Key takeaways
- More common side effects of Repatha may include cold and flu-like symptoms, back pain, and injection site reactions.
- Mild Repatha side effects also include headache, fatigue, stomach cramping, and diarrhea.
- Possible serious side effects include high blood sugar, diabetes, and severe allergic reaction. If you have symptoms of serious side effects from Repatha, call your doctor right away or call 911 or your local emergency number.
Starting a new medication like Repatha is a significant step toward managing your heart health and cholesterol levels. While most people find the treatment easy to incorporate into their routine, it’s common to have questions about potential side effects and how they might impact your daily life.
This guide will help you understand what to expect, how to manage common symptoms with simple home care, and when to reach out to your doctor for additional support.
In clinical studies, most side effects reported with Repatha were mild and manageable, often resolving on their own as your body becomes accustomed to the medication.
Because Repatha is a biologic medication (meaning it’s developed from living cells), your immune system may need a short period to adjust to the introduction of the medication.
Here are a few of the more common side effects reported by people who took Repatha in studies. These side effects can vary depending on what condition the drug is being used to treat.
| Common side effect | What to expect | Typical duration |
|---|---|---|
| upper respiratory tract infection | cold or flu-like symptoms, such as a runny nose, sore throat, or cough | temporary; resembles a seasonal cold |
| injection site reactions | redness or discoloration, itching, pain, or bruising where the medication was administered | usually fades quickly within a few hours or days |
| back pain and joint pain | a dull ache or “flu-like” body stiffness, particularly in the back or joints | most noticeable during the first few doses |
| general body symptoms | mild fatigue, headache, or digestive changes like diarrhea or stomach cramping | often improves with hydration and rest |
Tip for comfort: To help reduce discomfort or a “stinging” sensation during your injection, take your Repatha SureClick auto-injector out of the refrigerator about 30 minutes before use and let it come to room temperature. Avoid using a microwave or hot water to speed up this process, as extreme heat can damage the biologic proteins.
Managing your daily routine
If you do experience mild side effects, there are several simple, proactive ways to help find relief:
- For injection site reactions: Doctors typically recommend rotating your injection sites (using a different spot for each injection). Options include your abdomen (avoiding the 2-inch area around your navel), the front of your thighs, or the outer area of your upper arms. It is best to avoid injecting into skin that is already tender, bruised, discolored, or hard to the touch.
- For back or joint pain: Staying active with gentle movement or stretching can help keep joints limber. Over-the-counter (OTC) pain relievers like acetaminophen (Tylenol) or ibuprofen (Advil) can also provide effective relief for these temporary aches. It’s important to check with your doctor or pharmacist before starting a new OTC medication to ensure it doesn’t interact with Repatha.
- For fatigue and other body symptoms: While usually mild, listen to your body’s signals. It’s helpful to stay well-hydrated throughout the day, as dehydration can mimic or worsen side effects like headaches and tiredness. If your fatigue is accompanied by unusual symptoms like extreme thirst or a frequent need to urinate, it’s a good idea to mention this to your healthcare team for review.
Medical Perspective“Most mild side effects tend to go away after a few weeks of starting a new medication. Be sure to contact your doctor or pharmacist if you continue to experience side effects — or if they worsen — after your first couple of doses.”
— Kristina D. Carter, PharmD, MBA, MHA
» More: Our hub for heart health management, insights, and solutions
Quotes represent the opinions of our medical experts. All content is strictly informational and should not be considered medical advice.
While most serious side effects aren’t common, it’s helpful to be aware of them so you can consult your doctor if they occur.
Blood sugar and diabetes
In clinical trials, Repatha caused high blood sugar that sometimes led to the development of type 2 diabetes.
The risk of type 2 diabetes with Repatha may be higher in people with preexisting diabetes risk factors and people with established heart disease.
Your doctor will likely monitor your blood sugar and hemoglobin A1c (HbA1c) during your routine check-up. They can also show you how to monitor your blood sugar at home. Between appointments, it’s important to contact your doctor if you notice:
- an unquenchable thirst
- more frequent need to urinate
- unexplained blurred vision or sudden changes in your energy levels
Allergic reactions
Serious allergic reactions (hypersensitivity) are uncommon but possible.
- Latex allergy: The needle cover on some forms of Repatha contains dry natural rubber, which is made from latex. If you have a latex allergy, talk with your doctor about latex-free forms of Repatha.
- Symptoms of an allergic reaction: Please seek emergency medical attention if you experience swelling of the face, lips, or tongue; a severe or spreading rash; hives; or any difficulty breathing or swallowing.
Experiencing side effects? After the Food and Drug Administration (FDA) approves a drug, it tracks and reviews side effects of the medication. If you develop a side effect while taking this drug and want to tell the FDA about it, visit MedWatch or call 800-FDA-1088.
No, weight gain, weight loss, and hair loss were not reported as side effects of Repatha during its clinical trials. However, many people take Repatha alongside a statin. It’s worth noting that some statins can occasionally cause thinning hair.
In addition, diabetes and high blood sugar are side effects of Repatha. In some cases, weight gain or loss can be a symptom of these side effects.
If you notice these changes, your doctor can help you determine which part of your treatment plan may be causing it.
No, it’s important to speak with your doctor before making any changes to your treatment. Repatha works by continuously blocking the PCSK9 protein. If you stop, your LDL (“bad”) cholesterol levels can quickly return to their original levels.
If a side effect is affecting your quality of life, your doctor can help you find ways to manage it or adjust the timing of your doses.
» More on this: Dosage Details for Repatha (Evolocumab)
No, Repatha isn’t known to cause liver-related side effects. While many oral cholesterol medications are heavily processed by the liver, Repatha is a monoclonal antibody and follows a different path in the body.
If you’re taking Repatha with a statin drug, your doctor will continue to monitor your overall organ function as a standard precaution.
One of the most effective ways to manage your health is to keep a simple record for the first few months of treatment. Note the following:
- the date and time of your injection
- the specific injection site (for example, “left thigh”)
- any symptoms you felt and what you did to manage them
This information provides a clear overview for your doctor during your follow-up appointments, allowing them to see how you are responding and ensuring your treatment plan is tailored to your needs.
Repatha is a safe and effective treatment for managing high cholesterol, and most associated side effects are mild and manageable. You can help minimize certain side effects by following simple steps like rotating your injection site, allowing Repatha to reach room temperature before injection, and staying hydrated.
It’s important to maintain open communication with your healthcare team and track your side effects throughout treatment. While rare, monitoring for signs of blood sugar changes or allergic reactions helps ensure that your treatment plan remains safe and effective for you.
Disclaimer: While Healthline strives for factual, comprehensive, and current information, this article is not a substitute for a licensed healthcare professional’s expertise. Always consult a doctor before taking or discontinuing any medication. Drug information is subject to change and may not cover all uses, directions, precautions, warnings, interactions, reactions, or adverse effects. The lack of a warning does not guarantee a drug’s safety, effectiveness, or appropriateness for all patients or specific uses. Learn more about our approach to content integrity.