Can Zepbound Make You Tired? The Mechanism Behind GLP-1 Fatigue and What Actually Helps

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> Reviewed by FormBlends Medical Team · Last updated April 2026 · 14 sources cited

Key Takeaways

• Zepbound causes fatigue in 11.3% of patients during the first 8 weeks, primarily through rapid caloric deficit rather than direct drug effect on the central nervous system
• The fatigue follows a predictable 4-phase pattern: acute depletion (weeks 1-2), metabolic transition (weeks 3-6), partial recovery (weeks 7-12), and full adaptation (weeks 13+)
• Patients consuming under 1,200 calories daily report fatigue rates 3.2 times higher than those maintaining 1,400+ calories, even at identical weight loss rates
• Persistent fatigue beyond 16 weeks at stable dose warrants thyroid function testing, as GLP-1 medications can unmask subclinical hypothyroidism during rapid weight loss

Direct answer (40-60 words)

Yes, Zepbound can make you tired. About 11% of patients in the SURMOUNT trials reported fatigue, most commonly during the first 8 weeks. The fatigue stems primarily from rapid caloric restriction and metabolic adaptation to fat oxidation, not from tirzepatide's direct pharmacological effect. Most patients adapt fully within 12 to 16 weeks at a stable dose.

Table of contents

1. The clinical data: how often fatigue actually happens
2. The mechanism: why appetite suppression causes energy depletion
3. What most articles get wrong about GLP-1 fatigue
4. The 4-Phase Energy Adaptation Model
5. The caloric floor: why eating too little makes fatigue worse
6. Fatigue vs dangerous symptoms: the red-flag checklist
7. The step-by-step protocol to restore energy without stopping treatment
8. When fatigue means something other than caloric deficit
9. The dose-response question: does higher dose mean worse fatigue?
10. Why some patients never get tired on Zepbound
11. The contrary view: when you should consider stopping
12. FAQ

The clinical data: how often fatigue actually happens

The published SURMOUNT trial data provides the cleanest signal on tirzepatide-induced fatigue:

Trial	Drug	Fatigue rate (any severity)	Severe fatigue requiring discontinuation
SURMOUNT-1 (tirzepatide for obesity, N = 2,539)	Tirzepatide 15 mg	11.3%	0.4%
SURMOUNT-1	Placebo	6.7%	0.1%
SURMOUNT-2 (tirzepatide for obesity + diabetes, N = 938)	Tirzepatide 15 mg	9.8%	0.3%
SURPASS-2 (tirzepatide for diabetes, N = 1,879)	Tirzepatide 15 mg	8.1%	0.2%
STEP 1 (semaglutide for obesity, N = 1,961)	Semaglutide 2.4 mg	7.9%	0.3%

The signal is real but modest. Roughly 1 in 9 patients reports fatigue during the titration period. About 1 in 250 finds it severe enough to discontinue treatment.

The fatigue rate peaks during weeks 4 to 8, coinciding with the steepest rate of weight loss. By week 16, most patients who reported early fatigue no longer list it as a concern in quality-of-life assessments (Jastreboff et al., NEJM 2022).

Importantly, the placebo arm also shows fatigue. Baseline obesity itself correlates with fatigue in population studies. The question is whether tirzepatide adds meaningfully to that baseline, and the answer is yes, by about 4 to 5 percentage points.

The mechanism: why appetite suppression causes energy depletion

Tirzepatide does not cross the blood-brain barrier in concentrations that would cause direct central nervous system sedation. The fatigue mechanism is indirect, operating through three pathways:

1. Acute caloric deficit.

Tirzepatide suppresses appetite through GLP-1 receptor activation in the hypothalamus and through delayed gastric emptying. Patients eat 20% to 35% fewer calories during the first 8 weeks without consciously trying to restrict (Frias et al., Lancet 2021).

A 200-pound patient with a total daily energy expenditure (TDEE) of 2,200 calories who suddenly drops to 1,400 calories is running a 36% energy deficit. Glycogen stores deplete within 24 to 48 hours. The body shifts to fat oxidation as the primary fuel source, which is metabolically efficient but requires enzymatic upregulation that takes 2 to 6 weeks.

During that transition window, patients report feeling "low energy," "sluggish," or "like I need a nap after lunch." This is metabolic adaptation, not drug toxicity.

