Hydroxychloroquine in Lupus Nephritis: Dosage, Effectiveness, and Side Effects

Introduction

Lupus nephritis is a disease where the body’s defense system attacks itself by mistake. It causes harm to the kidneys. Hydroxychloroquine is a medicine that can help protect the kidneys and prevent lupus from getting worse. It works by calming down the immune system so it does not attack the body as much. This article will discuss how this medicine helps, how much to take, and the side effects to watch out for.

Drug Overview

Hydroxychloroquine is an antimalarial medication licensed to treat lupus nephritis. It reduces the frequency and intensity of lupus flares, providing advantages beyond its intended aim. The FDA (U.S. Food and Drug Administration) approved it as an oral medication to treat lupus in 1955.

For Patients:

What Is Hydroxychloroquine?

Hydroxychloroquine was initially developed to treat malaria, a disease transmitted by mosquitos. Today, medical practitioners utilize this medication to help persons with lupus. Lupus is a disorder in which the body's immune system becomes confused and incorrectly targets healthy cells. Hydroxychloroquine is a shield that helps calm the body's defense system so that it no longer fights against itself. The shield helps to protect different areas of the body, including the joints, skin, and kidneys, from damage. The patients generally take it as a tablet.

What Are the Approved Uses of Hydroxychloroquine?

• Malaria: It can cure and prevent malaria, a disease caused by mosquito bites.

• Rheumatoid Arthritis: It assists individuals with rheumatoid arthritis, an illness that causes their joints to be painful and inflamed.

• Systemic Lupus: It is prescribed for adults with systemic lupus, an illness in which the immune system mistakenly targets various parts of the body.

• Discoid Lupus: It also assists adults with discoid lupus, a form of lupus that results in red, scaly lesions on the skin.

How Does Hydroxychloroquine Work?

Hydroxychloroquine inhibits the immune cell communication in lupus patients. It lowers inflammation and keeps the immune system from attacking healthy tissues. It also reduces the incidence of lupus flares (a period of symptom worsening) and improves long-term results for people with lupus nephritis.

What Are the Benefits of Using Hydroxychloroquine for Lupus Nephritis?

• Less Lupus Flares: It keeps lupus flares from happening. So, these times occur less frequently and are not as severe.

• Preserve Kidneys: It maintains the kidneys healthy for individuals with lupus.

• Assists Individuals in Living Longer: Taking this drug for many years may help individuals with lupus live longer.

• Additional Benefits: It also prevents blood clotting and swelling.

What Is the Dosage and How to Take It?

• Dosage: 200 mg, 300 mg, or 400 mg each day (or in two doses). The doctor regulates the dosage, which depends on the patient's weight and requirements.

• How to Take It? - To minimize stomach upset, take Hydroxychloroquine with food. Tablets should be taken orally with milk or a meal. They should not be crushed.

What Are the Side Effects and Risks?

Hydroxychloroquine can cause side effects. Inform your doctor if any of the following occur and they are severe or continue for a long time:

• Headache.

• Loss of appetite.

• Nausea.

• Diarrhea.

• Pain in the stomach.

• Vomiting.

• Hearing difficulty.

• Ringing in ears.

• Hair loss.

• Change in hair color.

If any of the following occur, immediately call your doctor:

• Hives.

• Rash.

• Swelling of face.

• Trouble breathing or swallowing.

• Blisters on the lips, eyes, skin, or in the mouth;

• Burning or itching skin.

• Muscle weakness.

• Numbness, burning, or tingling in the hands or feet.

• Excessive fatigue.

• Loss of appetite.

• Nausea.

• Yellowing of the skin or eyes.

• Dark-colored urine.

• Stomach pain in the upper right side.

• Unusual bruising or bleeding.

• Cough.

• Fever.

• Sore throat.

• Runny nose or other infection signs.

• Mood or mental changes.

• Rapid or irregular heartbeat.

• Dizziness, lightheadedness, or fainting.

• Excessive or unusual weakness.

• Seizures.

• Changes in mood.

• Thought of harming or killing himself or herself.

• Not urinating normally or as often.

• Swelling of the legs, feet, or ankles.

• Shortness of breath.

