|Year : 2017 | Volume
| Issue : 2 | Page : 67-71
Evaluation of antimalarial drugs usage according to WHO prescribing indicators in a tertiary health facility in Maiduguri, Northeastern Nigeria
Phillip Samuel Maryah1, Ballah Akawu Denue2, Nasiru Yakubu Ikunaiye1, Roseline I Aderemi-Williams3, Cecilia B Akawu4
1 Department of Pharmaceutical Services, University of Maiduguri Teaching Hospital, Maiduguri, Borno State, Nigeria
2 Department of Medicine, College of Medical Sciences, University of Maiduguri, Maiduguri, Borno State, Nigeria
3 Department of Clinical Pharmacy, Faculty of Pharmacy, University of Lagos, Lagos, Nigeria
4 Department of Geography, Medical Geography Unit, University of Maiduguri, Maiduguri, Borno State, Nigeria
|Date of Submission||27-Mar-2017|
|Date of Acceptance||23-Jun-2017|
|Date of Web Publication||15-Sep-2017|
Ballah Akawu Denue
Department of Medicine, College of Medical Sciences, University of Maiduguri, PMB 1069, Maiduguri, Borno State
Source of Support: None, Conflict of Interest: None
Background: The high morbidity and mortality associated with malaria especially in sub-Saharan Africa such as Nigeria calls for prompt preventive and curative measures including adherence to standard treatment guideline.
Aim: To assess the level of adherence with the five defined WHO prescribing key indicators.
Methods: This was a retrospective evaluation of the performance of antimalarial drugs prescribing practice among clinicians from January to December 2014. It was done through a set of drug prescribing indicators developed by WHO and the International Network of Rational Use of Drugs (INRUD).
Results: Of the 385 patients prescription randomly generated from the record of 12,477 patients in this descriptive study, a total of 143 (37.1%) had antimalarial prescription(s) with no gender variation. The evaluation of the studied antimalarial drug prescriptions through defined WHO prescribing indicators revealed an average number of drugs per encounter of 3.9, with 37.4% of the prescriptions written in generic names. All the antimalarial drugs were prescribed from the National Drug Formulary, with injectable form constituting 4.7%.
Conclusion: This study shows suboptimal compliance with WHO prescribing indicators with respect to average number of antimalarial per encounter and prescription in generic names. The proportion of antimalarials prescription in injectable form falls within the WHO acceptable limit of ≤10%. All antimalarial drug prescriptions in this study were from essential drug list. We, therefore, recommend rational antimalarial drug prescription in conformity with WHO/INRUD core drug prescribing indicators.
Keywords: Antimalarial drugs, International Network of Rational Use of Drugs, prescribing indicators, WHO
|How to cite this article:|
Maryah PS, Denue BA, Ikunaiye NY, Aderemi-Williams RI, Akawu CB. Evaluation of antimalarial drugs usage according to WHO prescribing indicators in a tertiary health facility in Maiduguri, Northeastern Nigeria. Port Harcourt Med J 2017;11:67-71
|How to cite this URL:|
Maryah PS, Denue BA, Ikunaiye NY, Aderemi-Williams RI, Akawu CB. Evaluation of antimalarial drugs usage according to WHO prescribing indicators in a tertiary health facility in Maiduguri, Northeastern Nigeria. Port Harcourt Med J [serial online] 2017 [cited 2018 May 22];11:67-71. Available from: http://www.phmj.org/text.asp?2017/11/2/67/214870
| Introduction|| |
Rational use of drugs against most common and life-threatening tropical diseases such as malaria remains a huge challenge, particularly in sub-Saharan African region. The region carries a disproportionately high share of the global malaria burden. Sub-Saharan Africa contributes an estimated 90% of global episodes of clinical malaria and 90% of global malaria mortality., Resistance to both insecticide-treated net and common antimalarial agents in addition to other factors such as increased production and consumption of substandard and fake drugs, financial and budgetary constraints by some heads of government, market inefficiency, distortions, behaviour of health systems and lack of effective vaccines are responsible for persisting threat pose by malaria.,,, Multidrug-resistant Plasmodium falciparum malaria continues to spread throughout the world. The outcome of the 2002–2004 drug efficacy research conducted in the six geopolitical zones in Nigeria showed a high level of resistance to antimalarial drugs especially chloroquine that ranged from 5.8% to 96.3%. This report led to change in national antimalarial treatment policy in the year 2005 by the adoption of artemisinin-based combination as a first line medication against malaria. It was based on the WHO recommendation that an antimalarial agent may not be used as the first line when the level of resistance is above 25% in an area. Unfortunately, several studies on malaria have reported inappropriate prescribing practices in both public and private health care facilities due to lack of adherence of prescribers with the standard treatment guidelines (STGs).,,,, To optimise the availability and appropriate use of drugs for patients, a well-designed, comprehensive national drug policy is necessary. The WHO and the International Network of Rational Use of Drugs (INRUD) have developed a set of drug prescribing indicators to be used as measures of prescribing performance in health-care setting. Although the chemotherapy for malaria adopted based on a recommendation from WHO/INRUD has been adjudged successful by some authorities in Nigeria, to the best of our knowledge, adherence of antimalarial drugs usage according to WHO prescribing indicators have not been reported in Northeastern Nigeria. We therefore retrospectively reviewed the antimalarial drug prescription over 1 year period to assess the level of adherence with the five defined WHO prescribing key indicators.