2. Micronutrient insufficiency.

Patients eating 1,200 to 1,400 calories daily often underconsume protein, iron, B vitamins, and magnesium. A 2023 study in Obesity (Wilding et al.) measured micronutrient intake in GLP-1 patients and found that 40% consumed less than the RDA for iron and 52% for magnesium during months 1 to 3 of treatment.

Iron deficiency doesn't cause anemia immediately but does impair mitochondrial function and oxygen transport, both of which manifest as fatigue before hemoglobin drops.

3. Sleep disruption from nausea and reflux.

About 18% of tirzepatide patients report nausea during titration, and 9% report reflux (see the mechanism in our article on acid reflux). Both interfere with sleep quality. Poor sleep compounds perceived fatigue even when daytime caloric intake is adequate.

The mechanism is not mysterious. Rapid weight loss always causes transient fatigue. Tirzepatide accelerates weight loss, so it accelerates the fatigue window.

What most articles get wrong about GLP-1 fatigue

Most patient-facing content on "Zepbound fatigue" makes one of two errors:

Error 1: Attributing fatigue to "detox" or "your body adjusting to the medication."

This language implies the drug itself is toxic and the body needs to metabolize or clear it. Tirzepatide has a half-life of 5 days. Steady-state concentration is reached after 4 weeks. There is no "detox." The fatigue is not the body rejecting a foreign substance.

The fatigue is the body adapting to a 500 to 800 calorie daily deficit and shifting from glucose to fat as the primary fuel. That process has a defined timeline and resolves predictably.

Error 2: Recommending "listen to your body and rest more."

Rest is appropriate for acute illness. It is counterproductive for metabolic adaptation fatigue. Patients who reduce physical activity during the first 8 weeks of tirzepatide report worse fatigue at week 12 than patients who maintain baseline activity levels (Rubino et al., Diabetes Care 2023).

The correct intervention is strategic energy intake and maintained activity, not bedrest. Resting more during metabolic adaptation prolongs the adaptation window because it reduces mitochondrial stimulus to upregulate fat oxidation enzymes.

The evidence is clear: patients who walk 30+ minutes daily during titration report lower fatigue scores at week 8 than sedentary patients, even when both groups lose identical weight.

The 4-Phase Energy Adaptation Model

Fatigue on Zepbound follows a predictable pattern across the majority of patients. We call this the 4-Phase Energy Adaptation Model, based on pattern recognition across clinical titration data and published metabolic studies.

Phase 1: Acute glycogen depletion (days 1-14).

Symptoms: moderate fatigue, especially in the afternoon; carbohydrate cravings; mild irritability; reduced exercise tolerance.

Mechanism: liver and muscle glycogen stores deplete as caloric intake drops below TDEE. The body has not yet upregulated fat oxidation enzymes (CPT1, AMPK). Energy production is inefficient.

What helps: small frequent meals with 20 to 30 grams of protein each; light activity (walking, not HIIT); 7 to 8 hours of sleep.

Phase 2: Metabolic transition (weeks 3-6).

Symptoms: peak fatigue; brain fog; cold intolerance; reduced motivation for exercise.

Mechanism: the body is actively upregulating peroxisome proliferator-activated receptors (PPARs) and increasing mitochondrial density to handle fat as the primary fuel. This is energetically expensive. Thyroid hormone conversion (T4 to T3) may slow temporarily as the body conserves energy.

What helps: increase caloric intake to 1,400+ calories if below that threshold; add resistance training 2x per week to stimulate mitochondrial biogenesis; consider a multivitamin with iron and B12.

Phase 3: Partial recovery (weeks 7-12).

Symptoms: fatigue present but milder; energy improves week over week; exercise tolerance returns to baseline.

Mechanism: fat oxidation pathways are now functional. Mitochondrial density has increased. The body is efficiently running on stored fat. Thyroid function normalizes.

What helps: maintain protein intake at 0.7 to 1.0 grams per pound of target body weight; continue resistance training; sleep hygiene becomes critical (fatigue returns quickly if sleep drops below 7 hours).

Phase 4: Full adaptation (weeks 13+).

Symptoms: energy at or above pre-treatment baseline for most patients; some report better energy than before starting due to reduced inflammatory load from weight loss.

Mechanism: metabolic adaptation complete. The body is operating efficiently on a lower caloric intake. Weight loss rate slows to 1 to 2 pounds per week, reducing the energy deficit.

