MEDICATION ERRORS AND DRUG INTERACTIONS
Medication Error:
- Preventable mistake leading to improper medication use
- May result in patient harm
- Can occur during prescribing, dispensing, administration, or monitoring
Causes of Medication Errors:
- Expired medicines
- Wrong dose or strength
- Incorrect timing
- Improper preparation
- Wrong dosage form
- Allergic drug use
- Unidentified drug interactions
Types of Medication Errors:
- Prescribing Error: Wrong drug, dose, or duration
- Omission Error: Missed dose
- Improper Dose Error: Overdose or underdose
- Unauthorized Drug Error: Drug given without prescription
- Deteriorated Drug Error: Expired or improperly stored drug
- Wrong Time Error: Incorrect timing
- Wrong Dosage Form Error: Incorrect formulation
- Wrong Drug Preparation: Incorrect dilution or mixing
- Wrong Administration Technique: Incorrect route or method
- Monitoring Error: Lack of patient monitoring
- Compliance Error: Patient not following instructions
- Other Errors: Calculation mistakes, abbreviations, LASA errors
Consequences of Medication Errors:
- Adverse drug reactions
- Treatment failure
- Increased complications
- Patient harm
Prevention of Medication Errors:
- Write clear prescriptions
- Avoid abbreviations
- Specify dose, route, and duration
- Check patient age and weight
- Verify allergies
- Double-check medicines before dispensing
- Monitor patient condition
LASA (Look-Alike Sound-Alike) Drugs:
- Drugs with similar names or appearance
- Examples: Cisplatin–Carboplatin, Epinephrine–Ephedrine
Prevention of LASA Errors:
- Manufacturers: Use distinct drug names
- Doctors: Write clearly, avoid abbreviations
- Pharmacists: Separate drugs, double-check, use alerts
- Patients: Verify medicine and understand its use
Tall Man Lettering: DOXOrubicin vs DAUNOrubicin
Drug Interactions:
- One drug affects another drug’s effect
- Includes drug–drug, drug–food, and drug–herb interactions
Mechanism of Drug Interactions:
- Pharmacokinetic: Affects absorption, distribution, metabolism, excretion
- Pharmacodynamic: Affects drug action at receptor level
Examples: Tetracycline + milk (↓ absorption), Warfarin displacement (↑ effect), Barbiturates (↑ metabolism)
Types of Drug Interactions:
- Drug–Drug: Aspirin + Warfarin (bleeding), Furosemide + Digoxin (toxicity)
- Drug–Food: Grapefruit juice (↑ drug levels), Dairy (↓ tetracycline absorption), Vitamin K foods (↓ warfarin effect)
Clinical Significance:
- May increase or decrease drug effect
- Can improve or worsen therapy
- Important in narrow therapeutic index drugs
- Risk increases with polypharmacy
Dr. Saint Paul is a pharmacy educator, Pharm.D graduate, and academic content creator from Jawaharlal Nehru Technological University Kakinada (JNTUK), where he completed his Doctor of Pharmacy (Pharm.D) degree between 2015 and 2021.
He has more than 7 years of experience creating pharmacy educational content, writing study materials, and reviewing academic articles for pharmacy students. He has also contributed guest articles to pharmacy education platforms, including PharmD Guru.
At D.PharmGuru, his work focuses on simplifying complex Diploma in Pharmacy (D.Pharmacy) subjects into easy-to-understand notes, practical explanations, and exam-oriented educational resources for students across India.
His areas of focus include Human Anatomy and Physiology, Pharmaceutics, Pharmacology, Pharmaceutical Chemistry, Hospital and Clinical Pharmacy, and other core D.Pharmacy subjects.
