How to read a U.S. prescription label: a plain-English guide

Updated 2026-10-06 · Reviewed for accuracy by the EKO Labs team. Educational only; not medical advice.

When a U.S. pharmacy fills a prescription, it puts its own labelPrescribing information (label) the official FDA document for a medicine, with its uses, warnings and side effects. on the bottle, vial, box or pen carton. That label is written for you. Knowing what each part means helps you take the right medicine, at the right time, and get refills without trouble. This is general information; your pharmacist can explain your exact label.

What federal law requires on the label

Under the federal Food, Drug, and Cosmetic Act, the label on a dispensed prescription must show the name and address of the pharmacy, the prescription (serial) number, the date of the prescription or of its filling, the name of the prescriber, the patient's name if it is on the prescription, and the directions for use and any cautionary statements from the prescription. State pharmacy laws usually add more items.

The parts you will usually see

• Your name: check it every time. Never take a medicine labeled for someone else.
• Medicine name and strength: the brand or generic name and the strength (for example, mg or mg/mL). A generic is often labeled with its active ingredient, sometimes with "generic for" the brand.
• Directions: how much, how often and how to take or use it, exactly as your doctor prescribed.
• Rx number: the pharmacy's number for this prescription. You need it to order a refill or ask a question.
• Quantity and refills: how much was dispensed and how many refills are left. "No refills" means you need a new prescription from your doctor.
• Date filled and prescriber: when the pharmacy filled it and which doctor prescribed it.
• Expiration or discard date: do not use the medicine after this date. For compounded medicines this is called the beyond-use date, set by the pharmacy that prepared it.
• Pharmacy name, address and phone: who to call with questions about this medicine.

Colored warning stickers

Pharmacies often add small auxiliary stickers such as "Refrigerate", "Do not freeze", "Shake well" or "May cause drowsiness". They are short reminders; the full instructions are in the directions and the patient information.

The Medication Guide and patient information

For some medicines, including many GLP-1GLP-1 (glucagon-like peptide-1) a hormone the gut releases after eating. It helps release insulin, slows stomach emptying and signals fullness. injections, the FDA requires a Medication Guide: an FDA-approvedFDA-approved the FDA reviewed the medicine's safety and effectiveness for a specific use. handout in plain language about the most important risks. The pharmacy must give it to you when it dispenses the medicine. Read it, and keep it with the medicine. Brand-name products also come with the manufacturer's carton and package insert; your pharmacy label is added on top of those, not instead of them.

Language help

If you do not read English well, ask the pharmacy if it can print the label or the patient information in your language, or explain it with an interpreter. Many pharmacies can.

Red flags

• No pharmacy name, address or phone number on the label
• No patient name or no prescriber name on a prescription medicine
• Products labeled "research use only""Research use only" (RUO) a label on chemicals sold for laboratory work. These products are not made or approved for people. offered for people
• The medicine looks different from your last fill and nobody explained why

Questions to ask your pharmacist

• Is this the brand-name medicineBrand-name medicine the version sold by the company that got FDA approval, for example Ozempic® or Mounjaro®., a generic, or a compounded medicineCompounded medicine a version prepared by a licensed pharmacy for a specific patient's prescription. It is not itself FDA-approved.?
• How should I store it, and how long can it stay out of the refrigerator?
• What should I do if I miss a dose?
• Does this medicine interact with anything else I take, including vitamins and supplements?
• Can you give me the Medication Guide or patient information in my language?

At EKO Labs, our team can help you understand your prescription in Portuguese or English by phone. EKO Labs does not publish dosing instructions.

Sources: Federal Food, Drug, and Cosmetic Act, 21 U.S.C. 353(b)(2) (labeling of dispensed prescription drugs); FDA, 21 CFR Part 208 (Medication Guides for prescription drug products) and FDA's Medication Guides page. This guide is general information, not medical advice.