Does Wegovy or Ozempic make you tired?

Short answer: it can. In the Wegovy (semaglutide 2.4 mg) trials, 11% of adults reported fatigue or weakness against 5% on placebo, and 11% did at the newer 7.2 mg dose.^[1] The Ozempic label lists fatigue without a percentage.^[2] Most people did not report it, and eating and drinking far less is often part of the story.

This page is the drug-specific version: what the Wegovy and Ozempic prescribing information actually records, by dose, and a checklist for low-appetite days. The general causes of tiredness on any of these medications are in why GLP-1 medications can leave you tired, and the food side sits under our guide to what to eat when you're eating less. None of it replaces your prescriber's advice about the medication itself.

Does Wegovy make you tired, according to the label?

Every prescription drug's label has a section called Adverse Reactions (section 6.1) with a table of what people reported in the trials, on the drug and on placebo. For semaglutide and, for comparison, tirzepatide, this is what the current labels say about tiredness.

Medication and dose	Who was studied	Fatigue reported	Placebo
Wegovy injection 2.4 mg weekly	2,116 adults with obesity or overweight, up to 68 weeks	11%	5%
Wegovy injection 7.2 mg weekly	1,311 adults with obesity, 72-week trials	11%	5% (9% on 2.4 mg in the same trials)
Wegovy tablet 25 mg daily	204 adults, up to 64 weeks	No separate figure; the label says common reactions were similar to the 2.4 mg injection	–
Ozempic 0.5 mg, 1 mg, 2 mg weekly	Adults with type 2 diabetes	Listed among reactions above 0.4%; no figure given	–
Zepbound 5 / 10 / 15 mg weekly	2,519 adults with obesity or overweight, up to 72 weeks	5% / 6% / 7%	3%

Sources: Wegovy prescribing information, section 6.1, Tables 3 and 4 and the tablet text;^[1] Ozempic prescribing information, section 6.1;^[2] Zepbound prescribing information, section 6.1, Table 1.^[3] In the Wegovy tables "fatigue" includes fatigue and asthenia, the medical word for weakness. In the Zepbound table it also includes lethargy and malaise.

Two cautions. The labels warn that rates from one drug's trials cannot be directly compared with another's, because the trials ran under different conditions.^[1] And the placebo column matters: some tiredness turns up in any large group of people followed for over a year, so the useful number is the gap between the two columns, not the headline figure. For the tirzepatide side in detail, see does Zepbound make you tired.

Does semaglutide make you more tired at higher doses?

The Wegovy label gives one direct comparison. In the two 72-week trials of the 7.2 mg dose, fatigue was reported by 5% on placebo, 9% on 2.4 mg and 11% on 7.2 mg.^[1] That is a small step with dose, not a dramatic one. The Ozempic doses used for type 2 diabetes are much lower, and that label puts fatigue in a short list of reactions above 0.4% without tabulating it.^[2]

Timing matters as much as dose. A 2025 joint advisory from four US medical and nutrition societies notes that adverse reactions on these medications are more likely in the first weeks and around dose increases, and tend to ease on a stable dose.^[4] The Wegovy label says the same of stomach reactions specifically: they were reported most often during dose escalation.^[1]

Why would Wegovy make you tired?

The label does not say why. It does record several things that sit close to tiredness, and the advisory adds the biggest one.

• Much less food. People on these medications eat 16% to 39% fewer calories than on placebo, according to the advisory, and it names "fatigue beyond expected levels" as one sign of a true nutrient deficiency.^[4]
• Fluid lost or never drunk. The Wegovy Medication Guide warns that diarrhea and vomiting can cause dehydration and asks people to drink fluids.^[1] Eating less also removes the water that comes with food.
• Dizziness and low blood pressure. Dizziness was reported by 8% on Wegovy 2.4 mg and 4% on placebo. Low blood pressure was reported by 1.3% against 0.4%, and fainting by 0.8% against 0.2%; the label links some of these to stomach reactions and fluid loss, and to blood pressure medicines taken alongside.^[1]
• Low blood sugar in type 2 diabetes. In a Wegovy trial in adults with type 2 diabetes, blood glucose below 54 mg/dL was recorded in 6.2% on the drug and 2.5% on placebo, with the risk higher alongside a sulfonylurea.^[1] Shakiness, sweating and sudden tiredness that ease after eating are worth reporting.

