Details up front: dizziness · orforglipron · SURPASS-3.
I can parse the result. I am less sure what it licenses me to conclude.
I have deliberately not looked at anyone else’s interpretation yet.
What is the correct interpretation, and what is the common misreading?
Worth being precise here: timing is the most useful diagnostic feature here and it is the one most often omitted from the question.
Injection-site reactions are more often diluent-related than peptide-related. Benzyl alcohol sensitivity is uncommon but real, and it presents as a consistent local reaction at every site with a preserved diluent and no reaction with an unpreserved one — which is a straightforward thing to establish. Injection depth is the other common cause: intradermal placement stings and welts, subcutaneous placement usually does not.
| Feature | Local reaction | Sterile abscess | Cellulitis |
|---|---|---|---|
| Onset | Hours to 2 days | Days | 1–4 days, progressive |
| Warmth | Absent or minimal | Mild | Marked |
| Expansion | Static or shrinking | Slow | Expanding |
| Texture | Firm, flat or raised | Fluctuant | Diffuse, indurated |
| Systemic features | None | None | Fever, malaise possible |
| Action | Observe, rotate site | Clinical review | Same-day clinical review |
Vomiting matters mostly through its consequences. Loss of gastric fluid depletes sodium, chloride and potassium, and hypokalaemia presents as exactly the fatigue and cramping people attribute to the drug. Persistent vomiting also makes a renal panel uninterpretable, because a pre-renal picture looks like renal impairment.
The prescribing information for each agent lists adverse reaction frequencies against placebo in a table, and reading that table is more informative than reading a hundred anecdotes, because it has a denominator.
A symptom diary with dates against dose steps answers most of these questions without anyone needing to guess.
Aggregated, published test results and vendor ratings built from submitted batches. Methodology stated, dataset browsable, no listing fees.
Browse resultsTo be exact about it, the distinction worth making early is between a tolerability problem, which is unpleasant and self-limiting, and a clinical problem, which is neither. They present differently and the thresholds for each are worth writing down before you need them.
Pancreatitis red flags worth memorising rather than looking up: severe, persistent epigastric pain radiating to the back, worse lying flat and better sitting forward, with nausea and vomiting that does not settle. That combination is an urgent assessment, not a dose adjustment. An isolated lipase elevation without that picture is common and usually not pancreatitis.
Put another way, early satiety is not a side effect; it is the mechanism being observable. The useful distinction is between satiety, where you stop eating without distress, and aversion, where the thought of food is unpleasant. The first is the intended effect. The second frequently precedes the dose being too high or escalated too fast.
SURMOUNT-1 reported gastrointestinal events as the most frequent adverse events, mostly mild to moderate and mostly during escalation, with discontinuation for adverse events in the single digits per cent[1].
The caveat that actually matters: this is pattern recognition from published data, not a clinical assessment of you. Anything severe, persistent or accompanied by systemic features belongs with a clinician the same day.
Most of this resolves. The point of knowing the pattern is to recognise the small fraction that does not.
It helps to be literal here: look at the placebo arm before concluding anything about attribution. The placebo-arm rates for most of these events are not small, because the events themselves are common in the underlying population.
Fatigue attribution is a subtraction problem. Take out the energy deficit, the dehydration, the electrolyte shortfall and the poor sleep, and what remains attributable to the drug in the trials was modest — placebo-arm fatigue rates were within a few points of active-arm rates in most of the programme. The corollary is that the fixable causes are usually the actual causes.
Distinguishing an injection-site nodule from an infection: a nodule is firm, non-tender or mildly tender, not warm, not expanding, and appears within a day or two. Cellulitis is warm, tender, expanding, and often accompanied by systemic features. A sterile abscess sits between the two and is fluctuant. Warmth plus expansion plus fever is the combination that stops being a forum question.
The pooled gastrointestinal adverse-event rates across the STEP programme and the SURMOUNT programme are reported in the primary publications and in the FDA and EMA assessment reports, and the assessment reports are more useful because they give the placebo-arm rates alongside the active-arm rates in the same table.
The limitation of the timing heuristic is that it works well for common events and poorly for rare ones, which are precisely the ones that matter most.
If the timing does not fit the escalation, look for another explanation before settling on the drug.
edited 17 Feb 2026 by rota_site — expanded the table to cover the lower concentration
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