This leaflet answers common questions about drinking preOp® before your surgical procedure. If you would like further information or have any worries, please do not hesitate to ask your nurse or doctor. In all cases, a pre-operative assessment nurse will explain when and how to take preOp® and answer any questions you may have.

What is preOp®?

It is a clear, non-carbonated, lemon flavoured, carbohydrate drink. It is gluten, lactose, fat, protein, and fibre free.

Why have I been given preOp® to drink?

You have been given preOp® to drink as part of your treatment prior to your surgery. Research has shown that taking carbohydrate drinks in this way reduces the stress caused on the body by surgery, improves wellbeing and may reduce muscle loss following surgery. Taking preOp® can also help to reduce the side effects of fasting before surgery such as nausea and vomiting after surgery.

When and how should I take preOp®?

You will need to take two doses of preOp® before your surgery as follows:

  1. Take your first dose the night before your surgery: four 200ml bottles/cartons.
  2. Take preOp® in addition to your normal evening meal. It may make you feel quite full as it provides additional calories and volume. You may wish to start drinking your first evening dose at 5pm and drink one each hour until you have had four. Try to take the full dose if you can, to get the full benefit of preOp®. Take your second dose on the morning of your surgery: two 200ml bottles/cartons.

Please note this second dose must be taken at least one hour before you are due to come into hospital. For example, if you are asked to come into hospital for 8am, you need to have finished your last bottle/carton by 7am. Make sure you allow yourself enough time in the morning to drink two bottles/cartons before you must be nil by mouth. preOp® is a clear fluid in terms of your pre-operative fasting instructions.

How should I store my preOp® drink?

preOp® is best served chilled and should be stored in a cool, dry place, (5-25°C). Once opened, it should be consumed within four hours, or stored in a refrigerator for 24 hours and any unused contents discarded thereafter.

Risks and side effects

It is gluten, lactose, fat, protein, and fibre free. If you experience any side effects or adverse reactions, discontinue use and seek medical assistance if necessary.

Do you have any further questions?

If you have any further questions, you may contact the pre-operative assessment unit on 020 7794 0500, extension 51605 or 51625.