Pet Health 5 min read Mar 21, 2026

Understanding Your Vet's Prescription: A Pet Owner's Guide

Prescription labels can be confusing. We break down the most common terms so you always know what your pet is taking and why.

Understanding Your Vet's Prescription: A Pet Owner's Guide

A prescription label packs a lot of information into a small space. Here's how to decode the most common elements.

The Drug Name

Medications have two names: the brand name (e.g., Vetoryl) and the generic name (e.g., trilostane). Both refer to the same active ingredient. Generic versions are often less expensive and equally effective.

Sig (Instructions)

"Sig" is Latin for "label." It contains the dosing instructions: how much, how often, and how to give it. Common abbreviations include:

  • SID / q24h — once daily
  • BID / q12h — twice daily
  • TID / q8h — three times daily
  • PO — by mouth
  • AU / AD / AS — both ears / right ear / left ear
  • Quantity and Refills

    The quantity dispensed (e.g., "30 tablets") and the number of authorized refills appear on every label. Keep track — many chronic medications require updated prescriptions annually or semi-annually.

    Expiration Date

    Always check the expiration date. Compounded medications may have a shorter shelf life than commercial drugs. Store as directed — many liquids require refrigeration.

    When to Call the Pharmacy

    If you're ever unsure about the dose, the schedule, or how to administer a medication, call us before giving it. It's always better to ask.

    W
    Wespaw Pharmacy Team
    Licensed Compounding Pharmacy · Astoria, NYC