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Table 1 Categories of error types used in this study[15]

From: Medication errors related to transdermal opioid patches: lessons from a regional incident reporting system

Prescribing   Dispensing Administration and monitoring
Decision making Communication   
- Allergy - Allergy information - Ambiguous information on label - Contamination
    - Incompatibility errors
- Calculation error - Decimal place error - Incompatibility errors - Extra dose
- Interaction drug and disease - Ambiguous drug name - Contamination - Lack of control of patient identity
   - Expired drug  
- Interaction between drug and laboratory test - Ambiguous drug prescription - Omission of dose - Omission of dose
- Drug to drug interaction - P.r.n. prescription without a maximum limit - Omission of documentation of drug dispensing - Lack of documentation of the drug administration
- Extra drug - P.r.n. prescription without a minimum dose interval - Omission of control of the drug prescription - Lack of control of agreement between administered drug and prescribed drug
- Omission of a drug prescription    
- Wrong concentration - Omission of indication for treatment including p.r.n.prescriptions - Substitution error - Unordered drug
- Wrong drug form - Unordered drug - Wrong dose
- Wrong dose   - Unordered electrolyte - Wrong patient
- Wrong dosing interval   - Wrong concentration - Wrong dosing interval
- Wrong drug    
  - Illegible handwriting - Wrong drug form - Wrong rate
- Wrong route of administration - Omission of rate of infusion - Wrong dose - Wrong route of administration
- Wrong duration of treatment - Discrepancy between dose intervals - Extra dose - Wrong technique
- Wrong strength/unit   - Wrong strength per unit - Wrong time
- Omission of ordering laboratory tests - Discrepancy between indication of dose - Wrong dilution fluid - Omission of documentation of side-effects of the drug treatment
  - Wrong transcription   
  1. The error types are listed from left to right in the order of the medication process.