How to Complete a MAR Chart Correctly

A Medication Administration Record — commonly known as a MAR chart — is one of the most scrutinised documents in any care setting. It is a legal record of every medication given to a client, and when it contains errors, gaps, or illegible entries, it puts both the client and the provider at risk. CQC inspectors will examine MAR charts closely, and avoidable mistakes are among the most common reasons care providers receive requires improvement ratings for safety.

Getting MAR charts right is not complicated, but it does require consistent habits and a clear process. Here is what you need to know.

What Is a MAR Chart?

A MAR chart is a document — either paper or digital — that records every instance of medication being administered to a client. It typically shows the client's name, date of birth, each medication prescribed, the dose, the route of administration (oral, topical, etc.), and a grid where staff sign or initial each time the medication is given.

MAR charts are used in care homes, supported living, and domiciliary care settings. They are usually generated from a prescription or blister pack and must be kept for a minimum of three years after the last entry.

Common MAR Chart Errors to Avoid

These are the mistakes inspectors and pharmacists find most often:

• Unexplained gaps — a blank cell where a signature should be, with no code or explanation recorded
• Retrospective signing — signing for medication after the fact rather than at the time of administration
• Illegible entries — initials that cannot be matched to a named staff member
• Incorrect codes — using the wrong refusal or omission code, or failing to use codes at all
• Missing information — no dose, no route, no prescriber details, or medication added without a new prescription
• Crossing out without countersigning — corrections must be countersigned by a second staff member, not just crossed out

How to Complete a MAR Chart Correctly

1. Always sign at the time of administration

Never pre-sign a MAR chart before giving medication, and never sign after you have left the room. Sign at the moment the client takes the medication. This protects the client and protects you.

2. Use the correct codes for omissions

Every service should have a clear code system. Common codes include:

• R — Refused by client
• O — Out of stock / awaiting prescription
• H — Client in hospital
• S — Self-administering

A blank cell is never acceptable. If medication was not given for any reason, a code must be entered and a note made in the daily log explaining the circumstances.

3. Record changes immediately

If a client's medication changes — new prescription, dose change, or medication stopped — the MAR chart must be updated immediately. Do not continue using the old chart. Draw a line through the old entry, note the date the change was made, and begin a new entry with the updated details. Both the old and new entries should be countersigned.

4. Ensure all signatures can be identified

Every staff member who administers medication must have their full name, job title, and initials recorded on the MAR chart's signature sheet. If a locum, agency worker, or new employee administers medication, their details must be added before they sign.

5. Reconcile stock regularly

At the end of each medication round, the stock remaining should match the number of doses recorded on the MAR chart. Any discrepancy must be investigated and documented immediately — not left to the next shift.

Controlled Drugs — Additional Requirements

Controlled drugs (CDs) require a separate register in addition to the MAR chart. Two members of staff must witness administration, and both must sign both the MAR chart and the controlled drugs register. Stock must be counted at every shift handover and any discrepancy reported immediately to the registered manager and, if required, to the relevant authority.

Paper vs Digital MAR Charts

Paper MAR charts are still widely used, but they carry significant risk. Handwriting can be misread, signatures are difficult to verify, and a lost or damaged chart creates a gap in your evidence. Digital MAR charts remove most of these risks — entries are time-stamped, linked to named staff accounts, and cannot be altered retrospectively. Missed doses are flagged automatically, giving managers real-time visibility without waiting until the end of a shift.

What to Do When an Error Occurs

Medication errors happen even in well-run services. What matters is how they are handled. If an error is identified:

1. Ensure the client is safe — seek medical advice if there is any risk to their health
2. Record the error accurately in the MAR chart and the incident log — do not attempt to alter or hide it
3. Complete a medication error report form
4. Notify the registered manager and, where appropriate, the client's GP or prescriber
5. Review how the error occurred and update procedures to prevent recurrence
6. Share learning with the team at the next staff meeting or via a written update

CQC inspectors understand that errors occur. What they assess is whether errors are recorded honestly, responded to properly, and used as learning. A service that covers up errors is far more concerning to an inspector than one that records them and acts on them.