E-Prescribing and Clinical Decision Support: Reducing Medication Errors in African Hospitals

The Scale of Medication Errors Globally and in Africa

Medication errors are among the most common and most preventable causes of patient harm in healthcare systems worldwide. The WHO estimates that medication errors cause at least one death every day and injure approximately 1.3 million people annually in high-income countries alone. In low- and middle-income country settings — where staffing is stretched, clinical workloads are high, drug names may be unfamiliar to recently trained prescribers, and paper-based systems offer no real-time checks — the burden of medication error is likely higher, though substantially under-reported.

In Cameroon and across the CEMAC region, common sources of medication error include illegible handwritten prescriptions, confusion between drugs with similar names (look-alike, sound-alike errors), incorrect dose calculation for children based on weight, failure to check for drug allergies before prescribing, and drug interactions that are not recognised at the point of prescribing. Each of these error types is preventable. Electronic prescribing, combined with clinical decision support, addresses all of them.

What Is E-Prescribing?

E-prescribing — electronic prescribing — replaces the handwritten prescription with a digital order created by the clinician in the hospital management system. Instead of writing a drug name, dose, route, and frequency on paper and handing it to a patient or sending it to the pharmacy, the clinician enters the prescription directly into the HMS. The prescription is transmitted electronically to the pharmacy, where it appears in the dispensing queue without any manual transcription step.

The benefits of simply eliminating handwriting are substantial. Illegibility is one of the most frequent causes of dispensing error in Cameroonian pharmacies — a handwritten "5 mg" misread as "50 mg" can have catastrophic consequences with certain drugs. E-prescribing eliminates this risk entirely.

But e-prescribing is most powerful when combined with clinical decision support (CDS) — real-time checks that evaluate the prescription against the patient's clinical record and alert the clinician to potential problems before the prescription is finalised.

Clinical Decision Support: The Five Core Alert Types

Clinical decision support in an e-prescribing system performs five fundamental checks at the moment of prescribing:

1. Drug-Drug Interaction Checking

When a clinician prescribes a new drug, the CDS engine checks it against all current medications on the patient's active medication list. If a clinically significant interaction exists — for example, prescribing warfarin alongside cotrimoxazole, which substantially increases bleeding risk — an alert is displayed before the prescription can be confirmed. Alerts are typically graded by severity: informational (mild interaction, monitor), warning (moderate interaction, consider alternatives), and critical (contraindicated combination, do not prescribe without specialist input).

2. Allergy Checking

Before any prescription is confirmed, the CDS system checks the prescribed drug against the patient's documented allergy record. If the patient has a documented allergy to penicillin and the clinician prescribes amoxicillin, a critical alert fires immediately. This is perhaps the most life-saving function of clinical decision support — anaphylaxis following administration of a drug to a patient with a known allergy is one of the most tragic and entirely preventable adverse events in healthcare.

3. Dose Range Checking

The CDS engine compares the prescribed dose against reference ranges for the drug and route, adjusted for the patient's age, weight, and renal and hepatic function where these are documented. A paediatric dose error — prescribing an adult dose to a child — is flagged before the prescription is confirmed. Similarly, a dose that is below the therapeutic range (and therefore unlikely to be effective) generates an informational alert.

4. Renal and Hepatic Dose Adjustment

Many drugs require dose reduction or complete avoidance in patients with impaired renal or hepatic function. Metformin, for example, is contraindicated in significant renal impairment due to the risk of lactic acidosis. When renal function results (serum creatinine, eGFR) are documented in the patient record, the CDS engine can apply drug-specific renal dose adjustment rules and alert the clinician when a prescribed dose is inappropriate for the patient's level of function.

5. Duplicate Therapy Checking

When the same drug — or two drugs from the same therapeutic class — are prescribed simultaneously, the system flags the duplication. A patient inadvertently prescribed two statins simultaneously, or two antihypertensive agents from the same class, is exposed to unnecessary risk without additional therapeutic benefit.

Formulary Management

A drug formulary is the approved list of medicines that a facility has committed to stocking and using — typically aligned with the WHO Essential Medicines List, the national essential medicines list of Cameroon (Liste Nationale des Médicaments Essentiels, LNME), and any specific therapeutic protocols approved by the facility's pharmacy and therapeutics committee.

An e-prescribing system with formulary management restricts prescribing to approved formulary items by default, with a defined process for requesting non-formulary drugs when clinically indicated. This has several benefits:

• Cost control: Prescribers default to the most cost-effective approved option rather than prescribing brand-name products when generics are available
• Stock alignment: Prescribing is constrained to drugs that the pharmacy actually stocks, reducing the rate of prescriptions that cannot be filled
• Protocol adherence: Formulary management enforces therapeutic protocol compliance, ensuring that first-line treatments are used before escalating to more expensive or complex alternatives
• Procurement planning: Consumption data from e-prescribing feeds directly into procurement forecasting, enabling the pharmacy to maintain optimal stock levels

For Cameroonian hospitals, formulary alignment with the LNME also supports engagement with the national pharmaceutical regulatory authority (DPHM — Direction de la Pharmacie, du Médicament et des Laboratoires) and facilitates participation in national procurement frameworks.

Controlled Substance Tracking

Controlled substances — opioid analgesics, certain benzodiazepines, ketamine, and other scheduled drugs — require more stringent management than standard medicines in Cameroon, consistent with the requirements of international drug control conventions and MINSANTE regulations. Paper-based controlled substance registers are legally required in most facilities, but they are laborious to maintain and vulnerable to falsification.

