Can my GLP-1 cause tiredness, headaches, dizziness, aches, anxiety, or trouble sleeping?

Stomach symptoms get most of the attention, but many people notice other changes too, especially in the first weeks and after a dose increase. Most are mild and ease as your body adjusts. This guide covers the non-stomach symptoms we hear about most, what usually helps, and when to message your care team. For nausea, constipation, reflux, and diarrhea, see "GLP-1 side effects and what's normal".

The key point: a lot of these symptoms come from eating or drinking less than your body needs, not from the medication itself. Protein, fiber, fluids, and regular meals are the first things to check. Your care team decides about any dose change.

Tiredness and low energy

Feeling tired on injection day and the day after is common, especially when you start or move up a dose. It usually improves over several days to a few weeks.

• Take your shot in the evening so you can rest through the worst of it.
• Eat small, balanced meals with protein and complex carbs. A common target is around 100 g of protein a day, since low protein can add to low energy. Your care team can tailor this for you.
• Stay hydrated. See "How much water should I drink, and do I need electrolytes?".
• Plan lighter days after your injection, rest as needed, and take short walks.

Message your care team if tiredness is severe, lasts more than a few days, goes on for several weeks, or comes with dizziness or signs of low blood sugar (see below). They may check for other causes, such as lab work, and review your dose. If you were already living with a fatigue condition, tell them if symptoms go beyond your usual baseline.

If you feel tired and foggy even though you are eating well and taking supplements, that needs a conversation with your care team rather than more supplements. Ask them whether an energy-support option is right for you.

Headaches and body aches

Headaches are common when you first start, because appetite, food, and fluids all change at once.

• Drink enough fluids, and add electrolytes if you are losing fluid (see the hydration guide above).
• Eat regular, balanced meals so your blood sugar does not dip.
• Over-the-counter pain relievers such as Tylenol or Advil are acceptable for most people. Follow the label, and check with your care team or pharmacist first if you have kidney, stomach, or heart problems or take other medicines.
• Eye twitching is usually related to tiredness, stress, caffeine, or low fluids rather than the medication.

Body aches are not a typical effect of the medication itself and may have other causes. Generalized achiness that clears within about a day after your first dose is usually a short-term adjustment. If you have aches that come and go with each injection, tell your care team. The additive in some formulations can play a part, and they can talk through options.

Message your care team if headaches last more than 1 to 2 weeks despite better hydration, or if aches come back with every dose.

Dizziness and lightheadedness

Feeling lightheaded can mean low blood sugar or low blood pressure, often from not eating enough, not drinking enough, or both. Some people notice it mostly the day after the injection, easing through the week, which can mean your body needs more time at that dose.

• Eat small, frequent meals and do not go long stretches without food.
• Drink fluids and consider electrolytes.
• Stand up slowly after sitting or bending over.
• If you feel shaky, sweaty, or faint and have not eaten, have juice or a snack to raise your blood sugar.
• Plan restful days after your injection.

Message your care team if symptoms continue for more than a few days, come back with each dose, or began after a dose increase. They will review your dose and may suggest staying at a lower dose longer. A month of lightheadedness with weakness needs a provider's assessment.

Seek urgent care if dizziness is severe, you faint, or it comes with chest pain, trouble breathing, or a racing or irregular heartbeat. For emergencies, call 911.

Blood pressure: GLP-1 medications do not typically raise blood pressure. If anything, they tend to lower it. If you are getting high readings, tell your care team or your primary care provider.

Anxiety, trouble sleeping, and feeling jittery

Anxiety and sleep problems can happen with GLP-1 medications, though they are not among the most common effects. Two things may contribute: the timing of your injection and undereating, which can cause low blood sugar. Feeling shaky or jittery can also come from dehydration or skipped meals.

• Make sure you are eating enough protein and fiber across the day.
• Some people sleep better when they move the injection from evening to morning, and some feel more tired in the morning. Ask your care team before changing your injection day or time.
• Try a different injection site.
• If symptoms show up mostly at higher doses, your care team may suggest a temporary lower dose, or ask whether split dosing (a smaller dose twice in the week) is an option for you. Do not split or lower a dose on your own.

Message your care team if anxiety, a racing heart, or poor sleep is getting in the way of your day.

Heat, sweating, and hot flushes

Hot flushes and heavy sweating are not commonly linked to GLP-1 medications. Stay well hydrated and schedule a call with a provider so they can look at what else may be going on.

Taste changes

Some people notice a metallic, minty, or otherwise altered taste on tirzepatide. It has been reported, and there is no set time for it to go away, but it often improves over time. Contact your care team if it gets worse or bothers you.

Pinching, aching, or swelling around injections

• Sharp or pinching pain in your arm or shoulder that starts a few hours after an injection: do not inject again until you have spoken with a Belle provider.
• Ear pain that gets worse a day or two after your dose: this can be related to fluid shifts after injection. Tell your care team. They may suggest more fluids, ask about split dosing, or recommend an ENT visit.
• Stinging when injecting glutathione: let the solution come to room temperature for 15 to 30 minutes, and make sure your skin is completely dry after the alcohol wipe before you inject.

Symptoms that are probably not from your medication

These are not common GLP-1 effects. Talk to your primary care provider or the right specialist, and tell your care team too:

• Ringing in the ears that is new and does not go away: see your primary care provider or an ENT.
• Severe or ongoing hiccups: not common. Message your care team.
• Severe genital itching, especially if an over-the-counter antifungal did not help: see a gynecologist.
• Knee or joint swelling: may be unrelated, such as an arthritis flare. See your primary care provider.
• Nausea when you exercise or your heart rate is up: check dose, meal timing, hydration, and what you ate. Your care team can talk with you about anti-nausea medication.

When to get help right away

Seek urgent care or call 911 for severe or life-threatening symptoms: chest pain, trouble breathing, fainting, confusion, severe weakness, swelling of the face or throat, or sudden vision changes. See "When should I seek urgent care on a GLP-1?" for the full list.

💬 Not sure whether a symptom is normal? Message your care team and tell them what you feel, when it started, and whether it is tied to your injection day.