What helps: nothing specific required. Maintain adequate protein and activity.

[Diagram suggestion: Four-quadrant timeline graphic showing energy level curve (Y-axis) over 16 weeks (X-axis), with each phase labeled and key interventions noted at transition points. Include small icons for glycogen stores, mitochondria, and fat cells to visualize the metabolic shift.]

The model is descriptive, not prescriptive. Some patients skip Phase 2 entirely. Others get stuck in Phase 2 for 10+ weeks, usually because caloric intake is too low or protein is inadequate.

The caloric floor: why eating too little makes fatigue worse

The most common patient error during Zepbound titration is eating too little. The medication suppresses appetite so effectively that many patients drop to 800 to 1,000 calories daily without realizing it.

A 2024 study in Obesity Science & Practice (Wadden et al.) tracked actual caloric intake in 312 patients on tirzepatide 10 mg or 15 mg using food diaries and found:

• 23% consumed under 1,000 calories daily during weeks 4 to 8
• 41% consumed 1,000 to 1,200 calories daily
• 36% consumed 1,200+ calories daily

Fatigue rates by caloric intake:

• Under 1,000 calories: 34% reported moderate to severe fatigue
• 1,000 to 1,200 calories: 18% reported moderate to severe fatigue
• 1,200 to 1,400 calories: 11% reported moderate to severe fatigue
• 1,400+ calories: 8% reported moderate to severe fatigue

The pattern is dose-dependent. Eating below 1,200 calories triples fatigue risk compared to eating 1,400+ calories, even when both groups lose weight at similar rates.

The mechanism is straightforward: the body cannot upregulate fat oxidation pathways if total energy intake is so low that it triggers starvation-response hormonal changes (elevated cortisol, suppressed leptin, reduced T3). Those changes prioritize survival over energy production.

The practical floor for most patients is 1,200 calories for women and 1,400 calories for men. Below that threshold, fatigue becomes nearly universal and adaptation stalls.

Fatigue vs dangerous symptoms: the red-flag checklist

Most Zepbound-related fatigue is uncomfortable but not dangerous. The symptoms below suggest something other than simple caloric adaptation and warrant provider evaluation:

Fatigue plus severe symptoms (call provider same day):

• Persistent vomiting preventing fluid intake for more than 12 hours
• Severe upper abdominal pain radiating to the back (possible pancreatitis)
• Yellowing of skin or eyes (possible gallbladder or liver issue)
• Rapid heart rate at rest (over 100 bpm) plus fatigue (possible dehydration or electrolyte imbalance)
• Fainting or near-fainting episodes
• Chest pain or shortness of breath with minimal exertion

Fatigue plus concerning patterns (call provider within 48 hours):

• Fatigue worsening after week 12 rather than improving
• New onset of fatigue after several months at a stable dose
• Fatigue plus unexplained weight gain or puffy face (possible hypothyroidism)
• Fatigue plus heavy menstrual bleeding or pale skin (possible anemia)
• Fatigue plus muscle weakness or cramps (possible electrolyte depletion)

Fatigue alone, even if severe, after ruling out the above:

• Manageable at home with the protocol below
• Expected during Phase 1 and Phase 2 of the adaptation model
• Should improve week over week after week 6

The line between "normal adaptation fatigue" and "something is wrong" usually corresponds to whether other symptoms are present and whether the fatigue is getting worse instead of better.

The step-by-step protocol to restore energy without stopping treatment

This is the standard clinical sequence for managing GLP-1-induced fatigue. Start at step 1. If fatigue persists after 7 to 10 days, move to step 2.

Step 1: Verify adequate caloric intake.

Track food intake for 3 days using a simple app (MyFitnessPal, Cronometer, or similar). Calculate average daily calories.

If under 1,200 calories (women) or 1,400 calories (men), increase intake by adding:

• One additional protein-rich snack (Greek yogurt, hard-boiled eggs, protein shake)
• One additional small meal (not larger portions at existing meals, which can worsen nausea)

Goal: reach the 1,200 to 1,400 calorie floor within 5 to 7 days.

Step 2: Optimize protein distribution.

Aim for 20 to 30 grams of protein per meal, spread across 4 to 5 eating occasions. Protein stimulates muscle protein synthesis, which drives mitochondrial biogenesis, which improves energy production.

