Fatigue and Low Energy on Foundayo
Tiredness is one of the first things many people mention when they start Foundayo (orforglipron), the once-daily tablet authorised in the UK for weight management. Fatigue appears among the side effects listed in the UK product information, but the accounts people post in public forums say more about what it feels like day to day: how quickly it arrives, what it does to a working day, and whether it fades.
The experiences below are personal accounts, not evidence of how often fatigue happens or what causes it, and they vary as much as the people writing them.
What follows moves from the first days to the words people use for the feeling, how it reaches into work and motivation, the clock-watching, how long it lasts, the explanations people try, and the people whose energy holds steady.
The First Days
For some, the tiredness does not creep in so much as arrive, and it arrives fast.
"Within about an hour, I felt the fatigue kick in. I'm hydrating and eating (my appetite is normal)."
– WoundedChipmunk
For a second person the unit was days rather than hours, and the routine bent around it: naps every day, early nights.
"I’m on day 5 at .8 and the exhaustion is real. I’ve been taking naps every day and going to bed early"
– SaintSexburga
Whether either of them would call it fatigue is a different question, because people reach for quite different words.
Tired, Exhausted or Something Else
One person, six days in, had already crossed several likely explanations off the list and was still unsure which word fitted.
"Holy hell. Yes. Day 6 at 0.8 here. I thought maybe I wasn’t eating enough. Or I was getting over a flu. But I just want to lay down at every chance I get. I hydrate through the day a lot. So I can’t imagine it’s dehydration. And espressos aren’t really doing the trick for me. I wouldn’t even really consider it fatigue but exhaustion as you said. Or tiredness."
– NotNotKatieHolmes
Another, a week after moving up to the 2.5 mg dose, settled on a comparison from the medicine cabinet and described how sleep and waking had shifted around it.
"I just moved up to 2.5 about a week ago and I am tired all the time. I have been taking it at bedtime around 11pm but it makes it so hard to wake up. The last two days, I slept until 11am! Thankfully I work from home. Going to try taking it at 6 or 7pm. Hopefully that helps. Had some minor nausea today but with the intense fatigue, I didnt move from the couch. It feels like I took a benadryl. My whole body feels heavy and slow."
– Ok-Direction1999
Sleepiness is one thing. For a number of people the harder part is what happens to getting anything done at all.
When Energy and Drive Go Together
At work, one person describes the loss of energy as sudden rather than gradual, and a few attempts to get ahead of it by changing when the tablet was taken.
"Two hours into work, I lost all of my energy, which is not a normal thing for me. I tried taking it about an hour before I got off work, but two hours later, I couldn’t even move the laundry from washer to dryer, […]"
– NN2coolforschool
For someone who has always thought of themselves as high-energy, the change is as much about starting as about stamina, even with activities they usually enjoy.
"I have always been a high energy person and this stuff is kicking my butt. I play pickleball 4 times a week but having a hard time finding the energy to even play. I have to literally make myself do things."
– SureQuiet790
The clock features in almost every one of these accounts, and it is where many people turn next.
Watching the Clock
Almost everyone who writes about the fatigue also writes about timing. Moving the tablet later in the day comes up more than any other change, and the reports of it are far from uniform.
"My only side effect was fatigue initially but when I started taking the pill at 6 PM instead of 6 AM, that helped."
– IdahoGolfer5Aces
Later is not the answer for everyone. One person tried bedtime and swapped daytime tiredness for a broken night.
"I have struggled too with fatigue. I took at bedtime and couldn't sleep at all and messed up sleep cycle. Can't decide if I should continue."
– dressyapple
A third takes it at night and says the tiredness simply outlasts the day, with no obvious next step.
"I take it at night and the fatigue lasts until sunset for me most days… idk what to do tbh"
– Weird-Living-6234
Beyond the clock, the other question people keep asking is how long it lasts, and whether it comes back.
