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Medication guide

Semaglutide (Wegovy)

Supports weight management in eligible patients alongside nutrition and activity measures.

Check the name, strength and form on your own prescription or package.

Brand
Wegovy
Form
Wegovy weekly subcutaneous injection
Guidance checked
2026-09-08

About this medication

  • Wegovy (semaglutide) is an injectable medicine used together with a lower-calorie diet and more physical activity for long-term weight management in adults with obesity, or with excess weight plus a weight-related health problem.
  • It is also used to lower the risk of a heart attack in adults who already have heart disease and excess weight.
  • It is not the same product as the semaglutide used for diabetes (Ozempic) — do not use one in place of the other.

Supports weight management in eligible patients alongside nutrition and activity measures.

How to use it

  • Inject under the skin of your stomach, thigh, or upper arm once a week, on the same day each week, at any time, with or without food.
  • Your dose is increased slowly over several months, starting at 0.25 mg, up to the full dose of 2.4 mg once weekly — follow your prescriber's schedule exactly and do not skip the slow increase.
  • Rotate where you inject each week to avoid skin problems.

If you miss a dose

  • If you miss a dose and it has been 5 days or less since it was due, take it as soon as you remember. If more than 5 days have passed, skip the missed dose and take your next dose on your regular scheduled day.

The usual escalation uses separate four-week stages: 0.25, 0.5, 1 and 1.7 mg, then 2.4 mg from week 17. Tolerance may delay increases.

Pregnancy and breastfeeding

  • Do not use this medicine if you are pregnant. Stop it at least 2 months before you plan to become pregnant.
  • Breastfeeding is not recommended while using this medicine, since there is not enough information on whether it passes into breast milk.

Avoid pregnancy; stop at least two months before a planned pregnancy. Discuss breastfeeding.

Before you use it

  • Tell your prescriber if you or a family member has ever had medullary thyroid cancer, or a condition called multiple endocrine neoplasia syndrome type 2 (MEN 2) — this medicine must not be used in that situation.
  • Tell your prescriber if you have gallbladder disease, diabetic eye disease, kidney problems, or are pregnant, trying to become pregnant, or breastfeeding.

Important warnings

  • Get medical help right away for severe stomach pain that does not go away, especially if it spreads to your back, with or without vomiting — this can be a sign of pancreatitis.
  • Get medical help right away for pain in the upper right side of your stomach, yellowing of the skin or eyes, or fever with stomach pain — these can be signs of a gallbladder problem.
  • Get medical help right away for severe bloating, ongoing vomiting, or if you stop passing gas or having bowel movements — this can be a sign of a bowel blockage.

Avoid relevant allergy, medullary thyroid cancer history or MEN 2. Do not duplicate semaglutide products.

Possible side effects

  • Nausea, vomiting, diarrhea, and constipation. These are most common when starting or increasing your dose and usually ease with time.

Nausea, vomiting, diarrhoea and constipation.

When to get help

When to get emergency help

  • Severe or worsening stomach pain, especially with vomiting or pain spreading to your back.
  • Severe bloating, ongoing vomiting, or inability to pass gas or stool.
  • Signs of a severe allergic reaction: swelling of the face, lips, tongue, or throat; difficulty breathing; widespread rash or hives.

When to contact a healthcare professional

  • If you are not tolerating the nausea or other stomach side effects even after slowing down the dose increases.
  • If you have diabetes and notice new vision changes after starting this medicine.

Persistent severe abdominal pain, dehydration or severe vomiting requires assessment.

Other medicines and products

  • This medicine can slow how quickly your stomach empties, which may change how well other oral medicines work, including birth control pills — discuss all your other medicines with the Care365 care team.
  • If you also take insulin or a sulfonylurea diabetes medicine, your risk of low blood sugar may increase; your other diabetes medicine doses may need to be adjusted.

Insulin or sulfonylureas can increase hypoglycaemia risk; review all medicines.

Missed doses, storage and accidental exposure

  • Store new pens in the refrigerator. Do not freeze.
  • Check the specific pen's package instructions for how long it can be kept at room temperature once in use.
  • Dispose of used pens and needles in a sharps container, not the household trash.

Follow your own product’s missed-dose instructions. If you are unsure, ask the Care365 clinical team before taking an extra dose. Contraceptives, injections and modified-release medicines may need a specific plan.

Keep the original packaging and follow its storage, expiry and disposal instructions. Keep medicines away from children and pets. Ask about refrigeration, after-opening limits and safe sharps disposal when relevant.

For suspected overdose or accidental swallowing, contact poison control or urgent medical care promptly. Call emergency services for breathing difficulty, collapse or a seizure.

Key points to remember

  • This is a long-term treatment, not a short course — weight regain is expected if it is stopped.
  • This is a different product and dose than the semaglutide used for diabetes (Ozempic); do not interchange them.

These practical points come from the Pharmasist patient handout for the same product monograph cited by this guide.

References and product information

Sources checked .

Sources checked 2026-09-08. Safety sections are highlights; consult the full product information for complete warnings and instructions.

Check the Canadian Drug Product Database by product name or DIN for current product information.

This is a plain-language guide, not the complete monograph. Match the name, strength and form on your package before using product-specific directions.

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