How to Prepare for Wegovy: What to Decide Before Your First Pen

What to sort out with your prescriber before the first injection

The most consequential preparation happens before the pen arrives. A thorough medication review is the starting point. If you take oral contraceptives, NHS guidance notes there is no established evidence that semaglutide reduces pill absorption the way tirzepatide can, but your prescriber will still want to factor in your full contraception picture, particularly if you are considering pregnancy soon. The switch from Saxenda to Wegovy also requires a clinical conversation about timing and any wash-out period.

Tell your prescriber about every medicine you take, including supplements and over-the-counter products. GLP-1 medicines slow gastric emptying, which can alter how quickly other drugs are absorbed. This is not a reason to avoid Wegovy, but it is a reason to have the conversation first rather than after something unexpected happens.

If you have a surgical procedure planned, your anaesthetist needs to know you are starting a GLP-1 medicine. NHS England advises patients to flag this proactively, because the effect on gastric emptying is relevant to anaesthetic safety. Building this into your preparation, rather than mentioning it the morning of your operation, matters. The most common pre-start questions our prescribers answer are largely about this medication-review step.

Fridge space, needle habits and the routine that makes weekly injections easy

Wegovy pens are stored in a refrigerator at 2–8°C. One practical checking habit worth building before your first delivery arrives: open your fridge door right now and identify a shelf or drawer that stays consistently cold, away from the freezer compartment and the door itself (where temperatures fluctuate). That ten-second check, done once, removes a surprisingly common source of early anxiety.

The injection itself is subcutaneous, meaning into the fatty layer just under the skin, at sites including the abdomen, thigh or upper arm. Rotating sites each week reduces localised reactions. Most people find the pen straightforward, but reading the step-by-step instructions in the Patient Information Leaflet once before the first dose is far better than reading them with a pen in hand. The timeline for Wegovy's effects is worth understanding too, because the first two or three weeks often feel subtle while your body adjusts to the starting dose.

Once-weekly means picking a consistent day. Many people choose a weekday so that if a question arises they can contact a clinical team easily. Our aftercare team is available seven days a week, but the principle of injecting on a predictable, low-pressure day is sound.

What to eat in the first two weeks, and why it actually matters here

Wegovy's most common side effects are gastrointestinal: nausea, loose stools, constipation, reflux and fatigue. They are generally mild to moderate and most noticeable in the days immediately after starting or increasing a dose. They are not inevitable in their worst form, and preparation genuinely modulates them.

The practical approach, supported by NHS guidance on semaglutide's side-effect profile, is to start with small, lower-fat meals, eat slowly, avoid alcohol in the early weeks, and keep well hydrated. Fatty or very rich meals amplify nausea. This is not about following a rigid plan; it is about giving your digestive system the easiest possible introduction to the medicine. High-protein foods alongside adequate fibre help maintain muscle and keep energy steady as appetite falls. A conversation with a dietitian, while not mandatory, is worth arranging if you have specific dietary needs.

One point that often surprises people: the appetite reduction from Wegovy can mean you genuinely forget to eat enough protein. Thinking this through before your appetite changes, rather than after, is more useful than any post-hoc adjustment. The weeks it typically takes to notice meaningful changes gives useful context for pacing expectations.

Understanding the NHS versus private route before you start

Wegovy is recommended by NICE for weight management within specialist services under TA875, but NHS waiting lists are commonly long and eligibility thresholds are strict. Many people who meet the licensed prescribing criteria choose the private route simply to avoid an open-ended wait. If you are exploring what private treatment involves, the treatment options at nume cover the consultation process, what the prescriber reviews, and what is included in the price. It is also worth reading about how Wegovy compares to Saxenda if you are deciding between GLP-1 injectable options, or the difference between Wegovy and Ozempic if that question has come up, because they are different products with different UK licences.

A note on cost: private Wegovy pricing varies by dose and provider, and any legitimate price should include the prescription and clinical assessment. If you want to understand what that looks like in practice, the cost and access context for Wegovy sets out the landscape honestly. The right preparation for Wegovy also includes knowing who will support you clinically once you have started. Aftercare matters as much as the first pen.