Medication Administration Rights, MAR, Dose Calculations & Online Tutoring

Medication administration is the safe giving of prescribed medicines to patients. It includes checking the prescription and patient, calculating and preparing the dose, giving it by the correct route and technique, recording it on the medication administration record and monitoring the patient afterwards for the expected effect and any adverse reactions.

The original five rights cover patient, drug, dose, route and time. Organisations and textbooks later added documentation, reason, response, the right to refuse and education to address common causes of error. The numbers differ by source, so use the list your course teaches, remembering they are a minimum check.

A medication administration record, or MAR, is the chart, paper or electronic, on which every dose given, withheld or refused is recorded with the time and the signature of the person responsible. It is a legal document, used to prevent missed or duplicated doses and to show what a patient has received.

Check the prescription is complete and valid, the patient's identity against the wristband and chart, allergies, the drug name, strength and expiry, the dose calculation, the route and the timing. Also check any observations needed first, such as pulse, blood pressure or blood glucose, and that the patient consents.

It is the standard dosage formula: divide the dose prescribed by the strength you have, then multiply by the volume or number of units it comes in. For 75 milligrams from a vial of 100 milligrams in 2 millilitres, the answer is 1.5 millilitres. Always convert units before dividing.

Divide micrograms by 1,000 to get milligrams, and multiply milligrams by 1,000 to get micrograms. So 125 micrograms equals 0.125 milligrams. Many medication errors come from mixing these units, so many organisations ask staff to write micrograms in full rather than using abbreviations that are easily misread.

Standard U-100 insulin contains 100 units in each millilitre, so 24 units is 0.24 millilitres. In practice insulin is never measured in millilitres with an ordinary syringe: it is drawn up with an insulin syringe or given with a pen that is marked in units, which reduces the risk of a tenfold error.

A percentage strength means grams per 100 millilitres, so a 1% solution contains 10 milligrams per millilitre. A ratio strength of 1 in 1,000 means 1 gram in 1,000 millilitres, which is 1 milligram per millilitre. Converting both to milligrams per millilitre makes the dose calculation straightforward.

The ventrogluteal site is widely recommended for adults because it has thick muscle and lies away from major nerves and blood vessels. The deltoid is used for small volumes such as vaccines, and the vastus lateralis is another option. The dorsogluteal site is generally avoided because of the risk to the sciatic nerve.

Intramuscular injections are usually given at 90 degrees to the skin, subcutaneous injections at 45 to 90 degrees depending on the needle length and the amount of fatty tissue, and intradermal injections at a shallow angle of about 10 to 15 degrees so that a small bleb forms just under the skin.

In the Z-track technique the skin and fat over the injection site are pulled firmly to one side before the needle goes in, held during the injection and released after the needle is withdrawn. This creates a zigzag track that seals the medicine in the muscle and reduces leakage and skin irritation.

Controlled drugs such as strong opioids are kept in a locked cupboard and every dose is recorded in a controlled drug register. Administration is usually checked by two people, who confirm the patient, drug, dose and remaining stock balance, and both sign the register in line with local policy.

Make the patient safe first by checking them and their observations, then tell the nurse in charge and the prescriber and follow their instructions. Document the facts, report through the local incident system and be open with the patient. Reporting helps organisations learn and change systems to prevent repeats.

Only when a pharmacist or the prescriber confirms it is safe. Modified-release, enteric-coated and some hazardous medicines must not be crushed or opened, because this can cause overdose, loss of effect or harm to staff. If a patient cannot swallow, ask whether a liquid or another route is available.

Yes. A tutor can work through dosage calculations with mixed units, explain the rights and checks, and help you write care plans, reflections and medicines-management essays using fictional cases. This is educational support only, not clinical advice, and you complete your own assessed work in line with your university's academic rules.