How Long It Lasts
The answers run from days to the better part of two months. One person says it lifted only in the final week of the second month, and arrived at normal with a joke about what normal means with young children.
"My fatigue didn't i improve until the very last week of my 2nd month. now i feel normal (or as normal as a mom in her 50's with 4 yr old twins can feel!)"
– tababnaba76
Another counts the time in bottles rather than weeks, and expects the pattern to repeat with the next step up.
"took me almost the entire bottle of 9mg for the fatigue to improve. just started 14.5mg today, i expect i'll have more fatigue again"
– catsandpink
A similar rhythm appears in a third account: weeks after one move, the next dose brought back the same heaviness.
"A couple of weeks later I’m now beginning 5.5 mg level and feeling kinda zonked again, hoping fatigue subsides in the coming days."
– marchurel0901
And for one person, fatigue was absent through most of the dose steps and then showed up late, as an ache as much as tiredness.
"But I never really had fatigue or anything. I've been on 9 for a week now and my entire body aches. Im so tired."
– IceWindWolf
Whether the tablet is responsible at all is something many of the people posting wonder about.
Looking for Explanations
The question "is it the pill?" is rarely asked lightly. People check food, fluids and sleep, and some come back to the timing of their symptoms.
"But it always seems to heighten within an hour of taking the pill, so I feel like it definitely has a lot to do with it."
– Last-Meringue3
Another reached the opposite conclusion after retracing their steps, having moved the tablet to the evening and found it made no difference.
"Nope. However, after going back carefully, I found that the symptoms started before Foundayo. My doctor is testing for other causes now."
– mykingdomforanap
Whatever the cause, for some the question becomes what the tiredness is costing.
Weighing the Cost
Where the fatigue persists, several people describe a kind of ledger: what the medicine gives and what it takes.
"I’ve been on Foundayo 2 months. Lowest dose. I’ve tried taking it both days and nights. The fatigue has materially affected me and there has been a flattening of activities I used to enjoy. Yeah, I don’t think about food as much, but the cost is too high for me."
– txbayou
Others set the tiredness against the scales, and find the sums do not balance.
"I’m experiencing the same thing. I have unnatural fatigue (for me) since starting the 2.5 mg dose. I’ve lost a couple lbs. but not enough to justify the fatigue I’m feeling."
– seminaryteacher
For some the arithmetic is about days rather than weight: how many a person can afford to lose.
"I can’t afford taking long naps 2 days in a row and also feeling paralyzed."
– Smurfsurf305
Not every account reads this way, and some of the most different ones turn up in the very same threads.
When Energy Holds Steady
Reading only the threads about fatigue gives a lopsided picture, and the people posting in them often say so. In others, people describe a first week with nothing of the kind.
"I’m one week in. Zero fatigue. Very little nausea."
– jimster1109
Some notice the tiredness and shrug it off, treating a nap as the whole of the problem.
"I had a bit of tiredness with the 0.8 mg dose. I’ve had an uptick in sleepiness with the 2.5 mg dose but nothing a nice nap can’t overcome. All in all, it’s been a nominal side effect."
– Finnatically
And for one person, energy is simply on the list of what has gone well, alongside no food noise and a little bloating.
"I have no food noise. Feel a bit bloated. Have loads of energy"
– Dinkiedoo
What Does Medino's Pharmacist Think?
"What stands out is how differently the same tiredness is described: as sleepiness, as heaviness, as a loss of drive, or not at all. People also read the timing in different ways, and several are still working out whether it is the medicine or something else. These are individual accounts, and every person's circumstances differ."
– Alessandro Grenci, Pharmacist at Medino
Tired Means Different Things
Read together, these threads suggest that "fatigue" covers a wide range: an afternoon slump, a day lost to bed, a flattening of interest, or nothing at all. For some it passes within days, for others it tracks each new dose, and a few are still looking for the cause.
What they share is the sense of being surprised by it, and the habit of comparing notes. Most of the people writing are working it out as they go, and no two of them describe it quite the same way.
