Managing GLP-1 Side Effects

Nausea

The most common side effect by a distance, and the most manageable. It typically peaks 24–72 hours after a dose increase, then settles as your body adapts. Roughly 44% of semaglutide trial participants reported it at some point; the majority described it as mild.

What helps

• Smaller meals, more often. Five small meals sit far better than three normal ones.
• Bland and dry beats rich and wet. Crackers, toast, rice, plain chicken. Very greasy or fried food is the most reliable trigger.
• Ginger and peppermint. Ginger tea or chews have real evidence behind them for nausea and cost almost nothing.
• Stay upright for 30 minutes after eating. Lying down slows emptying further.
• Move the injection to the evening. If nausea peaks the next morning, you sleep through the worst of it.
• Cold food over hot. Less aroma, less nausea. Yoghurt, smoothies and cold chicken are easier than a hot roast on a bad day.

Constipation

The second most common, and the one most people are least prepared for. Slower gut motility plus less food plus less water is a straightforward equation.

• Water first. Aim for 64–80 oz a day. This alone fixes it for many people.
• Fibre, gradually. 25–30g daily from vegetables, beans, berries, oats — or a supplement. Increase it over a week rather than all at once, or you trade one problem for bloating.
• Magnesium citrate. Widely used, inexpensive, effective. Ask your provider about dose.
• Walk. Ten or fifteen minutes after meals does more for gut motility than it sounds like it should.
• A stool softener if needed — a reasonable question for your provider rather than something to suffer around.

Sulphur burps

Unpleasant, alarming the first time, and harmless. Food sitting longer in a slow stomach ferments slightly. Most people find it goes away when they cut back on high-fat and high-sulphur foods — eggs, red meat, cruciferous vegetables — for a few days, eat smaller portions, and skip carbonated drinks. If it persists alongside pain or vomiting, that is worth a call.

Reflux and heartburn

• Do not lie down within two or three hours of eating.
• Raise the head of the bed a few inches if it is worst at night.
• Smaller evening meals; earlier evening meals.
• Skip alcohol, coffee, tomato and very spicy food while it is active.
• If it is frequent, ask about an acid reducer rather than living with it.

Fatigue

Usually not the medication itself. It is nearly always one of three things: eating too little, drinking too little, or not enough protein. All three are easy to under-notice when appetite drops away.

• Check your actual intake for three days. Many people on a GLP-1 drift well below 1,200 calories without realising, which is too low to function on.
• Protein at every meal. 25–35g. See Eating Well on a GLP-1.
• Electrolytes, not just water — sodium, potassium, magnesium.
• If it persists, ask about bloodwork. Iron, B12 and thyroid are all worth ruling out rather than assuming.

Hair thinning

This one worries people, so here is the honest version: it is caused by rapid weight loss, not by the medication. It is called telogen effluvium, it typically appears three to four months in, and it is temporary — hair returns as weight stabilises. Adequate protein, iron and a slower rate of loss all reduce it. It is a reason to check your protein intake, not a reason to stop treatment.

Injection-site reactions

A small red bump, mild itching or slight bruising is common and settles within a day or two. Rotate sites weekly, let the alcohol dry fully before injecting, and let the medication warm slightly first. Spreading redness, warmth or pus is different — call someone.

When to contact someone straight away

These are uncommon. They are also the reason your prescriber screens your history before writing anything, and the reason a real prescriber matters — a point made at length in How Telehealth Weight Loss Actually Works.

Common questions