical history, medication used and all events were recorded at recruitment and during follow ups.
All patients attended 8 selected health facilities in Ifakara and Rufiji HDSS areas that were prescribed with artemether-lumefantrine for malaria treatment regardless of their demographic characteristics.
The INESS platform and its modules passed through and were reviewed and approved by the Tanzanian National Institutes of Medical Research and IHI’s Ethical Review Boards with reference number IHI/IRB/No.A67-2009.
At recruitment and after obtaining the informed consent for participation in the study, data collection was done using a standardized questionnaire developed in English and translated into Kiswahili. Iinformation on demographic, complaining symptoms, laboratory investigations, past medical history, present medical history, medication used, history of drug reactions and all events were collected. A trained clinician interviewed patients as they come for treatment and once they were prescribed with antimalarial a clinician filled in a clinical questionnaire. Follow up information was collected by trained field workers using a standardized questionnaire on day 3 and 7.
Data management and analysis
All questionnaires used to collect information at recruitment and at follow up were taken for manual editing, validation and data entry which was done using the Epidata 3.1 . Data entry was done by Ifakara Data management unit and double entry was done to minimize data entry errors. Quality of data was done by re-interviewing the patients by the field supervisor. Data cleaning and analysis was done using Stata 11 . Descriptive statistics was used in reporting the major results and findings on the prescription patterns and estimation of drugs per encounter. Logistic regression was used in the assessment of predictors of antibiotics co-prescriptions. Clustering was done for health facility, assuming that individuals attending the same facility are more homogeneous. Statistical significance was based on the p-value being less than 0.05.
Demographic and clinical information
Demographic characteristics and clinical information of the study population
Total (N = 11648)
Age, median (Inter quartile range)
6.4 (2 – 19)
Under fives, n (%)
Female, n (%)
Positive malaria n, (%)
Temperature, mean ± SD
37.7 ± 0.6°C
Taken medicine before going to health facility, n (%)
Average number of drugs prescribed, mean ± SD
2.4 ± 0.8
Proportion co-prescribed AL with antibiotics, n (%)
All patients included in the cohort took AL, and the average number of drugs prescribed was 2.4 drugs per patient on a single clinical visit with some receiving as many as seven drugs. Common drugs co-prescribed with AL were a class of analgesics with 51% of patients and antibiotics were co-prescribed with AL in 20% of encounters. Other classes of drugs were co-prescribed with AL in less than 5% of the patients.
Analysis of AL and antibiotics co-prescription
Univariate and multivariate predictors for AL co-prescribed with antibiotics
P - value
P - value
< 5 years
5 + years
0.47 - 0.84
0.46 - 0.85
0.91 - 1.145
0.98 - 1.20
0.71 - 1.16
0.64 - 1.12
0.72 - 1.87
0.71 - 0.05
0.84 - 2.50
0.84 - 2.30
Malaria test results
1.34 - 3.34
1.65 - 2.97
0.82 - 1.57
0.69 - 1.54
Presumptive treatment is still practiced in rural areas of Tanzania, as evident in this study where 56% of patients attending to government health facilities were treated with AL without parasitological confirmation. This might be due to the WHO’s integrated management of childhood illness (IMCI) strategy . The IMCI strategy, allows children under five years to be presumptively treated on malaria . Regardless of the cost effectiveness of IMCI as explained in , there is a need to revise strategies for malaria treatment for children under five for improved malaria treatment outcomes and observation of other fever caused diseases. As Okebe and colleagues and Winskill et al.[26, 27] suggested, children aged 5–15 have higher odds of having malaria than those under five, and this might be due to more focus on under five and causes disease burden to shift to higher age. The Tanzanian National Guidelines for diagnosis and treatment of malaria (2006) stress the use of parasitological confirmation to supplement on clinical symptoms of malaria, and allows for presumptive treatment only when facilities have no laboratory or malaria rapid diagnostic test .