• Fatigue.

• Fogginess.

• Confusion.

Other side effects may be seen with Hydroxychloroquine. Alert your doctor if you experience any unusual issues while taking this medicine.

Who Can Take Hydroxychloroquine?

• Most adults and children can take hydroxychloroquine. Hydroxychloroquine is generally safe for lupus patients but may not be appropriate for those with the following.

• Allergies to 4-aminoquinoline chemicals.

• Pre-existing retinal or visual issues.

• Severe liver or renal dysfunction.

What Are the Clinical Indications for Hydroxychloroquine?

• Treatment for systemic lupus erythematosus.

• Reducing renal inflammation through the management of lupus nephritis.

• Prevention of lupus complications.

What Is the Dosage of Hydroxychloroquine Tablets?

• Adults use 200 to 400 mg daily, divided into one or two doses.

• For pediatric use, the dose is estimated depending on body weight.

What Are the Things to Inform the Doctor About Before Taking the Drug?

• Inform your doctor if you have an allergy to Hydroxychloroquine or other medications.

• Inform your doctor of all the medicines, vitamins, and herbal remedies you are taking. Your doctor may need to alter the dose or monitor you for side effects.

• A drug known as Cimetidine may interact with Hydroxychloroquine. Inform your physician if you take it. Do not combine both drugs without consulting your physician.

• Take antacids (acidity medicine) four hours before or four hours after Hydroxychloroquine.

• Inform your physician if you or your family have experienced heart issues such as an abnormal heartbeat.

• Inform your physician if you have low potassium or magnesium, skin issues, blood issues, seizures, eye issues, diabetes, kidney or liver disease, or if you consume excessive alcohol.

• Inform your physician if you are pregnant, intend to become pregnant, or are breastfeeding.

• Hydroxychloroquine may lead to serious eye disorders. You may require frequent eye examinations. Inform your doctor if you notice blurry vision, spots, or light flashes.

• The medication may result in low blood sugar. Inform your doctor if you become dizzy, weak, tired, or experience a rapid or irregular heartbeat.

Missed Dose:

Take the missed dose as soon as possible. If it is almost time for the next dose, miss it; never double the dose.

Overdose:

Symptoms of an overdose are headache, eye and vision problems, and seizures. Call the doctor right away in the event of a suspected overdose.

Storage:

Store in a cool, dry place, and keep out of the reach of children.

For Doctors:

Indication:

• Treatment of malaria.

• Prophylaxis of malaria.

• Treatment of rheumatoid arthritis in adults.

• Treatment of systemic lupus erythematosus.

• Treatment of chronic discoid lupus erythematosus.

Dose:

The recommended Hydroxychloroquine dosage for lupus is 200 mg, 300 mg, or 400 mg once daily.

Dosing Considerations:

• 200 to 400 mg daily in a single dose or divided bid is employed for the management of lupus.

• Daily doses higher than 400 mg are not advisable.

• Though a larger dose could enhance the response, using greater than 400 mg daily is not advised owing to the danger of severe side effects.

• Breaking the dose in half is frequently better at providing a steady-state level of drug in the system than taking it all at once.

• For patients already on other drugs that influence the immune system, the initial dose of hydroxychloroquine can be adjusted to minimize the risk of side effects. A lower initial dose is typically advised.

• Take a lower dose if not tolerated in patients with kidney issues.

What Are the Pharmacological Aspects of Hydroxychloroquine?

Mechanism of Action:

We do not know how Hydroxychloroquine reduces inflammation and regulates the immune system in individuals with systemic, discoid, and rheumatoid arthritis.

Pharmacokinetics

• Absorption: The maximum drug concentrations were 50.3 ng/mL in plasma and 129.6 ng/mL in blood. Approximately 74 percent of the medication was taken up by the body.

• Distribution: Extensively distributed, especially in organs, including the kidneys, lungs, and liver.

• Metabolism: Plasma and blood contained significant amounts of three metabolites: bidesethylhydroxychloroquine (BDCQ), desethylhydroxychloroquine (DCQ), and desethylhydroxychloroquine (DHCQ), with DHCQ being the primary metabolite.

