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Manufactured by Concordia Pharmaceuticals

*You can pay as little as $0 per fill using Drug Coupons or Patient Assistance Programs. Subject to applicability & eligibility requirements.

This content is intended for US audiences only

PLAQUENIL cost saving options available to you

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    Canadian Prescription Savings

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    Drug Coupons

    Obtain your PLAQUENIL for as little as $0 per fill. Suitable for insured individuals only.
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    Patient Assistance Programs

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PLAQUENIL Uses, Side Effects, Interactions, Warnings & Dosing



PLAQUENIL is the brand name for hydroxychloroquine and is available as an oral tablet.

What dosages is PLAQUENIL available in?

What dosages is PLAQUENIL available in?

PLAQUENIL is available as a 100 mg, 200 mg, 300 mg, and 400 mg oral tablet.

What is PLAQUENIL used for?

What is PLAQUENIL used for?

PLAQUENIL is an anti-malarial agent and is used to treat the following:

  • Uncomplicated malaria in adults and children
  • Rheumatoid arthritis (RA) in adults
  • Systemic lupus erythematosus (SLE) in adults
  • Discoid lupus erythematosus (DLE) in adults
How does PLAQUENIL work?

How does PLAQUENIL work?

PLAQUENIL is a disease-modifying anti-rheumatic drug (DMARD) used to treat inflammatory problems. It’s thought to work by blocking certain processes in the immune system. This helps prevent the immune system from being too active. PLAQUENIL is also an antimalarial. It’s not exactly known how PLAQUENIL, but it’s thought to kill malaria by stopping several cellular processes that are needed for it to grow and survive.

How do I take PLAQUENIL?

How do I take PLAQUENIL?

PLAQUENIL is typically taken by mouth with food or milk as a single dose or in 2 smaller doses. Your dose will be determined based on the condition being treated. Your child’s provider will determine their dose based on your child’s body weight.

Is it safe for me to take PLAQUENIL?

Is it safe for me to take PLAQUENIL?

PLAQUENIL is a safe and effective treatment when used for FDA licensed indications. However, like all medications, they may give you unwanted side effects. You should always discuss potential side effects with your physician to ensure the medication is suitable and right for you. You should not use this medication if you have a known hypersensitivity to 4­
aminoquinoline compounds.

PLAQUENIL Common Side Effects

PLAQUENIL Common Side Effects

Common side effects of PLAQUENIL:

  • Nausea and vomiting
  • Diarrhea
  • Bloating
PLAQUENIL Serious Side Effects

PLAQUENIL Serious Side Effects

Serious side effects are rare with PLAQUENIL. Contact your healthcare provider immediately if you experience any of the following.

  • Abnormal heart rhythm (QT prolongation): chest pounding, short of breath, chest pain, feeling faint or lightheaded
  • Serious allergic and skin reactions: sore throat, fever, fatigue, rash, hives, painful blisters, skin reddening, skin peeling, difficulty breathing, itching, fast heartbeat, tightness in the throat, swelling in the face or tongue
  • Hemolytic anemia (low red blood cell count): tiredness, dizziness, weakness, high heart rate, yellowing of the skin or eyes, dark-colored urine
  • Bleeding: blood in your urine or stool, unexplained bruising, bleeding that takes longer than usual to stop
  • Serious infections: fever, difficulty breathing, diarrhea, weakness, cough, stomach pain, sweating, chills, burning when you urinate, urinating more often
  • Suicidal thoughts or behaviors: thoughts of harming yourself or others, depressed mood
  • Severely low blood sugar: dizziness, shakiness, feeling confused, feeling irritable or anxious, feeling faint, sweating, extreme hunger
Effects of other drugs, drug classes and over-the-counter products on PLAQUENIL

Effects of other drugs, drug classes and over-the-counter products on PLAQUENIL

The following medications may interact with PLAQUENIL:

  • Digoxin: Concomitant PLAQUENIL and digoxin therapy may result in increased serum digoxin levels: serum digoxin levels should be closely monitored in patients receiving combined therapy
  • Insulin or antidiabetic drugs: As PLAQUENIL may enhance the effects of a hypoglycemic treatment, a decrease in doses of insulin or antidiabetic drugs may be required
  • Drugs that prolong QT interval and other arrhythmogenic drugs: PLAQUENIL prolongs the QT interval and should not be administered with other drugs that have the potential to induce cardiac arrhythmias. Also, there may be an increased risk of inducing ventricular arrhythmias if PLAQUENIL is used concomitantly with other arrhythmogenic drugs
  • Mefloquine and other drugs known to lower the convulsive threshold: PLAQUENIL can lower the convulsive threshold. Co-administration of PLAQUENIL with other antimalarials known to lower the convulsion threshold (e.g., mefloquine) may increase the risk of convulsions
  • Antiepileptics: The activity of antiepileptic drugs might be impaired if co-administered with PLAQUENIL.
  • Methotrexate: Combined use of methotrexate with PLAQUENIL has not been studied and may increase the incidence of adverse effects
  • Cyclosporin: An increased plasma cyclosporin level was reported when cyclosporin and PLAQUENIL were co-administered
Who makes PLAQUENIL?

Who makes PLAQUENIL?

Concordia Pharmaceuticals

Is PLAQUENIL safe in pregnancy?

Is PLAQUENIL safe in pregnancy?

It is not known if PLAQUENIL will harm your unborn baby. You should talk to your healthcare provider before taking this medication if you are pregnant.


What to do if you missed your PLAQUENIL dose

The FDA's medical product safety reporting program for health professionals, patients and consumers.

Learn more about reporting side effects
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Medical Disclaimer

NowPatient has taken all reasonable steps to ensure that all material is factually accurate, complete, and current. However, the knowledge and experience of a qualified healthcare professional should always be sought after instead of using the information on this page. Before taking any drug, you should always speak to your doctor or another qualified healthcare provider.

The information provided here about medications is subject to change and is not meant to include all uses, precautions, warnings, directions, drug interactions, allergic reactions, or negative effects. The absence of warnings or other information for a particular medication does not imply that the medication or medication combination is appropriate for all patients or for all possible purposes.

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