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CHAPTER 3: DOSAGE CALCULATION, MEDICATION PREPARATION, AND ADMINISTRATION – ESSENTIAL PRINCIPLES OF SAFE MEDICATION PRACTICE (Based on Henke's Med-Math)

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2025/2026 Written for academic year
Institution Diploma In Nursing
Course Diploma in Nursing
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This chapter focuses on the fundamental principles and procedures involved in dosage calculation, medication preparation, and safe drug administration. Based on concepts presented in Henke's Med-Math, students will develop the mathematical skills and clinical competencies necessary to accurately calculate medication dosages, prepare pharmaceutical formulations, and administer medications safely across various healthcare settings. Emphasis is placed on preventing medication errors, applying dimensional analysis and formula methods, understanding dosage forms, and adhering to professional standards of patient care.

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HENKE'S MED MATH CH. 3 DOSAGE CALCULATION,
PREPARATION & ADMINISTRATION
1. ac: before meals
2. pc: after meals
3. daily: every day, daily
4. bid: twice a day
5. tid: three times a day
6. qid: four times a day
7. qh: every hour
8. at bedtime: at bedtime, hour of sleep
9. qn: every night
10. stat: immediately
11. q2h or q2(degree symbol): every 2 hours
12. q4h or q4degree: every 4 hours
13. q6h or q6(degree): every 6 hours
14. q8h or q8(degree): every 8 hours
15. q12h or q12degree: every 12 hours
16. every other day: every other day
17. prn: as needed
18. 3 times weekly: three times per week
19. biw: twice per week
20. AD: right ear
21. AL: left ear
22. AU: each ear

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, HENKE'S MED MATH CH. 3 DOSAGE CALCULATION,
PREPARATION & ADMINISTRATION
23. HHN: handheld nebulizer
24. IM: intramuscularly
25. IV: intravenously
26. IVP: intravenous push
27. IVPB: intravenous piggyback
28. MDI: metered-dose inhaler
29. NEB: nebulizer
30. NGT or ng: nasogastric tube
31. OD: in the right eye




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