• Elimination: A plasma half-life of 123.5 days after a single 200 mg oral Hydroxychloroquine administration is seen. The drug is The drug is mostly eliminated by the kidneys. The half-life is between 30 and 50 days.

• Excretion: With chronic dosing, no alteration in clearance was seen. Renal clearance of unaltered drugs was around 16% to 30%.

Pharmacodynamics:

The safety and efficacy of Hydroxychloroquine have not yet been thoroughly described, nor have the exposure-response connection and time course of pharmacodynamic response.

Clinical Studies and Efficacy:

Clinical trials have shown that hydroxychloroquine retains renal function in people with lupus nephritis and greatly lowers the incidence of lupus flares. Prolonged use is linked to improved survival rates.

What Are the Contraindications of Hydroxychloroquine?

• Individuals who are extremely sensitive to 4-aminoquinoline substances.

Warnings and Precautions:

• Heart Issues: This medication can lead to major cardiac problems such as heart muscle damage (cardiomyopathy) and hazardous heart rhythms. These can be life-threatening.

• Eye Damage: It can cause serious and irreversible eye damage, especially if used over an extended period or at high doses. Regular eye examinations are suggested.

• Serious Skin Reactions: Some patients may get severe skin conditions such as rashes, blisters, or peeling skin.

• Worsening of Psoriasis and Porphyria: If you have psoriasis (a skin condition) or porphyria (a blood problem), avoid using this medication because it can exacerbate them.

• Blood Problems: Stop taking this medication if it produces low blood cell counts.

Specific Considerations

• Pregnancy: Hydroxychloroquine appears safe for both mother and baby during pregnancy. However, not treating malaria, arthritis, or lupus might be deadly.

• Nursing Mothers: A small quantity of Hydroxychloroquine may pass into breast milk, but it has not been shown to damage breastfed newborns. It does not appear to cause difficulties with the baby's eyes, ears, heart, growth, or development. We're not sure how it affects milk production.

• Children: Children with uncomplicated malaria can safely use Hydroxychloroquine. However, it is unclear whether it is safe for treating arthritis or lupus in youngsters.

• Geriatric Use: A lower dose may be necessary for older persons due to reduced kidney function. To avoid side effects, doctors normally start with the lowest dose possible.

• Renal Impairment: Patients with kidney or liver disorders may require a lower dose to avoid negative effects.

Is Hydroxychloroquine Better Than Other Treatments for Lupus Nephritis?

Hydroxychloroquine has a safer profile with fewer long-term negative effects than corticosteroids and immunosuppressants. It is frequently used in combination therapy to treat lupus nephritis fully. Hydroxychloroquine works well in treating lupus nephritis, mainly to decrease flares and preserve renal function. Still, it tends to be given with other therapies, such as corticosteroids and immunosuppressants, but not to the latter's exclusion. Treatment should be based on disease severity and the individual patient's requirements. Doctor advice is necessary to plan the best therapy combination.

What Are The Latest Research and Updates About Hydroxychloroquine?

In the past, Hydroxychloroquine was not considered significant in treating lupus. However, nowadays, it is regarded as an essential drug for individuals with lupus. Hydroxychloroquine can prevent flare-ups, minimize long-term damage, and prevent blood clots and heart issues. This drug can enhance the effectiveness of other lupus medications in individuals with kidney problems.

Conclusion

Hydroxychloroquine is recommended for most people with lupus, whether mild, moderate, or severe. Because of the drug's vast and diversified positive effects and excellent long-term safety record, most rheumatologists believe that people with lupus should take it throughout their lives. Hydroxychloroquine is still used to treat lupus nephritis because it can minimize flare-ups and preserve renal function. Regular monitoring and adherence to suggested dosages are critical for achieving maximum benefit and avoiding complications.

Key Takeaway/ Note from Icliniq

Hydroxychloroquine is a useful and generally safe treatment for lupus nephritis. Doctors at iCliniq provide expert advice on managing lupus using Hydroxychloroquine, with an emphasis on symptom control and flare-up prevention. Our expert panel of specialist doctors will provide personalized care plans, including the safe and effective use of Hydroxychloroquine, and ensure lupus patients' optimal health and well-being.