Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to Plaquenil: methotrexate, Lupus


trademark for a preparation of hydroxychloroquine, an antiinflammatory and antiprotozoal agent used for treatment of malaria, lupus erythematosus, rheumatoid arthritis, and giardiasis.

hydroxychloroquine sulfate

Apo-Hydroxychloroquine (CA), Gen-Hydroxychloroquine (CA), Plaquenil

Pharmacologic class: 4-aminoquinolone

Therapeutic class: Antimalarial, antirheumatic, anti-inflammatory (disease-modifying)

Pregnancy risk category C

FDA Box Warning

• Familiarize yourself completely with contents of the manufacturer's package insert before administering or prescribing this drug.


Unknown. Thought to interfere with inhibition of protein synthesis and DNA replication, leading to parasitic death.


Tablets: 200 mg (155 mg base); 200 mg hydroxychloroquine sulfate is equivalent to 155 mg of hydroxychloroquine base

Indications and dosages

Malaria prophylaxis (dosages expressed as mg of base)

Adults: 310 mg P.O. q week, starting 1 to 2 weeks before entering endemic area and continuing for 4 weeks after leaving area

Children: 5 mg/kg P.O. q week, starting 1 to 2 weeks before entering endemic area and continuing for 4 weeks after leaving area

Acute malarial attack (dosages expressed as mg of base)

Adults: Initially, 620 mg P.O., then 310 mg 6 hours, 24 hours, and 48 hours later

Children: Initially, 10 mg/kg P.O., then 5 mg/kg 6 hours, 24 hours, and 48 hours later

Rheumatoid arthritis

Adults: 400 to 600 mg/day P.O. for 4 to 12 weeks, then reduced by 50%

Systemic lupus erythematosus

Adults: 400 mg P.O. once or twice daily for several months, then reduced to 200 to 400 mg daily, depending on response


• Hypersensitivity to drug or chloroquine
• Retinal or visual field changes
• Long-term therapy in children


Use cautiously in:
• hepatic or renal impairment, G6PD deficiency, psoriasis, bone marrow depression, alcoholism
• obese patients
• pregnant or breastfeeding patients
• children.


• Give with food or milk.
• For malaria prophylaxis, schedule doses on same day each week.

Adverse reactions

CNS: anxiety, apathy, confusion, fatigue, headache, psychoses, mood swings, irritability, neuromyopathy, peripheral neuritis, seizures

CV: ECG changes, hypotension

EENT: visual disturbances, retinopathy, keratopathy, ototoxicity, tinnitus

GI: nausea, vomiting, diarrhea, abdominal cramps, anorexia

Hematologic: leukopenia, agranulocytosis, aplastic anemia, thrombocytopenia

Hepatic: jaundice, hepatotoxicity

Musculoskeletal: muscle weakness

Skin: dermatoses, rash, pruritus, pigmentation changes, pleomorphic skin eruption, worsened psoriasis, alopecia, bleaching of hair

Other: weight loss


Drug-diagnostic tests.Granulocytes, hemoglobin, platelets: decreased values

Drug-behaviors.Sun exposure: exacerbation of drug-induced dermatoses

Patient monitoring

Monitor for signs and symptoms of overdose, such as nausea, vomiting, drowsiness, visual disturbances, cardiovascular collapse, and seizures.
• Watch for adverse reactions.

Patient teaching

• Advise patient to take with food or milk.

Instruct patient to immediately report such adverse reactions as vision changes, nausea, vomiting, drowsiness, mental changes, mood swings, headache, ringing in ears, muscle weakness, rash, bleeding, bruising, and yellowing of skin and eyes.
• In long-term therapy, advise patient to have regular eye exams.
• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, and behaviors mentioned above.


A trademark for the drug hydroxychloroquine sulfate.

Plaquenil ®

Hydroxychloroquine sulfate, see there.


References in periodicals archive ?
She is still needing plaquenil and sulfasalazine to maintain her current status, but when she feels a flare coming on, she mitigates the flare and symptoms via a stringent juice fast or anti-inflammatory diet and transiently increases her anti-inflammatory supplements under my supervision.
For Babesia, Mepron, macrolides, Plaquenil, Artemisinin, or Bactrim may be helpful.
Six months later she remains symptom free on 5 mg of prednisone and Plaquenil 400 mg daily.
In addition, patients on Benlysta tend to use significantly less Plaquenil, NSAIDs, and CellCept than non-Benlysta users.
Over the course of three years, he received intravenous antibiotics that included Rocephin, Merrem, Zithromax, Plaquenil, Claforan, Amoxycillin, Doxycyclin, and supportive nutritional supplements.
While surveyed rheumatologists suggest that Benlysta is most likely to replace Rituxan or Cytoxan, actual patient origination in close to 60% of Benlysta patients have been following Plaquenil failure or a single immunosuppressant failure.
Key products are Nilandron, for the treatment of metastatic prostate cancer; Dibenzyline, for the treatment of pheochromocytoma; Lanoxin, for the treatment of mild-to-moderate heart failure and atrial fibrillation; and, Plaquenil, for the treatment of lupus and rheumatoid arthritis.
Current products include Plaquenil, Nilandron, Rilutek, Uroxatral, Lanoxin, Fortaz, Zantac, Zinacef and Parnate.
Drugs Include Nilandron, Plaquenil, Rilutek, Uroxatral, and Kayexalate