Fatigue in the first months

The under-discussed one

Nausea gets the headlines. Fatigue gets a shrug, and then it turns out to be the thing that made someone’s month three genuinely bleak.

Kiki holds our sleep-and-fatigue circle and reckons the reason it goes undiscussed is that it is hard to describe and impossible to prove. There is no measurement. You simply cannot get up the stairs with your usual momentum, or you fall asleep at eight in the evening, or you get to Wednesday afternoon and everything is made of wet sand.

It is also poorly characterised in the published evidence, which is a real gap. Fatigue appears in the adverse-event tables of the major trials at low rates and is not a headline finding in STEP 1 (Wilding, NEJM, 2021) or SURMOUNT-1 (Jastreboff, NEJM, 2022). Meanwhile it is one of the top three things members raise in the first twelve weeks. Either it is being under-reported in trials or something about real-world use differs from trial conditions. Nobody knows which, and we would rather say so than invent a percentage.

The likely causes, in the order worth checking

Most early fatigue in this community turns out to be one of a small number of things, and several are fixable.

• Not enough fluid. The commonest and the dullest. Thirst signalling drops along with appetite, and mild dehydration feels exactly like tiredness. See hydration and electrolytes.
• Eating much less than your body is running on. A sharp drop in intake produces tiredness, and if it is combined with very little protein it produces weakness too.
• Disturbed sleep you have not noticed. Reflux, needing the bathroom, or waking with nausea. Members frequently discover the fatigue was a sleep problem wearing a disguise.
• The days after a dose. A great many members have two predictably flat days each week. Writing that down is what turns it from a mystery into a pattern.
• Something that was already there. Iron deficiency, low B12, an underactive thyroid, poorly controlled glucose, sleep apnoea, depression. These do not pause because you started a new medicine, and starting one is a good moment to have them looked at.
• Electrolytes, if you have had a spell of vomiting or diarrhoea. Worth mentioning to a clinician rather than self-managing.

Kiki’s ordering is deliberate: fix the fluid and the sleep first, because they are free and quick, then get the blood tests, then start wondering about the drug itself.

What to ask for, and when

Fatigue is the symptom clinicians are most likely to wave through, so it helps to arrive with something specific.

Useful framing: "I have been flat for six weeks, it is worse on the two days after my injection, I am sleeping eight hours and waking unrefreshed, and I would like to rule out the boring causes." That sentence tends to produce a blood form. "I am tired" tends not to.

The tests members are commonly offered are a full blood count, ferritin, B12 and folate, thyroid function, kidney function and electrolytes, and glucose or A1c. Whether any of them are indicated is a clinical judgement and depends on you — we are describing what has happened, not recommending a panel. Reading your bloodwork without panic is for afterwards, and bloodwork-buddies is where members bring the printout.

Ask sooner rather than later if the tiredness came with breathlessness, palpitations, dizziness on standing, or a level of exhaustion that is not like anything you have had before. Sudden or severe fatigue is different from the gradual flatness this guide is mostly about, and it belongs in front of a clinician rather than in a forum.

What members did to get through it

None of this is treatment. It is the collected practice of people who had to keep working.

• Protect two things a week rather than everything. Ren’s over-60 circle produced the eight-minutes-and-a-chair idea and it has spread across the whole community: a tiny amount of movement kept alive through a bad month beats a good programme abandoned. There is a guide for it.
• Move the injection to suit the week. Members with predictable flat days shifted their dose so those days landed on a weekend, or on days off. Ask your prescriber before changing the day.
• Eat something on the flat days even though nothing appeals. Under-eating deepens fatigue and this is the loop most worth interrupting. This guide is written for exactly that.
• Front-load the week. Several members reorganised the demanding parts of their job or their household round the two good days.
• Tell one person. Fatigue is invisible and makes people seem unreliable. Members who explained it to a manager or a partner report it removed a whole layer of stress.
• Stop auditing yourself. Ada’s contribution: the exhaustion is worse when you spend the flat days interrogating whether you are allowed to be tired.

Shift work makes all of this different

Kiki holds shift-workers and the honest position there is that the standard advice does not fit.

If your baseline is already tired, you cannot tell what the medicine is doing. If your meals happen at four in the morning in a staff room, the eating advice written for people who have dinner at seven is useless. If your week rotates, injection day drifts and so does the pattern of difficult days.

What that circle has settled on: anchor the injection to a calendar day rather than to a shift pattern, and accept that the difficult days will sometimes land badly. Keep the two-line note anyway, because over a couple of months a pattern emerges even from a chaotic rota. And be sceptical of your own conclusions in a bad week — several members have blamed the drug for what turned out to be four night shifts in a row. Sleep and shift work goes further into it.

When it does not lift

For most members, early fatigue improves — often as intake settles and the dose stops moving, frequently by the third or fourth month. For some it does not, and that deserves to be taken seriously rather than absorbed.

Persistent unexplained fatigue with normal bloods is a real clinical situation with real causes, and being on a GLP-1 does not mean the answer is the GLP-1. Members with long covid in particular have had to disentangle two overlapping fatigues, and our long-covid-and-fatigue circle exists because that is genuinely hard to do alone.

If the tiredness is the thing making treatment unlivable, that is worth saying out loud to a prescriber in exactly those words. Some members went slower, some changed drug, some stopped for a while and restarted. Sara in Oslo came off once and came back kinder to herself, and describes the break as the reason she is still here.