Three of those four come back to intake. That is the part a checklist can reach.

What should a low-appetite day include?

On a day when food is the last thing on your mind, these are the things worth checking off, in order. They are a floor for a bad day, not a plan for every day.

Check	What it looks like on a low day	Why
Something eaten within a few hours of waking	Half a pot of Greek yogurt, an egg, a slice of toast	The advisory suggests a small breakfast rather than waiting for hunger[4]
A small meal every three to four hours	Set a reminder; do not wait to feel hungry	Long gaps without food are on the advisory's list to avoid[4]
Protein at each eating occasion, eaten first	Eggs, cottage cheese, fish, chicken, tofu, lentils	Protein is often the first thing left on the plate[4]
Fluid through the whole day	A glass with each small meal and sips between	The Medication Guide asks people to drink fluids to lower the chance of dehydration[1]
Some salt with the fluid after vomiting or diarrhea	A cup of broth or soup	Water alone does not replace the sodium that went with it[5]
A fruit or vegetable	A banana, berries, cooked carrots	Potassium, vitamin C and fiber in a small space[6]
Low blood sugar ruled out	If you have type 2 diabetes and use insulin or a sulfonylurea, check as your prescriber has advised	The label records more low readings on the drug[1]

If most of the rows are empty on most days, that is the likelier explanation for feeling flat than the medication acting on your energy directly. Amounts for each item are in how much protein to eat on a GLP-1 and dehydration on a GLP-1, and the food side of a semaglutide day is laid out in what to eat on Wegovy.

For transparency about our own product: Zornava Replenish is a lemon-lime drink mix with electrolytes, six vitamins and a prebiotic fiber, made for lighter appetite days. It is one way to put something in the glass on the fluid row of that table. It is not an energy product and not a fix for tiredness, and it does not replace any of the food rows.

Is the Wegovy pill different?

The label gives no separate fatigue figure for the 25 mg tablet; it says the types and frequency of common reactions were similar to the injection.^[1] What does differ is the morning. The tablet is taken on an empty stomach with no more than 4 ounces of water, and the label says to wait at least 30 minutes before eating, drinking anything else or taking other oral medicines.^[1]

On a small appetite, that half hour can quietly become no breakfast at all. Have the first small meal ready for when the 30 minutes are up, so the wait does not turn into the long gap the checklist is trying to avoid.

How long does tiredness on Wegovy last?

No label gives a duration. The trials ran for 68 to 72 weeks, and the figures above are the share of people who reported fatigue at any point in that time, not how long it lasted.^[1] The advisory's general observation is that adverse reactions are most likely early and around dose increases, and lessen on a stable dose.^[4]

Tiredness that follows a dose step and settles over a few weeks fits that pattern. Tiredness that keeps going on a stable dose, or arrives months in, points somewhere else, and is worth blood work rather than guessing. Iron and B12 are the usual suspects, because tiredness is a recognised sign of a shortfall in either;^[7][8] the reasoning is in which vitamins matter on a GLP-1.

When should you call your prescriber?

• Tiredness that is severe, getting worse, or still there weeks after a dose has been stable.
• Dizziness or feeling faint when you stand, especially if you also take blood pressure medicine.
• Signs of dehydration: very little or very dark urine, a racing heart, not keeping fluids down.
• Shakiness, sweating or confusion, if you have diabetes.
• Vomiting or diarrhea that will not settle.
• Any thought of changing your dose or stopping. That is a conversation, not a decision to make alone.

Your prescriber can look at the dose and the pace of increases, order blood tests, and refer you to a registered dietitian.

Not sure which part of your intake is slipping on lighter days? Our two-minute quiz sorts it into water, protein, fiber and vitamins.