Acthar Gel (corticotropin): Uses, Side Effects, Interactions, Pictures, Warnings & Dosing

Note: This article is for educational purposes only and is based on current U.S. prescribing information and reputable medical references. It is not a substitute for medical advice, diagnosis, or treatment. Acthar Gel is a prescription medicine that should be used only under the supervision of a licensed healthcare professional.

Acthar Gel, also known as repository corticotropin injection or simply corticotropin, is one of those medications that sounds like it escaped from a graduate-level biology textbook wearing a lab coat. But behind the complicated name is a real prescription treatment used for certain inflammatory, autoimmune, neurologic, eye, lung, skin, and kidney-related conditions. It is also used as monotherapy for infantile spasms in infants and children under 2 years of age.

Unlike a daily vitamin or an over-the-counter pain reliever, Acthar Gel is not something people casually add to their routine between coffee and brushing their teeth. It is an injectable medication with specific uses, important warnings, careful dosing rules, and possible side effects that deserve serious attention. This guide explains what Acthar Gel is, how it is used, what it looks like, possible side effects, drug interactions, warnings, and practical treatment experiences patients and caregivers may want to understand.

What Is Acthar Gel?

Acthar Gel is a brand-name prescription form of repository corticotropin injection. Corticotropin is related to adrenocorticotropic hormone, often shortened to ACTH. ACTH signals the adrenal glands to produce natural steroid hormones such as cortisol, corticosterone, and aldosterone. These hormones can affect inflammation, immune activity, fluid balance, blood pressure, and metabolism.

Acthar Gel is called a “repository” injection because it is made as a gel preparation designed for prolonged release after injection. In plain English, it is not meant to disappear from the body instantly. It is formulated to release medication over time after it is injected under the skin or into a muscle, depending on the condition and product form used.

Acthar Gel is available as a multi-dose vial and as single-dose pre-filled SelfJect injectors. The vial may be used for intramuscular or subcutaneous injection, while the pre-filled SelfJect injector is for subcutaneous use by adults only. The medication itself is described as a clear, light amber solution that becomes mobile at room temperature.

How Acthar Gel Works

Acthar Gel works mainly by stimulating the adrenal cortex, the outer part of the adrenal glands, to produce steroid hormones. These hormones can help reduce inflammation and modify immune-system activity. That is why Acthar Gel may be considered for certain autoimmune and inflammatory diseases, including systemic lupus erythematosus, dermatomyositis, rheumatoid arthritis, psoriatic arthritis, and inflammatory eye diseases.

However, the exact way Acthar Gel works in all approved conditions is not fully understood. In infantile spasms, for example, the mechanism is listed as unknown. Acthar Gel is also reported to bind to melanocortin receptors, which may play a role in immune and inflammatory pathways. Translation: researchers understand several important pieces of the puzzle, but the full picture is still more “medical mystery novel” than “assembly instructions for a bookshelf.”

Acthar Gel Uses

Acthar Gel has several FDA-approved uses. It is not used for every person with these conditions, and it is often considered when a healthcare provider believes it is appropriate based on disease severity, previous treatments, and overall health.

Infantile Spasms

Acthar Gel is indicated as monotherapy for the treatment of infantile spasms in infants and children under 2 years of age. Infantile spasms are a serious seizure disorder that requires urgent medical evaluation. Treatment decisions are usually made by pediatric neurologists or specialists experienced in managing seizure disorders in infants.

Multiple Sclerosis Relapses

Acthar Gel is approved for the treatment of acute exacerbations of multiple sclerosis in adults. Clinical trials have shown that it may speed the resolution of acute MS exacerbations. However, it has not been shown to change the long-term outcome or natural history of multiple sclerosis. In other words, it may help a flare calm down faster, but it is not considered a cure or disease-modifying therapy for MS.

Rheumatic Disorders

Acthar Gel may be used as short-term adjunctive therapy for acute episodes or exacerbations of certain rheumatic disorders, including psoriatic arthritis, rheumatoid arthritis, selected cases of juvenile rheumatoid arthritis, and ankylosing spondylitis. “Adjunctive” means it is added to a broader treatment plan rather than strolling in as the lone superhero.

