Common side effects and how doctors help you manage them.

What most people actually feel

GLP-1 medication works partly by slowing how quickly your stomach empties and by dialling down appetite signals in the brain. That is why the common side effects show up in the gut. Most are mild to moderate, and most ease over a few weeks as your body adjusts.

The ones people report most often include:

• Nausea, usually strongest in the first days after a dose increase
• Constipation or, for some people, looser stools
• Burping, reflux or a feeling of fullness that lasts longer than usual after eating
• Mild fatigue or headache in the early weeks

Results and side effects both vary from person to person. Some people feel very little. Others need more time and a slower plan. Neither is a sign you are doing it wrong.

Why doctors start low and go slow

You do not begin on the full dose. A doctor starts you on a small amount and steps it up gradually over weeks or months. This is often called start-low-go-slow, and it is the single most useful tool for keeping side effects manageable.

The logic is simple. Your gut tolerates a small change far better than a big one. By raising the dose in stages, your doctor gives your stomach time to adjust at each step. If nausea flares when you move up, they can hold you at the current dose for longer, or step back down, before trying again. There is no prize for rushing.

Everyday habits that help

Small changes to how you eat make a real difference to how you feel:

• Eat smaller portions and stop when you feel full, because that full feeling now arrives sooner
• Go easy on very fatty, fried or heavily spiced meals while your body settles
• Sip water through the day, which also helps with constipation
• Add fibre from vegetables, fruit and whole grains, and keep moving

These are general habits, not a fixed rule. Your doctor may suggest others that suit you.

When to contact your doctor

Mild nausea that fades is expected. Some signs are worth a call or a visit rather than waiting them out. Contact your doctor if you have:

• Vomiting or diarrhoea that will not settle, or that leaves you unable to keep fluids down
• Severe stomach pain, especially pain that spreads to your back
• Signs of dehydration, such as dizziness, very little urine or a dry mouth
• Any symptom that worries you, even if it is not on this list

Doctor-led treatment exists for exactly this reason. Your doctor can adjust your dose, treat a symptom directly, check for anything less common, or pause treatment if needed. You are not meant to manage the hard parts on your own, and you should never change your own dose without speaking to them first.

What a doctor can adjust

If side effects are getting in the way, a registered doctor has room to work. They might hold your dose steady for longer, slow the rate you step up, review your other medicines, or suggest something to settle nausea in the short term. The plan is meant to bend to your body, not the other way around.

The full picture

For most people the early gut effects are a passing phase rather than a permanent state, and they fade as the dose settles. A minority find the side effects too much and decide, with their doctor, that this class of treatment is not the right fit. Both outcomes are normal. What matters is that the decision is made with a HPCSA-registered doctor who knows your history, using a SAHPRA-registered medicine, rather than guessed at alone.

This is general information and not medical advice. A registered doctor decides what suits you as an individual, based on your health, your history and your goals.

Wondering whether this treatment could be an option for you? Eligibility usually starts at a BMI of 30 or more, or 27 or more alongside a weight-related condition such as type 2 diabetes, high blood pressure, high cholesterol, sleep apnoea or fatty liver. A short assessment with one of our doctors is the way to find out.