| Methods|| |
Retrospective study was carried out in National Health Insurance Scheme Pharmacy Unit, University of Maiduguri Teaching Hospital.
Maiduguri, the capital of Borno State, is among the largest cities in Northeastern Nigeria with an estimated population of 728,539. It lies on latitude 115°N and longitude 135°E and occupies an area of 50,778 km 2. The climate of Maiduguri is favourable, with a mean annual temperature of 34.8°C. Maiduguri is a cosmopolitan town which is inhabited by various ethnic groups, but the most dominant ethnic group is Kanuri (www.bornostategov.ng).
The study period was January 2014–December 2014.
Population of the study
Sample size determination
The sample size was determined using this formula:
Where n = sample size, z = standard normal deviate at 95% confidence interval (CI) which is 1.96 z = 1.96p = proportion of the study population expressing certain characteristics is 50% which is the same thing with 0.5.p =0.5 d = degree of freedom or significant level is 0.05, d = 0.05, n = 385.
This is simple random sampling.
Prescriptions collected from January to December were numbered from 1 to 12,477. These numbers generated was entered into SPSS and randomly selected 385 numbers out of the 12,477.
Data management and analysis
The 385 numbers selected were then sorted out from the 12,477 prescriptions and were subjected to analysis using SPSS Inc. SPSS statistics for windows, version 16.0 (Chicago IL, USA); SPSS Inc. 2008.
WHO prescribing indicators
The following WHO/INRUD prescribing indicators were used in this study and were calculated using standard methods:
- Average number of drugs prescribed per encounter (whether the patient actually received the drugs or not). Optimal level: ≤3
- Percentage of drugs prescribed by generic name. Optimal level: 100%
- Percentage of patient encounters with an antibiotic prescribed. Optimal level: ≤30%
- Percentage of patient encounters with an injection prescribed. Optimal level: ≤10%
- Percentage of drugs prescribed from the national essential drugs list (EDL) or the facility's formulary. Optimal level: 100%.
Procedure for calculating prescribing indicators
After data were entered and cleaned carefully, different prescribing indicators were computed using the following formula adopted from the WHO's manual for prescribing indicators assessment.
- Average number of drugs per encounter = total number of drugs prescribed/total number of encounters sampled
- Percentage of drugs prescribed by generic name = (number of drugs prescribed by generic name/total number of drugs prescribed) × 100
- Percentage of encounters with an antibiotic prescribed = (number of patient encounters with an antibiotic/total number of encounters sampled) × 100
- Percentage of encounters with an injection prescribed = (number of patient encounters with an injection prescribed/total number of encounters sampled) × 100
- Percentage of drugs prescribed from EDL = (number of drugs prescribed from EDL/total number of prescribed drugs) × 100.
| Results|| |
Of the 385 patients prescription randomly generated from the record of 12,477 patients, the mean age of the females was higher than males, P = 0.001, 95% CI (2.93–4.99). There was no significant difference in the distribution of the studied participants based on gender, P = 0.06 (−0.31–20.71). A total of 143 (37.1%) out of 385 had antimalarial prescription(s) with female constituting 76 (53%); the proportion of female prescription containing antimalarials was not significantly higher than those for males, P = 0.56, 95% CI (−11.49–24.09). The mean ages of the participants, distribution based on gender and frequency of prescriptions with antimalarial medication is as shown in [Table 1].