Collagen Diseases

Acthar Gel may be used during an exacerbation or as maintenance therapy in selected cases of systemic lupus erythematosus and systemic dermatomyositis, also known as polymyositis. These conditions involve immune-system activity that can affect joints, skin, muscles, organs, and overall quality of life.

Dermatologic, Allergic, Eye, Lung, and Kidney Conditions

Other approved uses include severe erythema multiforme, Stevens-Johnson syndrome, serum sickness, severe allergic and inflammatory eye diseases, symptomatic sarcoidosis, and nephrotic syndrome without uremia of idiopathic type or related to lupus erythematosus. Because these conditions can be complex and serious, Acthar Gel is usually part of specialist-guided care.

Acthar Gel Pictures: What Does It Look Like?

People often search for “Acthar Gel pictures” because injectable medications can be intimidating, and it helps to know what you are looking at before you open the carton and start wondering whether the refrigerator has become a tiny pharmacy.

Acthar Gel is supplied as a clear, light amber solution. The multi-dose vial contains 80 USP units per mL and is supplied as 400 USP units in 5 mL. The single-dose pre-filled SelfJect injector is available in 40-unit and 80-unit strengths for subcutaneous injection. The medication should not be used if it appears cloudy, discolored, or contains particulate matter. If the appearance seems unusual, contact a pharmacist or healthcare provider before using it.

Acthar Gel Dosing

Acthar Gel dosing depends on the condition being treated, the patient’s age, severity of disease, treatment response, and the route of administration. Never change the dose, skip tapering instructions, or stop suddenly without medical guidance.

Dosing for Infantile Spasms

For infantile spasms in infants and children under 2 years old, Acthar Gel must be given intramuscularly using the vial. The recommended regimen is 150 units per square meter per day, divided into twice-daily intramuscular injections of 75 units per square meter for 2 weeks. After that, dosing should be gradually tapered over 2 weeks to reduce the risk of adrenal insufficiency.

The single-dose pre-filled SelfJect injector should not be used for infantile spasms. Caregivers should receive hands-on training and clear written instructions from the child’s healthcare team.

Dosing for Acute MS Exacerbations

For adults with acute multiple sclerosis exacerbations, the recommended dose is 80 to 120 units daily by intramuscular or subcutaneous injection for 2 to 3 weeks. The dose and frequency should be individualized based on the person’s condition and response.

Dosing for Other Approved Indications

For adults and children over 2 years of age using Acthar Gel for other approved indications, dosing is individualized. The usual dose is 40 to 80 units given intramuscularly or subcutaneously every 24 to 72 hours. In some cases, the prescriber may taper the dose or increase the injection interval when treatment is being stopped.

How Acthar Gel Is Given

Acthar Gel may be injected either under the skin or into a muscle, depending on the product form and indication. The multi-dose vial may be used for intramuscular or subcutaneous injection. The single-dose SelfJect injector is for subcutaneous injection only and is approved for use by adults.

Before injection, the medication should be allowed to warm to room temperature. The pre-filled SelfJect injector should sit out for about 45 minutes before use. Do not heat it in a microwave, under hot water, or with any other “creative” shortcut. This is medicine, not leftover pizza.

Subcutaneous injections may be given in the upper thigh, abdomen, or back of the arm. Injection sites should be rotated, and the same site should not be used more than once per week. Avoid skin that is irritated, scarred, bruised, tattooed, or affected by stretch marks, birthmarks, warts, or other changes.

Common Side Effects of Acthar Gel

Acthar Gel side effects are related largely to its steroid-like effects in the body. Commonly reported adverse reactions include injection site reactions, fatigue, malaise, lethargy, fluid retention, swelling, insomnia, headache, and increased blood glucose.

In infants treated for infantile spasms, the most common side effects reported at 5% or greater in the recommended twice-daily dosing group include increased risk of infection, convulsions, high blood pressure, irritability, and fever. Other possible effects include diarrhea, vomiting, increased or decreased appetite, weight gain, acne, rash, nasal congestion, and Cushingoid features.

Serious Side Effects and When to Get Help

Serious side effects can occur with Acthar Gel. Contact a healthcare provider right away or seek emergency care for signs of severe infection, allergic reaction, gastrointestinal bleeding, unusual mood changes, severe depression, vision changes, swelling of the face or throat, trouble breathing, black or bloody stools, vomiting blood, severe stomach pain, fainting, chest symptoms, or new or worsening seizures.