An e-prescribing system with controlled substance tracking provides:

• Mandatory authorisation: Prescriptions for scheduled drugs require digital authorisation from an appropriate authority (for example, a senior clinician or pharmacy supervisor) before dispensing can proceed
• Automatic register entry: Each dispensing event is automatically recorded in a digital controlled substance register, eliminating the manual register maintenance that currently consumes significant pharmacy time
• Quantity reconciliation: The system flags discrepancies between prescribed quantities, dispensed quantities, and physical stock on hand, enabling rapid detection of diversion or loss
• Audit trail: A complete, tamper-evident audit trail of every controlled substance prescription, authorisation, and dispensing event supports regulatory inspections and internal governance

The Prescription-to-Dispensing Closed Loop

The most significant safety benefit of integrated e-prescribing is the closed-loop medication management process. In a paper-based system, the chain from prescription to administration involves multiple handoffs — clinician to patient to pharmacy, pharmacy to nurse, nurse to patient — each of which is a potential point of error. Information may be misread, misheard, or simply lost.

In a closed-loop digital system:

1. The clinician enters the prescription in the HMS, CDS checks are applied, and the prescription is confirmed
2. The prescription appears electronically in the pharmacy dispensing queue — no transcription, no courier, no lost paper
3. The pharmacist verifies the prescription, dispenses the drug, and records the dispensing event, automatically updating stock levels
4. For inpatient medications, the nurse receiving the drug scans the patient wristband and the drug barcode (where barcode infrastructure exists) to confirm the right drug is being given to the right patient at the right time
5. The administration is recorded in the HMS, completing the closed loop

At every step, the patient's identity, the drug identity, and the dose are verified against the original prescription — eliminating the class of errors that arise from manual information transfer.

WHO Essential Medicines List Application in the CEMAC Region

The WHO Essential Medicines List (EML) — currently in its 23rd edition — defines the medicines that satisfy the priority healthcare needs of a population. Cameroon's LNME is derived from the WHO EML and adapted to national disease burden, regulatory status, and procurement capacity. E-prescribing systems deployed in CEMAC countries should have the regional LNME (or relevant national list) embedded as the default formulary, with the ability to configure facility-specific additions or restrictions.

Aligning e-prescribing with the EML also supports rational medicines use — a priority for MINSANTE and international partners including WHO and the World Bank. Facilities that can demonstrate measurable improvements in prescribing rationality (for example, reduced antibiotic prescribing for viral conditions, reduced injection use, increased use of first-line treatments) are well positioned for engagement with quality improvement programmes and performance-based financing schemes.

Benefits of E-Prescribing for Cameroonian Health Facilities

The evidence base for e-prescribing benefits is substantial and consistent across settings:

For Cameroonian hospitals operating under cost pressure, the combination of error reduction and cost control delivers a compelling return on the investment in digital infrastructure.

Barriers to E-Prescribing Implementation in Africa

Implementation of e-prescribing in Cameroonian health facilities faces real challenges that must be planned for rather than minimised:

• Connectivity: E-prescribing requires the clinician's workstation and the pharmacy to be on the same network. Where reliable local area network infrastructure is absent, e-prescribing cannot function. Facilities should audit their network infrastructure before selecting an e-prescribing solution.
• Clinician adoption: Prescribers accustomed to handwritten prescriptions may perceive digital entry as slower initially. Investment in training and the design of fast, intuitive prescription entry screens is essential for adoption.
• Drug database maintenance: CDS alerts are only as good as the drug interaction and dose range database that powers them. The database must be regularly updated as new drugs are added to the formulary and as new interaction evidence emerges.
• Power supply: E-prescribing workstations require reliable power. For facilities with intermittent grid supply, uninterruptible power supply (UPS) infrastructure must be in place.

Each of these barriers is manageable; none is insurmountable for a facility committed to improving medication safety.

How OPES Health Systems' E-Prescribing and CDS Module Works

OPES Health Systems has built e-prescribing and clinical decision support into the core clinical workflow of its HMS, designed specifically for the connectivity, infrastructure, and clinical context of hospitals and clinics in Cameroon and the CEMAC region. Prescriptions are entered at the point of care — consultation room, ward, emergency department — and are subject to real-time CDS checks for drug-drug interactions, allergy conflicts, dose range violations, and renal or hepatic contraindications, all drawn from a regularly updated regional drug database.

The formulary module is pre-configured with Cameroon's LNME and can be customised to each facility's approved medicine list and therapeutic protocols. Non-formulary requests are managed through a configurable approval workflow. Controlled substance prescriptions require a second-level authorisation before the pharmacy dispensing queue receives them, and all controlled substance events are recorded in a tamper-evident digital register.

The system operates on a local area network and functions without internet connectivity, ensuring that e-prescribing is available even during internet outages. For inpatient settings, the closed-loop administration recording module supports barcode-based patient and drug verification where hardware is available. Pharmacy stock is automatically updated with each dispensing event, giving the stores manager a real-time view of consumption to support accurate, timely procurement.

OPES provides full implementation support including drug database configuration, formulary setup, and prescriber training — recognising that the success of e-prescribing depends as much on implementation quality as on the software itself.

Conclusion

Medication errors are a silent epidemic in African hospitals — one that is neither inevitable nor acceptable. E-prescribing and clinical decision support are proven technologies with a strong evidence base for reducing error rates, controlling costs, and improving patient outcomes. For hospitals in Cameroon and across the CEMAC region, investing in integrated e-prescribing is not merely a technology upgrade; it is a patient safety imperative. The question is no longer whether digital prescribing is feasible in African health facilities — it is how quickly it can be implemented at scale.