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The weight-management pens prescribed through Hi-Doctor are all subcutaneous injections — they go into the fatty layer just under the skin. The same three sites apply to all of them, and the same rule about needles applies to all of them.
The patient information leaflet packed with your own pen, and your doctor’s instructions, override this page. Presentations differ, and so do their handling instructions.

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The three sites

Abdomen

The soft area either side of the navel.

Thigh

The front and outer part of the upper leg.

Upper arm

The outer back of the upper arm.
Every one of the pens — Wegovy, Mounjaro, Saxenda and Ozempic — uses the abdomen, thigh or upper arm.

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Rotate

Rotate between abdomen, thigh or upper arm each week. Rotating spreads the repeated needle punctures across different skin rather than concentrating them in one patch. Within a site, move to a slightly different spot rather than reusing the exact same point. Keep away from skin that is bruised, tender, broken or scarred.

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Not into a vein, not into muscle

These medicines are injected just under the skin. Do not inject into a vein or into muscle. If a site has very little fat, gently pinching a fold of skin before the needle goes in helps keep the injection in the right layer. Clean the area with an alcohol swab and let it dry before injecting. A wet swab stings.

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One needle, one injection

A needle has a short, fixed life, and it runs in this order every time.
1

Attach a new needle every time

Needles are single-use. A reused needle is blunter, dirtier and more likely to hurt.
2

Remove the needle after each injection

Do not leave a needle attached to a stored pen.
3

Drop it into a sharps container

A rigid, puncture-proof sharps container — not a household bin, not a plastic bottle, not a food container.
4

Never reuse or share

Needles are never reused. Pens are never shared between people.
Your pharmacy can tell you how full sharps containers are collected or returned where you live; the arrangement differs by country. See where Hi-Doctor operates.

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Handling the pen itself

  • Do not shake the pen.
  • Check the liquid before injecting. If it does not look the way your leaflet describes, do not use that pen.
  • Store unused pens in the refrigerator (2–8°C). Once opened, keep at room temperature below 30°C for up to 30 days. Do not freeze. Keep away from direct heat and light. This is the storage rule published for Wegovy, Mounjaro and Saxenda — check your own leaflet for the pen in your hand.
Knowing how long a pen lasts matters for planning. If a pen will run out before your next prescription, raise it in your account chat early rather than stretching doses.

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When something goes wrong at the site

Tell the medical team through your message thread if a site becomes persistently red, swollen, painful or lumpy, or if you see signs of an allergic reaction such as rash, itching or swelling of the face or throat. Report a suspected side effect even if you are not sure the treatment caused it — see Safety. Related: what to expect in the first month · missed or late doses · how Hi-Doctor works

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Start a consultation

Weight-loss consultation

Answer the weight-loss questionnaire and a registered doctor reviews it. They decide whether treatment is appropriate, which one, and at what dose — and declining is a normal outcome. See what it costs and how the review works.
This page is reference information, not medical advice and not a prescription. Whether a medicine is appropriate for you is decided by a registered doctor after reviewing your consultation.