Acthar Gel may increase susceptibility to infections, including viral, bacterial, fungal, protozoal, and parasitic infections. It may worsen existing infections or reactivate latent infections such as tuberculosis. Because it can mask symptoms, a person may be sicker than they appear, which is one of the less charming tricks inflammation-modulating medicines can perform.

Important Warnings

Adrenal Suppression and Cushing’s Syndrome

Acthar Gel can suppress the hypothalamic-pituitary-adrenal axis and may cause Cushing’s syndrome, especially with longer use. Possible signs include weight gain, rounder face, increased fat around the trunk or neck, stretch marks, easy bruising, muscle weakness, high blood sugar, and high blood pressure. Sudden withdrawal after prolonged treatment may lead to adrenal insufficiency, so tapering may be needed.

Blood Pressure, Fluid Retention, and Potassium Loss

Acthar Gel can raise blood pressure, cause salt and water retention, and increase the loss of potassium and calcium. People with high blood pressure, kidney problems, or fluid-retention risks may need closer monitoring. A low-sodium diet or potassium supplementation may be recommended by the healthcare provider.

Vaccines

Live or live-attenuated vaccines are contraindicated in patients receiving immunosuppressive doses of Acthar Gel. Inactivated vaccines may be given, but the immune response may be unpredictable. Always tell healthcare providers about Acthar Gel before receiving vaccines.

Stomach and Intestinal Risks

Acthar Gel can increase the risk of gastric ulcers, gastrointestinal bleeding, and perforation. It may also mask signs of irritation or infection in the abdomen. People with a history of peptic ulcer disease, recent intestinal surgery, diverticulitis, abscess, or other gastrointestinal concerns should discuss these risks carefully.

Mood and Behavior Changes

Behavioral and mood changes can occur, including irritability, insomnia, euphoria, mood swings, personality changes, severe depression, and psychosis. Patients and caregivers should report major emotional or behavioral changes promptly.

Eye Effects and Bone Health

Long-term use may increase the risk of cataracts, glaucoma, increased eye pressure, osteoporosis, decreased bone density, and impaired growth in children. Pediatric patients receiving prolonged therapy should have growth and physical development monitored carefully.

Who Should Not Use Acthar Gel?

Acthar Gel is contraindicated for intravenous administration. It should not be used in infants under 2 years of age with suspected congenital infections. It is also contraindicated with live or live-attenuated vaccines in patients receiving immunosuppressive doses.

Acthar Gel should not be used in patients with certain conditions, including scleroderma, osteoporosis, systemic fungal infections, ocular herpes simplex, recent surgery, current or past peptic ulcer, congestive heart failure, uncontrolled high blood pressure, primary adrenocortical insufficiency, adrenocortical hyperfunction, or sensitivity to proteins of porcine origin.

Acthar Gel Drug Interactions

Formal drug-drug interaction studies have not been performed for Acthar Gel. However, it may increase electrolyte loss associated with diuretics, sometimes called water pills. This matters because Acthar Gel can already affect potassium and fluid balance.

Patients should tell their doctor and pharmacist about all prescription drugs, over-the-counter medicines, vitamins, supplements, and herbal products they use. Special attention may be needed for diuretics, blood pressure medications, diabetes medications, vaccines, immunosuppressants, and other drugs that affect infection risk, fluid balance, mood, bones, or blood sugar.

Pregnancy and Breastfeeding

Acthar Gel may cause fetal harm when used during pregnancy. Corticosteroid-related effects such as intrauterine growth restriction, low birth weight, preterm birth, and hypoadrenalism in infants have been reported with systemic corticosteroid use, which may be relevant to Acthar Gel’s pharmacologic effects. People who are pregnant, planning pregnancy, or could become pregnant should discuss risks and alternatives with their prescriber.

There are no available data on whether corticotropin is present in human milk, how it may affect a breastfed infant, or whether it affects milk production. Breastfeeding decisions should balance the parent’s need for treatment, the benefits of breastfeeding, and possible risks to the infant.