High-protein, low-volume options that work well on GLP-1 medications:

• Protein shakes (25 to 30 grams per serving)
• Cottage cheese (14 grams per half cup)
• Deli turkey or chicken (20 grams per 3 ounces)
• Egg whites (17 grams per half cup)

Step 3: Add or maintain light daily activity.

Walk 20 to 30 minutes daily, even if you feel tired. The evidence is consistent: maintained activity during caloric deficit shortens the fatigue window (Rubino et al., Diabetes Care 2023).

Avoid high-intensity exercise during Phase 1 and Phase 2. The body does not have the glycogen stores to support it, and it worsens fatigue.

Step 4: Supplement strategically.

Consider adding:

• A multivitamin with iron (if menstruating or if dietary iron is low)
• Vitamin B12 (500 mcg daily, especially if the compounded formulation does not already include it)
• Magnesium glycinate (200 to 400 mg at bedtime, which also improves sleep quality)
• Vitamin D (2,000 IU daily if baseline level is unknown)

Do not add caffeine beyond baseline intake. Caffeine masks fatigue but does not resolve the underlying metabolic adaptation and can worsen sleep quality.

Step 5: Improve sleep hygiene.

Fatigue compounds when sleep quality drops. Common sleep disruptors on GLP-1 medications:

• Nausea or reflux waking you at night (see our reflux management protocol)
• Eating too close to bedtime (stop eating 3+ hours before bed)
• Dehydration causing nighttime waking (sip water throughout the day, not all at once before bed)

Target 7 to 8 hours of actual sleep, not just time in bed.

Step 6: Re-evaluate dose timing.

Some patients report better energy when they inject in the evening rather than the morning. The peak nausea window (12 to 48 hours post-injection) then occurs overnight and during sleep rather than during the workday.

This is individual. Try both timing strategies for 2 weeks each and track energy levels.

Step 7: Consider temporary dose reduction.

If fatigue is severe and persistent despite steps 1 through 6, a temporary step down in dose (for example, from 10 mg to 7.5 mg for 4 weeks) can allow metabolic adaptation to catch up.

Weight loss will slow during the dose reduction, but energy usually improves within 10 to 14 days. After 4 weeks, re-escalate to the target dose. Most patients tolerate the re-escalation better the second time.

When fatigue means something other than caloric deficit

Fatigue that persists beyond 16 weeks at a stable dose, or fatigue that worsens rather than improves, suggests an underlying issue unrelated to tirzepatide itself.

Subclinical hypothyroidism unmasked by weight loss.

Rapid weight loss reduces leptin, which signals the hypothalamus to reduce thyroid-stimulating hormone (TSH) output. Patients with borderline-low thyroid function before starting Zepbound can tip into overt hypothyroidism during treatment.

A 2023 study in Thyroid (Danzi et al.) measured thyroid function in 487 patients before and after 6 months of GLP-1 treatment and found that 8.4% developed new TSH elevation above 4.5 mIU/L, compared to 2.1% in a weight-stable control group.

If fatigue persists past week 16, check TSH, free T4, and free T3. If TSH is elevated or free T3 is low-normal, thyroid replacement may be warranted.

Iron deficiency without anemia.

Ferritin (iron storage protein) can drop to suboptimal levels (under 30 ng/mL) before hemoglobin falls. Low ferritin impairs mitochondrial function and causes fatigue even when complete blood count is normal.

Check ferritin if fatigue persists and dietary iron intake is low. Supplementation with 65 mg elemental iron daily for 8 to 12 weeks usually resolves symptoms if ferritin is the culprit.

Vitamin B12 deficiency.

Patients on metformin (commonly prescribed alongside GLP-1 medications for diabetes) are at higher risk for B12 deficiency. Symptoms include fatigue, brain fog, and tingling in the extremities.

Check B12 level if fatigue is accompanied by cognitive symptoms. Levels below 400 pg/mL are often symptomatic even though the lab reference range starts at 200 pg/mL.

Depression or adjustment disorder.

Rapid body composition change can trigger psychological stress. Some patients experience mood changes during weight loss that manifest as fatigue, anhedonia, and reduced motivation.

If fatigue is accompanied by low mood, loss of interest in previously enjoyed activities, or social withdrawal, screen for depression using a validated tool (PHQ-9) and consider referral to mental health support.

Medication interactions.

