Every prescription label has a lot of information packed into a small space. Knowing how to read it correctly prevents dosing mistakes, missed refills, and dangerous interactions.
Patient name
Always confirm the name on the label is yours. This is the #1 dispensing error to catch — at home, before taking the first dose.
Medication name and strength
Most labels show the generic name in larger font and the brand in parentheses (or vice versa). Strength is the milligrams (mg) per pill or per ml of liquid. If you’ve been taking 500mg and the new bottle says 250mg, you’d need to take twice as many pills — confirm with your pharmacist before assuming.
Sig (the directions)
“Take 1 tablet by mouth twice daily” sounds simple but get it wrong and you can either underdose or overdose. Common abbreviations:
- BID = twice daily (about 12 hours apart)
- TID = three times daily (about 8 hours apart)
- QID = four times daily (about 6 hours apart)
- QD = once daily
- PRN = as needed (only when you have symptoms)
- PO = by mouth
- HS = at bedtime
- AC = before meals
- PC = after meals
Quantity and refills
“#30 with 2 refills” means you got 30 pills and can refill twice more. If you’re on a maintenance medication, set a reminder to call for a refill 5-7 days before you run out — pharmacies sometimes need to contact your doctor for re-authorization.
Warnings and special instructions
The colored stickers — “Take with food,” “May cause drowsiness,” “Avoid alcohol” — aren’t decorative. They’re often the difference between a medication working safely and a trip to the ER. Read every sticker, every time.
Expiration date
Most medications lose potency (not become dangerous) after expiration. The exception is liquid antibiotics, insulin, and EpiPens — these can become harmful or ineffective and should never be used past their date.