Avacopan - Uses, Side Effects and Precautions

Overview:

Avacopan is a capsule that treats active anti-neutrophil cytoplasmic autoantibody (ANCA)- associated vasculitis (granulomatosis with polyangiitis and microscopic polyangiitis). It is administered in conjunction with steroids. Avacopan can only be purchased with a prescription from a physician. Avacopan received FDA (Food and Drug Administration) approval on October 7, 2021. The FDA recommended standard therapy, including glucocorticoids, for treating patients with severe active ANCA-associated vasculitis (granulomatosis with polyangiitis and microscopic polyangiitis).

Ingredients:

• Active component - Avacopan.

• Inactive substances - Polyoxyl-40 hydrogenated castor oil and polyethylene glycol 4000 (PEG-400).

For Patients:

Why Is Avacopan Prescribed?

Avacopan is used to treat microscopic polyangiitis (MPA) and granulomatosis with polyangiitis (a condition leading to inflammation of the blood vessels), two types of ANCA-associated vasculitis. Adults with active and severe symptoms can use Avacopan as an adjuvant treatment when taking other medications. Avacopan prevents the blood from binding to the immune system receptor called component 5a. Avacopan prevents the blood from binding to an immune system receptor (C5a). This medication can also help to decrease blood vessel inflammation and lower the symptoms of the disease when it blocks the C5a receptors. Avacopan is also considered an antagonist of the complement 5a receptor (C5aR).

Dosage:

The standard adult dosage of Avacopan for ANCA-associated vasculitis is 30 milligrams (mg), or three 10 mg capsules, taken twice a day with food.

How to Administer Avacopan?

Take two capsules of Avacopan daily, in the morning and the evening, with food. The capsule has to be swallowed entirely with water. The medication must be administered as directed by the healthcare professional. The treatment must not be discontinued without consulting the healthcare professional. If an individual is doubtful about how to take the medication, consult the doctor or the pharmacists.

What Are the Side Effects of Avacopan?

Common Side Effects:

Side effects from Avacopan that are often reported include:

• Nausea.

• Fatigue.

• Vomiting.

• Diarrhea.

• Headache.

• Rash.

• Dizziness.

• Stomach discomfort.

• Blurred vision.

• Severe headache.

• Burning or prickling sensation.

• Pounding in the ears or neck.

• An increase in blood creatinine.

Usage:

In conjunction with normal therapy, including glucocorticoids, as an adjuvant for adult patients with severe active anti-neutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis.

What to Do in Case of Missed Dose?

Take the next dose at the scheduled time and skip the missing dose. Take only one dose at a time.

Storage

• This medication must be stored between 68 and 77 degrees Fahrenheit (20 and 25 degrees Celsius).

• Keep all medications out of children's and animals' reach.

For Doctors:

Serious Adverse Effects:

If a patient shows any allergic reaction like hives, trouble breathing, or swelling in the lips, tongue, or throat, emergency medical help must be contacted immediately:

Do not take this medication if a patient is allergic to inactive substances, including Avacopan.

More harmful side effects with Apacopan include

• Loss of appetite.

• Pain or swelling in the stomach.

• Swelling in the legs.

• Easy bleeding.

• Drowsiness.

• Confusion.

• Jaundice (yellowing of the skin or eyes) is a symptom of liver problems.

Symptoms of serious infections include

• Fever.

• Sore throat.

• Runny nose.

• Flu.

• Headache.

• Earache.

• Cold sores in the mouth or throat.

• Painful urination.

Precautions:

The individual must consider the potential benefits and hazards while choosing which medication to take; one must consider both the potential hazards and benefits. The patient must consult the doctor to make the right decision. The following must be considered before taking this medication.

Allergy:

If the patient has ever experienced an unexpected or adverse reaction to this or any other medication, inform the doctor immediately. The healthcare professional must also be informed about any other allergies an individual might have, including those to foods, colors, preservatives, or animals. Review the ingredients listed on the label or container of non-prescription products carefully.

Pediatric:

Appropriate studies have not examined the link between age and the effects of Avacopan in the pediatric population, and the drug's efficacy and safety have yet to be proven.

Geriatric:

Appropriate studies have not yet shown any issues unique to the elderly that would restrict the benefits of Avacopan.

Breastfeeding: Insufficient research on women has been done to assess the harm to the unborn child when this medicine is used while nursing, before using this drug while nursing, to balance the possible advantages against the potential disadvantages.