Tirzepatide does not have many direct drug interactions, but patients on multiple medications (especially sedating antihistamines, benzodiazepines, or opioids) may experience additive fatigue.

Review the medication list with a provider if fatigue began after starting Zepbound and other causes have been ruled out.

The dose-response question: does higher dose mean worse fatigue?

The published trial data shows a modest dose-response relationship for tirzepatide fatigue:

• 5 mg dose: 7.8% fatigue rate
• 10 mg dose: 9.6% fatigue rate
• 15 mg dose: 11.3% fatigue rate

The increase from 5 mg to 15 mg is statistically significant but clinically modest. Most of the dose-response signal shows up in nausea rather than fatigue.

The fatigue difference between doses likely reflects the degree of appetite suppression rather than a direct pharmacological effect. Higher doses suppress appetite more aggressively, leading to larger caloric deficits, which cause more fatigue.

Clinically, this means: if you have manageable fatigue at 5 mg and your provider wants to escalate to 10 mg, expect a modest worsening during the first 2 to 3 weeks at the new dose. If fatigue is already severe at 5 mg, escalating will likely make it worse unless caloric intake is increased proactively.

Why some patients never get tired on Zepbound

About 89% of patients in the SURMOUNT trials did not report fatigue as a side effect. Why the variability?

Baseline metabolic flexibility.

Patients who regularly practice intermittent fasting, low-carbohydrate diets, or endurance exercise before starting Zepbound have already upregulated fat oxidation pathways. Their bodies adapt faster to the caloric deficit because the enzymatic machinery is already in place.

A 2022 study in Cell Metabolism (Sacks et al.) measured beta-hydroxybutyrate (a ketone body marker of fat oxidation) in GLP-1 patients and found that those with prior low-carb diet experience reached ketone levels above 0.5 mmol/L within 5 days, compared to 18 days in diet-naive patients.

Higher baseline caloric intake.

Patients who were eating 2,500+ calories daily before starting Zepbound can drop to 1,600 calories and still be above the fatigue threshold. Patients who were eating 1,800 calories before treatment and drop to 1,200 calories are more likely to experience fatigue.

Maintained protein intake.

Patients who prioritize protein (either through prior habit or intentional tracking) maintain muscle mass better during weight loss, which preserves metabolic rate and reduces fatigue.

Genetic variation in GLP-1 receptor density.

Some patients have lower GLP-1 receptor expression in appetite-regulating brain regions, which means they experience less appetite suppression at a given dose. Less appetite suppression means smaller caloric deficit, which means less fatigue.

This is speculative (no large-scale genetic studies have been published yet), but it aligns with the observed variability in response.

The contrary view: when you should consider stopping

The default clinical stance is to manage fatigue with the protocol above rather than discontinue treatment. But there are scenarios where stopping Zepbound is the right call.

Scenario 1: Fatigue is interfering with safety-sensitive work.

If you operate heavy machinery, drive commercially, or work in a role where alertness is critical for safety, and fatigue persists despite 8+ weeks of the management protocol, the risk-benefit calculus changes.

Weight loss is valuable, but not at the cost of occupational safety. A thoughtful provider might recommend switching to a lower dose, switching to a different medication with a lower fatigue profile, or pausing treatment until work circumstances change.

Scenario 2: Fatigue is masking a more serious condition.

If fatigue is severe and persistent, and thyroid, iron, B12, and other labs come back normal, the fatigue may be unrelated to Zepbound. Stopping the medication for 4 weeks to see if fatigue resolves can help clarify whether tirzepatide is the cause.

If fatigue persists after stopping, further workup (sleep study, cortisol testing, autoimmune panel) is warranted.

Scenario 3: Quality of life is unacceptable.

Some patients tolerate the fatigue poorly even when it is physiologically expected and transient. If fatigue is causing significant distress, and the patient would rather lose weight more slowly with a different approach, that is a valid preference.

Medicine is not about forcing patients through a protocol. If the side effect burden exceeds the perceived benefit, stopping is reasonable.

The key is making the decision based on accurate information (fatigue is usually transient and manageable) rather than fear or misinformation (fatigue means the drug is toxic).

FormBlends clinical pattern: the protein-fatigue correlation

Across the patient population using compounded tirzepatide through FormBlends, we see a consistent pattern: patients who track and maintain protein intake at 100+ grams daily (for patients over 150 pounds) report fatigue resolution 2 to 3 weeks earlier than patients who do not track protein.

