If you have been prescribed Wegovy or are considering it as part of your weight management journey, understanding what to expect can make a real difference to how you feel during treatment. Like any medication, Wegovy can cause side effects, and knowing about them in advance means you are better prepared to manage them and stay on track with your plan.

At Shivas Pharmacy, we support patients throughout their Wegovy treatment, from the first injection to ongoing check-ins along the way. If you have questions about starting or continuing Wegovy, contact us today or book an appointment with our team.

What Is Wegovy And How Does It Work?

Wegovy is a prescription-only weight loss injection containing semaglutide, a GLP-1 receptor agonist. It works by mimicking a hormone that regulates appetite, helping you feel fuller for longer and reducing overall calorie intake. It is used alongside a reduced-calorie diet and increased physical activity in adults with obesity or those who are overweight with at least one weight-related health condition.

Wegovy is not a quick fix, but for many people, it can be a meaningful tool in achieving and maintaining a healthier weight. Understanding how the medication works also helps explain why certain side effects occur, particularly in the early stages of treatment when your body is adjusting to the new dose. Make sure you are aware of its side effects, and consult our guide to determine whether weight-loss jabs are right for you.

Common Wegovy Side Effects

The majority of side effects reported with Wegovy are gastrointestinal. These tend to be most noticeable when you first start the medication or when your dose is increased. For most people, they ease off as the body adjusts over the first few weeks. You can read more about managing these on the NHS weight management injections page.

The most commonly reported side effects include:

■  Nausea	■  Vomiting	■  Diarrhoea
■  Constipation	■  Stomach pain or discomfort	■  Indigestion or bloating
■  Headaches	■  Fatigue	■  Dizziness

Nausea is the most frequently reported side effect, particularly in the first few weeks. Eating smaller meals, avoiding fatty or spicy foods, and staying well hydrated can all help reduce its intensity.

Wegovy Side Effects By Stage Of Treatment

Side effects can vary depending on where you are in your treatment. The dose-escalation schedule used with Wegovy is designed specifically to reduce the risk of side effects by starting low and gradually increasing over several months.

Stage	Weekly Dose	Common Side Effects At This Stage
Weeks 1 to 4	0.25mg	Mild nausea, reduced appetite, occasional headaches
Weeks 5 to 8	0.5mg	Nausea, diarrhoea, indigestion
Weeks 9 to 12	1mg	Nausea, vomiting, constipation or diarrhoea
Weeks 13 to 16	1.7mg	Stomach discomfort, fatigue, bloating
Week 17 onwards	2.4mg (maintenance)	Side effects typically settle; some may experience ongoing mild nausea

If you find side effects particularly difficult at any stage, speak to your pharmacist or prescriber before making any changes to your dosing schedule.

Tips For Managing Wegovy Side Effects Day To Day

Many of the most common side effects can be managed with practical adjustments to your routine. Small changes to how and when you eat can make a significant difference, especially in the early weeks of treatment.

Helpful strategies include:

• ✓  Eat smaller, more frequent meals rather than large ones
• ✓  Avoid high-fat, fried, or heavily spiced foods
• ✓  Stay well hydrated throughout the day
• ✓  Take your injection on the same day each week to build a routine
• ✓  Avoid lying down immediately after eating
• ✓  Reduce alcohol intake, which can worsen nausea and digestive discomfort
• ✓  Speak to your pharmacist if symptoms feel unmanageable or are affecting your quality of life

The key is not to give up too quickly. Many people find that the most difficult period is the first four to eight weeks, after which their body adjusts, and side effects reduce significantly.

Injection Site Reactions

Wegovy is administered as a subcutaneous injection, typically into the stomach, thigh, or upper arm. Some people experience mild reactions at the injection site, including redness, bruising, or itching. These are usually short-lived and resolve on their own.

To minimise injection site discomfort:

1. Rotate injection sites each week
2. Allow the pen to reach room temperature before injecting
3. Ensure the skin is clean and dry before use
4. Follow the technique shown by your healthcare provider

If you are new to self-injection and would like guidance on technique, our team at Shivas Pharmacy can walk you through the process with confidence. You can also check out our blog on how to use a mounjaro pen properly to learn more.

Less Common But Serious Side Effects To Be Aware Of

While most people experience only mild to moderate side effects, there are some less common reactions that are important to know about. These do not affect everyone, but being informed means you can act quickly if needed.

Seek medical attention if you experience any of the following:

• ⚠  Severe or persistent abdominal pain, which could indicate pancreatitis
• ⚠  Sudden changes in vision
• ⚠  Signs of a gallbladder problem, such as pain in the upper right abdomen, fever, or jaundice
• ⚠  A rapid or irregular heartbeat
• ⚠  Allergic reactions, including swelling, rash, or difficulty breathing
• ⚠  Signs of low blood sugar, particularly if you are also taking other diabetes medications

These serious side effects are uncommon, but they are worth understanding before you begin treatment. If you are unsure about any symptoms you are experiencing, our team at Shivas Pharmacy is here to help. Get in touch with us or book an appointment to speak with one of our pharmacists.

Who Should Take Extra Care With Wegovy?

Wegovy is not suitable for everyone, and certain individuals may be at higher risk of side effects or complications. Before starting treatment, it is important to discuss your full medical history with a qualified prescriber.

Extra caution is advised for people with:

1. A personal or family history of medullary thyroid carcinoma
2. Multiple endocrine neoplasia syndrome type 2
3. A history of pancreatitis
4. Severe gastrointestinal conditions
5. Kidney or liver problems
6. Pre-existing mental health conditions, such as mood changes, have occasionally been reported

A thorough consultation ensures that Wegovy is the right choice for you and that your treatment is properly monitored from the start.

How Shivas Pharmacy Supports Your Wegovy Journey

Starting a new medication is always easier when you have proper support. At Shivas Pharmacy, we provide more than just a prescription. Our team offers ongoing guidance, answers your questions as they arise, and helps you stay on track throughout your treatment.

Whether you are just beginning to explore Wegovy as an option or you are already partway through your treatment and finding certain side effects difficult to manage, we are here to help you navigate the process with confidence.

If you are looking for personalised weight management support in Surrey, contact us today and book your appointment with Shivas Pharmacy so we can support you every step of the way.

This blog was written on behalf of Shivas Pharmacy by Pharmacy Mentor.