What Are the Drug Interactions?

While some medications should never be combined, there are other situations in which two distinct medications can be taken together, even though there may be an interaction. The doctor might advise adjusting the dosage or suggesting other safety measures in certain circumstances. The healthcare provider must be made aware of any medication the patient takes.

It is usually not recommended to use this medication with the following medications; however, it might be necessary to prescribe them under certain circumstances. If both medications are to be prescribed together, then the dose or the frequency might be adjusted accordingly.

• Abemaciclib.

• Acalabrutinib.

• Alfentanil.

• Apalutamide.

• Astemizole.

• Axitinib.

• Bosentan.

• Boceprevir.

• Brigatinib.

• Bosutinib.

• Budesonide.

• Carbamazepine.

• Cenobamate.

• Cisapride.

• Clarithromycin.

• Ceritinib.

• Clindamycin.

• Cobicistat.

• Colchicine.

• Conivaptan.

• Cobimetinib.

• Crizotinib.

• Cyclosporine.

• Dasatinib.

• Dihydroergotamine.

• Dihydrocodeine.

• Docetaxel.

• Dronedarone.

• Dofetilide.

• Efavirenz.

• Entrectinib.

• Ergotamine.

• Enzalutamide.

• Etravirine.

• Everolimus.

• Fentanyl.

• Flibanserin.

• Fedratinib.

• Fosphenytoin.

• Idelalisib.

• Indinavir.

• Ivosidenib.

• Itraconazole.

• Ketoconazole.

• Levomethadyl.

• Lopinavir.

• Lorlatinib.

• Lomitapide.

• Lumacaftor.

• Mavacamten.

• Methadone.

• Midostaurin.

• Meperidine.

• Mitotane.

• Modafinil.

• Nafcillin.

• Nefazodone.

• Neratinib.

• Nilotinib.

• Nelfinavir.

• Oxycodone.

• Olaparib.

• Omaveloxolone.

• Pazopanib.

• Paclitaxel.

• Phenobarbital.

• Phenytoin.

• Pimavanserin.

• Posaconazole.

• Primidone.

• Pimozide.

• Quinidine.

• Quinine.

• Ribociclib.

• Rifampin.

• Rifabutin.

• Ritonavir.

• Ruxolitinib.

• Roflumilast.

• Sirolimus.

• Saquinavir.

• Sonidegib.

• Sufentanil.

• St John's Wort.

• Sunitinib.

• Tacrolimus.

• Telaprevir.

• Tamoxifen.

• Telithromycin.

• Tolvaptan.

• Temsirolimus.

• Tramadol.

• Voriconazole.

• Zanubrutinib.

Which Other Medications Interact With Avacopan?

Inform the doctor about the medications being taken, including over-the-counter (OTC) medications, vitamins, and herbal supplements. Avacopan and several other medications might interact negatively and lead to adverse effects. The patient is advised to list all the medications taken and hand them to the pharmacy or the doctor. It is advised that Avacopan must not be used with certain medications. The healthcare professional can recommend additional medicines to treat the illness. Since various interactions might occur, certain medicines must not be administered immediately after consuming specific foods or at certain times of the day. Interactions might occur between some medicines and alcohol or tobacco. Consult a healthcare provider regarding using these medications with food, drink, or tobacco with the healthcare provider.

Other Health Issues

Other medical issues might impact the use of this medication. The individual must ensure that the physician is aware of any other comorbidities, such as severe, active infection or severe, untreated, or uncontrolled liver disease, such as cirrhosis, hepatitis B, or C. Use is not advised in patients suffering from these conditions. A weak immune system can increase the risk of severe infection.

Precautions:

It is considered extremely important to undergo regular check-ups to ensure the medications work adequately. Blood and urine tests must be carried out to assess the side effects. If the patient experiences any of the following symptoms, consult the doctor straight away:

• Pale stools.

• Dark urine.

• Lack of appetite.

• Nausea.

• Vomiting.

• Yellow eyes or skin.

• Pain or soreness in the upper abdomen.

These may indicate a severe liver condition (like hepatitis B).

Serious allergic responses, such as angioedema, can be fatal from this medication and need to be treated right once. If one has big, hive-like swelling on the face, lips, tongue, neck, hands, legs, feet, or sex organs, consult the doctor immediately. This medication may raise the risk of infection both during and after treatment. While using this medication, stay away from those who are ill or infected. Hands-wash frequently. Before starting this medication, disclose any history of infection or lupus to the doctor.

