Is It Normal to Feel Achy After Taking Ozempic?

Some people describe feeling achy, run down, or vaguely flu-like in the day or two after their injection of Ozempic or another GLP-1. Others notice soreness right at the injection site. Body aches are not one of the most commonly listed side effects, but feeling unwell in a general way is something many people mention, especially early in treatment.

Here is what may be behind it and when to pay closer attention.

The short answer

Mild aches and a run-down feeling after your injection can happen, especially early on and after dose increases, and they are often linked to eating and drinking less. Soreness at the injection site is also common. Aches with fever, a spreading rash, swelling, or trouble breathing are not normal and need prompt attention.

What may cause the achy feeling

• Eating much less, especially in the days after your shot when appetite is lowest.
• Dehydration from drinking less or from vomiting or diarrhea.
• Fatigue, which is a known side effect. The prescribing information for Wegovy, which contains semaglutide, the same active ingredient as Ozempic, at a higher dose, reports that in clinical trials fatigue was reported by 11% of people on the medication against 5% on placebo.
• Poor sleep from nausea or reflux.
• Unrelated illness, like a cold or flu, that happens to coincide with your shot.

Injection site soreness

A little tenderness, redness, or a small bump where you injected can happen and usually fades within a few days. Rotating sites helps. Our guide on GLP-1 injection sites covers where to inject. Tell your provider if a reaction spreads, becomes very painful, warm, or swollen, or lasts more than a few days.

What helps

• Eat something small and often in the days after your shot.
• Sip fluids through the day.
• Rest when you need to, and keep gentle movement like short walks.
• Ask your pharmacist or provider which pain reliever is safe for you.

Our guide on tracking your progress covers ways to note how you feel each day after your injection.

When aches are not normal

Seek care right away for aches with a high fever, a spreading rash or hives, swelling of the face, lips, or throat, or trouble breathing, which can signal a serious allergic reaction or infection. Also contact your provider for severe stomach pain that does not go away, especially if it spreads to your back, severe muscle pain with very dark urine, or aches that keep getting worse.

Could it be something else?

If aches come with a sore throat, cough, congestion, or fever, you may simply have a cold or flu. Treat it as you normally would, keep up fluids, and check with your provider if you are unsure whether to take your next dose while sick.

Dose increases

A run-down feeling often comes back briefly after each step up. If it is hard to manage, ask your provider about holding your dose longer. If you are comparing medications, our guide on tirzepatide and semaglutide side effects covers how they differ, and our guide on the Ozempic starting dose covers what the first weeks usually look like.

If you have diabetes

The prescribing information for Wegovy notes that patients with diabetes mellitus taking it in combination with insulin or an insulin secretagogue, such as a sulfonylurea, may have an increased risk of hypoglycemia, including severe hypoglycemia. Feeling suddenly weak, shaky, or sweaty can be a sign of low blood sugar. Check your blood sugar when this happens, and never change those medicines on your own.

Do not stop on your own

If you feel unwell after every injection, talk to your provider before stopping or skipping doses. Our guide on taking a break and restarting covers why stopping and restarting is more involved than it sounds.

Watch for the signs of under-eating too: persistent fatigue, feeling cold, hair shedding, dizziness when you stand, losing strength, and losing weight faster than you and your provider intended. An achy, run-down feeling that comes with these signs is worth raising with your provider.

It can also help to plan the day after your injection a little more gently. Keep easy foods and drinks ready, avoid scheduling your hardest workout or busiest day right after your shot if you can, and get to bed a little earlier. Many people find the achy feeling fades as the weeks go on.

Consider this scenario: a woman on Ozempic feels achy and run down every Thursday after her Wednesday night injection. On Thursdays she barely eats or drinks and pushes through a long workday. Keeping yogurt, fruit, and a water bottle at her desk, eating small amounts through the day, taking a short walk at lunch, and asking her provider whether a different injection day might suit her better would very likely have made Thursdays easier.

The short version

Feeling achy or run down after taking Ozempic can happen, often from eating and drinking less, fatigue, or poor sleep, and injection site soreness is common. Eat something small and often, sip fluids, rest, and rotate injection sites. Seek care right away for fever, a spreading rash, swelling, trouble breathing, or severe pain, and check your blood sugar if you have diabetes.

If you want a provider who will help you figure out how you are feeling, TrimRx includes ongoing provider access alongside treatment.

This information is for educational purposes and is not medical advice. Consult with a healthcare provider before starting any medication. Individual results may vary.