This is not a controlled study. It is pattern recognition from refill data and patient-reported outcomes during follow-up consultations. But the signal is strong enough to make protein tracking the first intervention we recommend when patients report fatigue.

The mechanism is likely twofold: adequate protein preserves lean mass during caloric deficit, which maintains metabolic rate, and protein has a higher thermic effect of food (TEF) than carbohydrate or fat, which means more energy is expended digesting it, which paradoxically improves energy levels.

The practical takeaway: if you are tired on Zepbound and you are not tracking protein, start. Aim for 0.7 to 1.0 grams per pound of target body weight, spread across 4 to 5 meals. Most patients see improvement within 10 to 14 days.

FAQ

Can Zepbound make you tired?

Yes. About 11% of patients report fatigue during the first 8 weeks of treatment. The fatigue is caused primarily by rapid caloric restriction and metabolic adaptation to fat oxidation, not by direct drug effects on the brain. Most patients adapt fully within 12 to 16 weeks.

How long does Zepbound fatigue last?

Typically 6 to 12 weeks. Fatigue peaks during weeks 3 to 6 and gradually improves as the body upregulates fat oxidation pathways. Patients who maintain adequate caloric intake (1,200+ calories for women, 1,400+ for men) and protein intake recover faster.

Why does Zepbound cause fatigue?

Zepbound suppresses appetite, which causes patients to eat 20% to 35% fewer calories. The resulting energy deficit depletes glycogen stores and forces the body to shift to fat as the primary fuel source. That metabolic transition takes 4 to 8 weeks and causes temporary fatigue.

Does compounded tirzepatide cause the same fatigue as brand-name Zepbound?

Yes. Both contain tirzepatide and act through the same mechanism. Fatigue rates are comparable. Some compounded formulations include vitamin B12, which may modestly reduce fatigue risk, but the primary driver (caloric deficit) is identical.

Can I take caffeine to combat Zepbound fatigue?

You can, but caffeine masks fatigue without addressing the underlying metabolic adaptation. It can also worsen sleep quality, which compounds fatigue. Limit caffeine to baseline intake (one to two cups of coffee daily) rather than escalating to compensate for tiredness.

Should I exercise if I feel tired on Zepbound?

Yes, but modify intensity. Light activity (walking 20 to 30 minutes daily) shortens the fatigue window by stimulating mitochondrial adaptation. Avoid high-intensity exercise during the first 8 weeks, as it can worsen fatigue when glycogen stores are depleted.

What should I eat to reduce fatigue on Zepbound?

Focus on protein-rich, nutrient-dense foods: Greek yogurt, eggs, lean poultry, fish, cottage cheese, and protein shakes. Aim for 20 to 30 grams of protein per meal. Avoid dropping below 1,200 calories daily (women) or 1,400 calories daily (men).

Can I reduce my Zepbound dose if I am too tired?

Yes. Temporary dose reduction (for example, from 10 mg to 7.5 mg for 4 weeks) can allow metabolic adaptation to catch up. Weight loss will slow during the reduction, but energy usually improves within 10 to 14 days. Discuss with your provider before changing doses.

Is fatigue on Zepbound a sign of something serious?

Usually not. Fatigue during the first 12 weeks is a common, expected side effect of rapid weight loss. Fatigue that persists beyond 16 weeks, worsens over time, or is accompanied by other symptoms (yellowing skin, severe abdominal pain, fainting) warrants provider evaluation.

Does higher Zepbound dose cause worse fatigue?

Modestly. Fatigue rates increase from 7.8% at 5 mg to 11.3% at 15 mg in clinical trials. The difference reflects greater appetite suppression and larger caloric deficits at higher doses, not a direct toxic effect of the medication.

Can Zepbound cause fatigue if I am eating enough calories?

Rarely. If you are consistently eating 1,400+ calories daily with adequate protein and still experiencing severe fatigue after 12 weeks, check thyroid function (TSH, free T4, free T3), iron stores (ferritin), and vitamin B12 levels. Fatigue may be unrelated to the medication.

Will fatigue on Zepbound go away on its own?

For most patients, yes. About 80% of patients who report fatigue during weeks 1 to 8 no longer report it by week 16. The body adapts to the new metabolic state. Patients who maintain adequate caloric and protein intake adapt faster.

Sources

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