Evaluation of the studied antimalarial drug prescriptions in comparison with the defined WHO prescribing indicators is as depicted in [Table 2]. It indicates that 37.4% were prescribed in generic names. All the antimalarial drugs were prescribed from the National Drug Formulary (NDF). The average number of antimalarial drugs prescribed per encounter was 1.0280, while the overall average number of drugs on prescription sheet per encounter was 3.3532. Prescriptions with antimalarial drugs showed a higher average number of drugs per encounter of 3.9371 than those without of 3.008, P = 0.001, 95% CI (2.87–4.79).
|Table 2: Description of antimalarial prescriptions using World Health Organization prescribing indicators in comparison with World Health Organization reference|
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[Figure 1] shows the frequency of the number of drugs per prescription sheet stratified by malaria status. Prescriptions with antimalarial drugs had a higher number of drugs than those without antimalarial drugs.
| Discussion|| |
The morbidity and mortality attributable to malaria in sub-Saharan Africa is appalling. It is estimated that at least 90% of global death due to malaria occur in Africa. Several factors are responsible for the lingering threat of malaria in sub-Saharan Africa including Nigeria; inappropriate, ineffective and infrequent drug use due to irrational prescribing practices.,,, Other factors include lack of antimalarial drugs, absence or failure to adhere to STGs, dearth of laboratory facilities and trained scientists and poor budgetary funding., The WHO developed a core prescribing indicators to address the menace of irrational prescriptions and use of drugs that has for a long been known to feature in health-care facilities in developing countries. In this report, we evaluated the antimalarial drug usage in our facility through WHO core prescribing indicators.
The average number of drugs prescribed per encounter of 3.9 obtained from this study imply polypharmacy, it was significantly higher than WHO recommended a limit of <2. Our finding is similar to previous report by Eze and Olowu from Nigeria of 3.9 and yet lower than 4.6 obtained by Irute John et al. With few exception, such as reports from Yemen  Ghana, Gaza, Kuwait  and Saudi Arabia  that reported average number of drugs per encounter ranging from 1.3 to 2.2, most studies from Mediterian region and sub-Saharan Africa that bears the most burden of Malaria reported higher average number of drugs per encounter.,,, Increased number of drugs per encounter which suggest polypharmacy, it is associated with several risks such as potential drug–drug interactions, fatal combined or synergistic medication side effect, adverse drug reaction, medication non-compliance, poor treatment outcome and wastage of resources.
The WHO recommends all drug prescriptions to be issued in generic name, with an optimal value of 100%. Drug prescription written in generic names avoids confusion during dispensing and reduces the cost of purchasing branded drugs. It also enhances information exchange and communication between health-care providers. However, despite advantages of drug prescription in generic names and its promotion by WHO, several studies including the index study reported generic prescribing <50%.,,, Drug prescription in generic names of 37.4% in this study underscores the need to advocate drug prescription in generic names in our health institutions. Similar studies from Nigeria by Irute John et al. and Igboeli et al. reported 43.1% and 39.6%, respectively. However, similar studies conducted in Ghana, Ethopia, Saudi Arabia  reported higher rate of 60.5%, 79.2% and 61.2%, respectively. Comparatively, reports from Gaza strip  and Bahrain  reported lower antimalarial drug prescription of 5.5% and 14.3%, respectively. Several factors influence health-care providers prescribing behaviours: Level of education, training, peer group, workplace environment, drug supply system, advertising and drug detailing and promotion, control and regulatory measures, drug information and misinformation and patient demand.
All antimalarial drug prescriptions evaluated in this report was from EDL issued by the WHO and adopted by NDF. The EDL/NDF provide a framework for rational drug prescription as drugs on the list are well-established drugs, already tested with proven efficacy and potency in clinical use and lower costs. The conformity of our antimalarial drug prescription with the national guideline adopted from WHO is not surprising because drugs in our facility are procured through Drug Purchase Committee with members drawn from relevant disciplines. Previous studies from other developing countries report higher than 80%.,, However, the WHO recommends that all drugs prescriptions should be from EDL/NDF.
In this study, injections were prescribed in 4.8% of encounters on average, which fall within WHO acceptable limit of ≤10%. Injections are potent, fast acting and useful formulation when clearly indicated. However, they are more expensive compared to other dosage formulation and require injection safety training. Furthermore, use of injections can increase the risk of blood transmissible infections such as viral hepatitis and HIV infections. Although some studies reported injection usage within acceptable limit of injection prescription ranging from 0.17% to 4.0%,,, several studies reported higher injection usage ranging from 23% to 38.1% clearly outside the ≤10% recommended by WHO.,, Over prescription of antimalarial drugs in injectable forms has been shown to be driven by misconception among both health-care workers and patient's perception of its superiority over other formulations.,,
| Conclusion|| |
This study shows suboptimal compliance with WHO prescribing indicators with respect to average number of antimalarial per encounter and prescription in generic names. The proportion of antimalarials prescription in injectable form falls within the WHO acceptable limit of ≤10%. All antimalarial drug prescriptions in this study were from EDL.
We therefore recommend rational antimalarial drug prescription to conform with WHO/INRUD core drug prescribing indicators.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2]