Further, let the doctor know if you have ever experienced recurrent infections or infections that will not go away. Do not take any more medications without talking to the doctor about them. This includes over-the-counter (OTC) medications, prescription medications, and vitamin and herbal supplements.

Adverse Effects

A medication may have some undesirable side effects besides its intended ones. While not all of these adverse effects are likely to happen, they can require medical treatment if they do.

If one has any of the following side effects, consult the doctor right away:

• Pain in the bladder.

• Urine that is murky or bloody.

• Stiffness or pain in the chest.

• Cough, dark urine burning, or uncomfortable urination.

• Chills or a fever.

• Frequent need to go to the bathroom due to loss of appetite.

• Side or lower back pain.

• Feeling queasy or throwing up.

• Sneeze, sore throat, stomach ache, acute dyspnea, abnormal fatigue, or weakness.

• Yellow skin or eyes.

• Extensive, beehive-like swelling on the hands, legs, feet, tongue, neck, eyelids, lips, or genital organs.

Certain adverse effects may be normally not serious enough to require medical treatment. These adverse effects can disappear as the body gets used to the medicine. In addition, the healthcare provider can guide the patient on reducing or avoiding some of these adverse effects. If any of the following side effects continue, consult the healthcare provider:

• Sensations like burning, itchiness, numbness, prickliness, or tingling.

• Dizziness diarrhea.

• Headache.

• Rash on the skin.

Certain patients may also experience other adverse effects that are not mentioned. Consult the healthcare provider if there are any further consequences.

What Are the Pharmacological Actions of Avacopan?

Mechanism of Action:

The complement 5a receptor (C5aR) antagonist Amoxopan prevents the anaphylatoxin C5a from interacting with C5aR. Avacopan inhibits the activation and migration of neutrophils mediated by C5a. There is currently no conclusive evidence regarding the exact mechanism through which Avacopan treats patients with ANCA-associated vasculitis.

Pharmacodynamics:

On human neutrophils dosed with Avacopan, C5a-induced upregulation of CD11b (integrin alpha M) is blocked by Avacopan. Uncertainty surrounds the pharmacodynamic effect's clinical importance. Electrophysiology of the heart does not lengthen the QT interval to a clinically significant degree when taken at the authorized recommended dosage.

Pharmacokinetics:

Patients with ANCA-associated vasculitis receiving 30 mg Avacopan twice daily had mean steady-state plasma exposure estimates of 3466 ± 1921 ng/mL for the 12-hour area under the plasma drug concentration over time curve (AUC0-12hr) and 349 ± 169 ng/mL for the maximum plasma concentration (Cmax) based on population pharmacokinetic analysis. After 13 weeks, Avacopan plasma levels approach a steady state, and the buildup is about four times higher.

• Absorption: When 30 mg of Avacopan in capsule form is taken along with a high-fat, high-calorie meal, the drug's AUC and Cmax rise by about 72 and eight percent, respectively, and the Tmax is delayed by about four hours (from two hours to six hours).

• Distribution: Over 99.9 percent of Avacopan and metabolite M1 bind to plasma proteins, such as albumin and α1-acid glycoprotein. It is calculated that Avacopan has an apparent dispersion volume of 91.14 US gallons.

• Elimination: Based on population pharmacokinetic analysis, the estimated total apparent body clearance (CL/F) of Avacopan is 16.3 L/h. Following a dose of 30 mg of Avacopan with food, the mean elimination half-lives of Avacopan and M1 are 97.6 hours and 55.6 hours, respectively, in healthy subjects.

• Metabolism: The primary enzyme, CYP3A4, is in charge of clearing Avacopan and forming and eliminating M1, Avacopan's mono-hydroxylated product, which is the main circulating metabolite. M1 has about the same activity as Avacopan on the C5aR and was found in plasma at approximately 12 percent of all drug-related materials.

• Excretion: The primary method of removing Avacopan is metabolism, followed by the metabolites' biliary excretion into a stool. After taking radiolabelled Avacopan orally, approximately 77 and 10 percent of the radioactivity was found in the feces and urine, respectively, and seven percent and less than 0.1 percent of the radioactive dosage was found in the feces and urine as unaltered Avacopan.