Findings from this study shows that presumptive treatment was done for all age groups; under five and those above 5 years. Similar results of presumptive treatment for malaria patients above 5 years was fund in study done in Kenya . Presumptive treatment is commonly due to lack of laboratory expertise and stock-out of mRDT. The practice is commonly done in high transmission areas like the study area . This study shows 20% of patients who were treated with AL were negative, this might be due to poor training of laboratory technicians and poor slides management which leads to mistrust of results and hence clinicians dispensing AL basing on clinical symptoms . Also reported that in some cases clinicians tends to use “mind lines” instead of guidelines when it comes to malaria treatment .
The mean number of drugs prescribed was 2.4 drugs per patient per encounter, which is above the WHO guidelines on rational use of drugs with reference values of (1.6-1.8) drugs per encounter . Since all patients received AL then there was a mean of 1.4 drugs co-prescribed with AL observed in rural settings of Tanzania. The study had more children, and number of drugs per encounter seems lower as compared to 3.2 per encounter reported for children in Uganda . Patient receiving the least number of drugs were the one who received AL alone and maximum number of drugs prescribed was 7 drugs per encounter. The number of drugs prescribed was relatively high as compared to 2.1 per person per encounter reported in previous study in Kilombero District (an area included in this study) .
Analgesics were commonly prescribed class of drugs as more than 50% of patients prescribed AL were co-prescribed it with Analgesics. This is a common practice to clinicians and reported in other countries such as Sudan  and Yemen . History of fever or presenting fever suggested the use of these Analgesics , even though the mean temperature did not suggest that as per WHO guidelines . There is a good reason for prescribing analgesics with AL for patients presenting with fever, as they might need medicines to manage fever while continuing with antimalarial treatment.
The study indicates that antibiotics were co-prescribed for 20% of encounters which is less compared to 30.8% observed in Ghana . Antibiotics are associated with some adverse reactions  and hence need to be used with great care to reduce those reactions. Other classes of drugs were co-prescribed with AL but in lower rates of less that 5% includes micronutrients supplements, antihelminths, antihistamines and antipsychotics.
Furthermore this study assessed the predictors of antibiotics co-prescription. Predictors found to be associated with the risk of being co-prescribed of other drugs with AL were age group and type of diagnosis (positive, negative and not tested). Children aged less than five years were more likely to be co-prescribed with antibiotics than those aged 5 years and more (Table 2). Similar findings were reported by Torvi et al. in . This might be due to paediatrics being in high risk to suffer from recurrent infections of other systems such as the respiratory tract and gastrointestinal system as seen from Figure 1 that cough was a major symptom after fever and headache .
Patients with fever who had negative results on malaria, due to lack of laboratory services, clinicians tend to deal with all possibilities by giving antimalarial if fever was due to malaria and antibiotics if fever was caused by bacterial infection or analgesics for fever itself. A similar observation was done in Zanzibar as those with clinical diagnosis were more likely to be co-prescribed with antibiotics as compared to those with malaria rapid diagnosis tests (mRDT). Those who were not tested were presumptively treated and IMCI guidelines were used for children under five years . For patients positive tested with malaria co prescription was given when deemed necessary as clinicians were almost certain of patient’s problem. For those not tested, co prescription was done basing on clinical symptoms and clinicians used their knowledge at best to assess the need for the co-prescription .
Fever is still the main complain regardless malaria decline. Presumptive treatment is still practised. When a child is having fever and tested malaria negative clinicians tends to give more drugs including atimalarial to cure for all possibilities.
More training and supervision of clinicians’ prescription pattern especially to children to avoid concomitant use of antibiotics.
Authorities should make sure that facilities are equipped with mRDT or laboratory for better malaria diagnosis and minimise the un-necessary prescription of antibiotics.
Study was conducted for outpatients who were treated with artemether-lumefatrine and can never be generalized for in-patients treated with any antimalarial drug or outpatients not treated with artemether-lumefatrine. The study was non-interventional and did not assess whether prescription was appropriate for reported symptom and according to diagnosis.
The authors thank the Rufiji and Ifakara Health and Demographic Surveillance System community, the INESS Tanzania team, and all who participated in one way or another the study. The cooperation of patients from 8 selected health facilities is highly appreciated. Special thanks to the INDEPTH secretariat for their invaluable support. Thanks to Masoud Mahundi for the language editing. The study was financed by Bill and Melinda Gates foundation.
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