Storage and Handling

Acthar Gel should be stored in the refrigerator between 36°F and 46°F and kept in the carton to protect it from light. The single-dose pre-filled SelfJect injector may be kept at room temperature between 68°F and 77°F for up to 24 hours after removal from the refrigerator. Do not freeze it, heat it, or leave it in direct sunlight.

Practical Experiences With Acthar Gel Treatment

People’s experiences with Acthar Gel vary widely because the medication is used for very different conditions. A parent managing infantile spasms, an adult recovering from an MS relapse, and a person with lupus symptoms are not walking the same medical road, even if the same brand name appears on the prescription label.

One common experience is that Acthar Gel often comes with a learning curve. Patients or caregivers may need training on injection technique, storage, site rotation, and safe disposal of sharps. The first injection can feel intimidating. Many people report that the process becomes less stressful once they establish a routine: remove the medication from the refrigerator, allow it to reach room temperature, inspect it, prepare supplies, clean the skin, inject as instructed, and document the date and injection site.

Another real-world issue is monitoring. Acthar Gel is not a “take it and forget it” medication. Blood pressure checks, blood sugar monitoring, infection awareness, weight tracking, and symptom diaries may all become part of the treatment experience. For some patients, this feels like a lot at first. A practical tip is to keep a simple log with the dose, time, injection site, symptoms, side effects, and questions for the next appointment. It does not need to be fancy. A notebook, phone note, or medication app can work. The goal is to prevent the classic appointment moment where the doctor asks, “Any changes?” and your brain immediately becomes a blank whiteboard.

Side effects may shape the experience as much as symptom improvement. Some patients may notice swelling, sleep changes, appetite changes, mood shifts, acne, headache, or higher blood pressure. Caregivers of infants may be asked to watch for fever, irritability, feeding changes, unusual tiredness, or new seizure activity. Because infection symptoms may be masked, subtle changes matter. A “small thing” can be worth reporting when a medicine affects immune response.

Cost and access can also be part of the Acthar Gel experience. This medication may require prior authorization, specialty pharmacy coordination, and insurance review. Patients may need help from the prescribing office, insurer, pharmacy, or manufacturer support program. The paperwork can feel like a side quest nobody requested, but early communication helps. Ask the care team who handles authorization, how refills are managed, what to do if a shipment is delayed, and whom to call after hours.

People using Acthar Gel for MS relapses may experience treatment as a short-term course aimed at helping a flare resolve. They should understand that faster recovery from a relapse does not mean the medication changes long-term MS progression. Disease-modifying therapy decisions remain a separate conversation with a neurologist.

For autoimmune or inflammatory conditions such as lupus, dermatomyositis, or arthritis, Acthar Gel may be considered when symptoms flare or when selected maintenance therapy is appropriate. Patients often benefit from asking clear questions: What is the treatment goal? How soon should improvement be noticeable? What side effects should trigger a call? How long will treatment continue? What monitoring is planned? And most importantly, what is Plan B if Acthar Gel does not work or is not tolerated?

Caregivers and patients should also prepare for tapering. Stopping suddenly after prolonged use can lead to adrenal insufficiency or symptom recurrence. If the prescriber gives a taper schedule, follow it carefully. Tapering may not feel dramatic, but it is one of the most important safety steps with this medication.

The best Acthar Gel experience is usually organized, informed, and closely supervised. Keep the care team in the loop, report side effects early, store the medication correctly, rotate injection sites, and do not improvise with dosing. Medical treatment is not jazz; this is not the place for spontaneous solos.

Conclusion

Acthar Gel (corticotropin) is a specialized prescription injectable medication used for infantile spasms, acute MS exacerbations, and selected inflammatory, autoimmune, eye, lung, skin, rheumatic, and kidney-related conditions. It can be helpful in appropriate patients, but it also carries important risks, including infection, adrenal suppression, high blood pressure, fluid retention, mood changes, gastrointestinal bleeding, eye problems, bone loss, growth effects in children, and pregnancy-related concerns.

Because dosing varies by condition and patient, Acthar Gel should be used exactly as prescribed. Patients and caregivers should understand how to store it, what it looks like, how it is injected, when to seek help, and why tapering may be necessary. The safest approach is simple: ask questions early, monitor carefully, and keep your healthcare team fully informed.