The first few weeks of Wegovy can feel unfamiliar: a weekly injection, a changing appetite and a dose that increases gradually rather than overnight. Knowing how to use Wegovy properly helps make treatment feel manageable, protects your safety and gives you the best chance of building results that last.
Wegovy is a prescription medicine containing semaglutide. It is used alongside a reduced-calorie eating plan and increased physical activity for eligible adults living with obesity, or overweight with weight-related health conditions. It is not a quick fix, and it is not intended to replace food, movement or ongoing clinical support. Think of it as one part of a considered weight-management plan.
How to use Wegovy: the weekly routine
Wegovy is injected once a week, on the same day each week where possible. You can inject it at any time of day, with or without food and drink. Choosing a time that fits your real routine – such as Sunday evening or before work on Friday – can make it easier to remember.
Your prescriber will usually start you on a low dose and increase it gradually. This is called dose escalation. It gives your body time to adjust and can reduce common stomach-related side effects such as nausea, diarrhoea, constipation or vomiting.
A typical schedule starts at 0.25 mg once weekly for four weeks, then rises every four weeks through 0.5 mg, 1 mg and 1.7 mg before reaching the usual maintenance dose of 2.4 mg. Your clinician may advise you to stay on a lower dose for longer if side effects are difficult to manage. Do not increase your dose early, take extra medicine or change the plan without clinical advice.
Your pen and prescription directions are the final word. Different pen presentations and treatment plans can vary, so always follow the instructions supplied with your medication and those from your prescribing team.
Preparing for your injection
Before injecting, check that you have the correct Wegovy pen and strength for your current treatment week. Look at the medicine through the pen window. It should be clear and colourless. Do not use it if it looks cloudy, coloured, frozen or contains particles.
Wash and dry your hands, then use a new needle each time. Never share your pen or needles with anyone else, even if the needle has been changed. Sharing can spread infection and means doses cannot be safely controlled.
Wegovy is injected under the skin, not into a muscle or vein. Suitable sites are the stomach area, the front of the thigh or the upper arm. If someone else is administering the injection, they may use the upper arm. Rotate the injection site each week rather than repeatedly using exactly the same spot. Avoid skin that is sore, bruised, hard, scarred, irritated or affected by a rash.
Giving the injection
The precise steps depend on the pen you have been supplied, so read the patient information leaflet before your first dose. In general, you will attach a new needle, prepare the pen as instructed, select the prescribed dose and press the needle into the skin at the chosen site. Hold the injection button down until the dose has been delivered, following the timing guidance for your pen.
Once finished, carefully remove the needle and place it in a suitable sharps container. Do not throw loose needles into household rubbish or recycling. Put the pen cap back on after use, but do not store the pen with a needle attached.
If injections make you anxious, take your time. Sit down, breathe normally and choose a quiet moment when you are not rushing out of the door. Many people find the needle is much less uncomfortable than expected. If you are unsure about technique, contact your clinical team before using the pen rather than guessing.
What to do if you miss a Wegovy dose
Missed doses happen. If you remember within five days of your scheduled injection day, take the dose as soon as you remember. If more than five days have passed, skip that dose and inject your next dose on your usual scheduled day.
Do not take two doses close together to make up for a missed injection. There should be at least 72 hours between Wegovy doses. If you miss more than one dose, or have had a break from treatment, speak to your prescriber before restarting. You may need to restart at a lower dose to reduce the risk of side effects.
If you want to change your regular injection day, this can usually be done as long as there are at least 72 hours between doses. Confirm the best approach with your clinician if you are not certain.
Managing side effects without losing momentum
Nausea, diarrhoea, constipation, stomach pain, headache, tiredness and vomiting are among the more common side effects, particularly after starting Wegovy or moving up a dose. They often improve as your body adjusts, but you should not feel you have to simply put up with severe or persistent symptoms.
Smaller meals can be easier to tolerate than large portions. Eat slowly, stop when you feel comfortably full and avoid very rich, greasy or spicy meals if they make nausea worse. Keep drinking regularly, especially if you have diarrhoea or are being sick. Dehydration can make you feel significantly unwell.
It also helps to be realistic about appetite changes. Wegovy may make it easier to feel full sooner and think less about food, but you still need enough protein, fibre, fluids and nourishing meals. Very low food intake can leave you fatigued and makes it harder to maintain healthy habits over time.
Contact your prescriber if side effects are troubling, last longer than expected or stop you from eating or drinking adequately. A slower dose increase may be appropriate. At Online UK Pharmacy, treatment is clinician-reviewed, so you can raise concerns with a real clinical team rather than trying to navigate a medication change alone.
When to get urgent medical advice
Stop using Wegovy and seek urgent medical help if you develop severe, persistent stomach pain, especially if it reaches through to your back, with or without vomiting. This may be a sign of pancreatitis.
Get urgent advice for symptoms of a serious allergic reaction, such as swelling of the face, lips, tongue or throat, breathing difficulty, severe rash or faintness. You should also seek prompt medical assessment for signs that may suggest gallbladder problems, including pain in the upper right side of the stomach, fever, yellowing of the skin or eyes, or pale stools.
Low blood sugar is more likely if you use Wegovy alongside insulin or certain diabetes medicines such as sulphonylureas. Shaking, sweating, dizziness, confusion, hunger or a racing heartbeat can be signs of low blood sugar. Your diabetes treatment may need adjustment, so make sure the clinician prescribing Wegovy knows about every medicine you take.
Tell your prescriber about any history of pancreatitis, diabetic eye disease, kidney problems or gallbladder disease. Wegovy is not suitable during pregnancy or while trying to conceive. If pregnancy is planned, it should usually be stopped at least two months beforehand. Discuss contraception, pregnancy plans or breastfeeding with your clinician before treatment.
Storing Wegovy correctly
Before first use, store Wegovy in a refrigerator between 2°C and 8°C. Keep it away from the cooling element, do not freeze it and keep the cap on to protect it from light. Check the packaging and leaflet for the storage instructions specific to your pen.
Once in use, a Wegovy FlexTouch pen can usually be kept for up to six weeks in a refrigerator or below 30°C, with the cap on. Do not leave it in direct sunlight, a hot car or near a radiator. If you are travelling, plan ahead and use an insulated medication bag where appropriate, but avoid placing the pen directly against ice packs as freezing can damage it.
Keep the medicine out of the sight and reach of children. Do not use it after the expiry date or beyond its permitted in-use period, even if medicine remains in the pen.
Make Wegovy work around your life
The people who tend to get the most from treatment are not necessarily those who follow a perfect plan. They are the ones who create a routine they can repeat: a weekly reminder, regular meals that suit their household, practical movement and honest check-ins when something is not working.
Your weight may fluctuate from week to week, and progress is rarely a straight line. Focus on the broader changes too: reduced cravings, feeling full with less food, more energy for a walk, or being able to make choices without constant food noise. Keep your clinician informed, use the dose prescribed for you and give yourself the same patience you would offer anyone else starting a new treatment.
