Why do I feel nauseous or keep vomiting?

Both semaglutide and tirzepatide slow down how quickly your stomach empties. This is actually part of how they work — it helps you feel full longer — but the trade-off is that food and acid sit in your stomach longer than usual, which causes nausea and, in some people, vomiting. This effect is strongest when you first start the medication or go up to a higher dose, and it typically settles down over a few weeks.

Can this medication cause heartburn or acid reflux (GERD)?

Yes — GERD (heartburn / acid reflux) is reported in roughly 2–5% of people on semaglutide, dulaglutide, and liraglutide, and had a significant signal across all GLP-1 medications in pharmacovigilance data. About 1 in 5 people on GLP-1 therapy develop some degree of delayed stomach emptying, and semaglutide specifically carries a notably higher gastroparesis risk compared to other weight-loss approaches. If you already have reflux or a hiatal hernia, GLP-1 therapy can make it worse — let us know before starting.

Can reflux become serious — and when do we stop the medication?

In most people it's mild and manageable — but if vomiting is ongoing, repeated acid exposure can lead to reflux oesophagitis (inflammation of the oesophagus lining). Rare case reports have documented severe presentations requiring endoscopy. This is why we don't tell patients to just "push through." Our step approach: first, slow or pause dose escalation; if symptoms remain significant, consider a temporary hold or dose reduction. A PPI (like omeprazole) is our first-line prescription, with a mucoprotective agent added in stubborn cases. We also ask you to avoid stomach-irritating drugs concurrently — bisphosphonates (bone medications) and dabigatran (a blood thinner) in particular.

If GERD/oesophagitis is severe, or vomiting is refractory: we discontinue semaglutide. The good news is that symptoms and mucosal injury typically resolve after stopping. If you still want to stay on a GLP-1 medication, we can cautiously trial a switch to a different agent — individual tolerance varies, even though all GLP-1 therapies share a similar GI profile.

Why does food taste strange or metallic?

Dysgeusia (bad taste in the mouth) can feel metallic, salty, rancid, or even burning, and can start within a couple of weeks. Two things drive it: GLP-1 medications appear to alter taste receptor signalling directly, and slower stomach emptying causes bile and acid to reflux up, leaving a foul taste. It's more common with oral semaglutide (Rybelsus) than the injectable — if you're on Rybelsus, try taking it with hot water (46–52°C), which reduces bitterness without affecting how the drug works.

What we look for first: Before assuming it's just the medication, we check for contributing factors — uncontrolled acid reflux (treating GERD often improves the taste), oral thrush (candidiasis), dry mouth (xerostomia), and other medications you may be on (such as metformin, which can independently affect taste). Acidic and spicy foods often worsen dysgeusia, so dietary adjustments help. Good oral hygiene, saliva-stimulating measures (sugar-free gum, mints, staying hydrated) are the everyday backbone of management. If taste changes are troublesome and persistent despite addressing GERD and other contributing factors, we discuss dose reduction or switching to a different GLP-1 — weighing that against your glycemic and weight-loss benefits, keeping in mind that dysgeusia on its own is generally rare and often resolves.

Will these side effects go away on their own?

For most people — yes. GI side effects peak when you first start or go up to a new dose, then typically settle over a few weeks. Taste changes usually improve as your body adapts, though for some they persist throughout treatment. Slower dose escalation is the single most effective prevention. Never rush up to the next dose while symptoms are still active. If things aren't improving after 4–6 weeks at a stable dose, let us know — we have options beyond just waiting.

What can I do at home for heartburn and nausea?

Lifestyle habits that make the biggest difference: eat smaller, low-fat meals; avoid eating in the 2–3 hours before lying down; don't eat late at night; elevate the head of your bed slightly; stay upright after meals. For heartburn, an H2 blocker (like famotidine/Pepcid) gives quick relief. If that's not enough, talk to us about a PPI (like omeprazole) — it's our first-line prescription. Never increase your medication dose while GI symptoms are still active.

Anything I should avoid that makes this worse?

Yes — a few things can add insult to injury when the stomach is already irritated: carbonated drinks, alcohol, caffeine, fatty or spicy meals, and late-night eating all make reflux worse. Importantly, certain medications also irritate the stomach lining and should be avoided or discussed with us if you're on them — especially bisphosphonates (e.g., alendronate for osteoporosis) and dabigatran (a blood thinner). These are not necessarily stopped, but the timing and combination need to be reviewed.