TL;DR
Auxiliary Labels: Warning labels: Take with Food, May Cause Drowsiness, Do Not Crush, Refrigerate.
Auxiliary Labels
Definition
Warning labels: Take with Food, May Cause Drowsiness, Do Not Crush, Refrigerate.
Calculation Methods
Calculations relevant to auxiliary labels in pharmacy:
flow rate: Volume (mL) * drop factor / time (min). Example: 1000mL * 15gtt/mL / 480min = 31.25 gtt/min
days supply: quantity dispensed / (dose * frequency). Example: #90 tabs, 1 tab TID = 90/(1*3) = 30 days
percentage strength: w/v: g/100mL, w/w: g/100g, v/v: mL/100mL. Example: 2% hydrocortisone cream = 2g HC per 100g cream
Documentation
Proper documentation of auxiliary labels follows facility policies and regulatory requirements. All entries must be dated, timed, and signed. Errors are corrected with a single line through the incorrect entry, initialed and dated. Never erase or cover with correction fluid.
Exam Focus Areas
On the Ptcb exam(s), questions about auxiliary labels typically test:
- Mathematical calculations: dosage, days supply, dilutions, and compounding
- Drug classification, mechanism of action, and common side effects
- Drug interactions and contraindications that affect patient safety
Regulatory Context
Regulatory framework for auxiliary labels in pharmacy:
- Schedule V
- Lowest abuse potential. Examples: pregabalin, some cough syrups with codeine. Storage: May be OTC in some states with logbook
- Schedule I
- No accepted medical use, high abuse potential. Examples: heroin, LSD, peyote, ecstasy, marijuana (federal). Storage: Not dispensed in pharmacies
Why It Matters
Appropriate label selection tested on PTCB exam.
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