Chloroquine is a medication used to prevent and to treat malaria in areas where malaria is known to be sensitive to its effects. Certain types of malaria, resistant strains, and complicated cases typically require different or additional medication. It is also occasionally used for amebiasis that is occurring outside the intestines, rheumatoid arthritis, and lupus erythematosus. It is taken by mouth.
|Trade names||Aralen, others|
|Elimination half-life||1–2 months|
|CompTox Dashboard (EPA)|
|Chemical and physical data|
|Molar mass||319.872 g/mol g·mol−1|
|3D model (JSmol)|
Common side effects include muscle problems, loss of appetite, diarrhea, and skin rash. Serious side effects include problems with vision, muscle damage, seizures, and low blood cell levels. It appears to be safe for use during pregnancy. Chloroquine is a member of the drug class 4-aminoquinoline. It works against the asexual form of malaria inside the red blood cell.
Chloroquine was discovered in 1934 by Hans Andersag. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. It is available as a generic medication. The wholesale cost in the developing world is about US$0.04. In the United States, it costs about US$5.30 per dose.
Chloroquine has long been used in the treatment or prevention of malaria from Plasmodium vivax, P. ovale, and P. malariae, excluding the malaria parasite Plasmodium falciparum, for it started to develop widespread resistance to it.
Chloroquine has been extensively used in mass drug administrations, which may have contributed to the emergence and spread of resistance. It is recommended to check if chloroquine is still effective in the region prior to using it. In areas where resistance is present, other antimalarials, such as mefloquine or atovaquone, may be used instead. The Centers for Disease Control and Prevention recommend against treatment of malaria with chloroquine alone due to more effective combinations.
In treatment of amoebic liver abscess, chloroquine may be used instead of or in addition to other medications in the event of failure of improvement with metronidazole or another nitroimidazole within 5 days or intolerance to metronidazole or a nitroimidazole.
- Deafness or tinnitus.
- Nausea, vomiting, diarrhea, abdominal cramps, and anorexia.
- Mild and transient headache.
- Skin itchiness, skin color changes, hair loss, and skin rashes.
- Chloroquine-induced itching is very common among black Africans (70%), but much less common in other races. It increases with age, and is so severe as to stop compliance with drug therapy. It is increased during malaria fever; its severity is correlated to the malaria parasite load in blood. Some evidence indicates it has a genetic basis and is related to chloroquine action with opiate receptors centrally or peripherally.
- Unpleasant metallic taste
- This could be avoided by ‘taste-masked and controlled release’ formulations such as multiple emulsions.
- Chloroquine retinopathy
- May be irreversible. This occurs with long-term use over many years or with high doses. Patients on long-term chloroquine therapy should be screened at baseline and then annually after five years of use. The daily safe maximum doses for eye toxicity can be computed from one's height and weight using this calculator. Patients should be screened for vision changes such as blurring of vision, difficulty focusing, or seeing half an object.
- Hypotension and electrocardiographic changes
- This manifests itself as either conduction disturbances (bundle-branch block, atrioventricular block) or cardiomyopathy – often with hypertrophy, restrictive physiology, and congestive heart failure. The changes may be irreversible. Only two cases have been reported requiring heart transplantation, suggesting this particular risk is very low. Electron microscopy of cardiac biopsies show pathognomonic cytoplasmic inclusion bodies.
- Pancytopenia, aplastic anemia, reversible agranulocytosis, low blood platlets, neutropenia.
Chloroquine has not been shown to have any harmful effects on the fetus when used for malarial prophylaxis. Small amounts of chloroquine are excreted in the breast milk of lactating women. However, because this drug can be safely prescribed to infants, the effects are not harmful. Studies with mice show that radioactively tagged chloroquine passed through the placenta rapidly and accumulated in the fetal eyes which remained present five months after the drug was cleared from the rest of the body. It is still advised to prevent women who are pregnant or planning on getting pregnant from traveling to malaria-risk regions.
There is not enough evidence to determine whether chloroquine is safe to be given to people aged 65 and older. However, the drug is cleared by the kidneys and toxicity should be monitored carefully in people with poor kidney functions.
- Antacids- may reduce absorption of chloroquine
- Kaolin- may reduce absorption of chloroquine
- Cimetidine- may inhibit metabolism of chloroquine; increasing levels of chloroquine in the body
- Ampicillin- levels may be reduced by chloroquine
- Cyclosporine- levels may be increased by chloroquine
- Mefloquine- may increase risk of convulsions
Chloroquine is very dangerous in overdose. It is rapidly absorbed from the gut. In 1961, published studies showed three children who took overdoses died within 2.5 hours of taking the drug. While the amount of the overdose was not cited, the therapeutic index for chloroquine is known to be small. Symptoms of overdose include headache, drowsiness, visual disturbances, nausea and vomiting, cardiovascular collapse, seizures, and sudden respiratory and cardiac arrest.
A metabolite of chloroquine – hydroxychloroquine – has a long half-life (32–56 days) in blood and a large volume of distribution (580–815 L/kg). The therapeutic, toxic and lethal ranges are usually considered to be 0.03 to 15 mg/l, 3.0 to 26 mg/l and 20 to 104 mg/l, respectively. However, nontoxic cases have been reported up to 39 mg/l, suggesting individual tolerance to this agent may be more variable than previously recognised.
Resistance in malariaEdit
Since the first documentation of P. falciparum chloroquine resistance in the 1950s, resistant strains have appeared throughout East and West Africa, Southeast Asia, and South America. The effectiveness of chloroquine against P. falciparum has declined as resistant strains of the parasite evolved. They effectively neutralize the drug via a mechanism that drains chloroquine away from the digestive vacuole. Chloroquine-resistant cells efflux chloroquine at 40 times the rate of chloroquine-sensitive cells; the related mutations trace back to transmembrane proteins of the digestive vacuole, including sets of critical mutations in the P. falciparum chloroquine resistance transporter (PfCRT) gene. The mutated protein, but not the wild-type transporter, transports chloroquine when expressed in Xenopus oocytes and is thought to mediate chloroquine leak from its site of action in the digestive vacuole. Resistant parasites also frequently have mutated products of the ABC transporter P. falciparum multidrug resistance (PfMDR1) gene, although these mutations are thought to be of secondary importance compared to Pfcrt. Verapamil, a Ca2+ channel blocker, has been found to restore both the chloroquine concentration ability and sensitivity to this drug. Recently, an altered chloroquine-transporter protein CG2 of the parasite has been related to chloroquine resistance, but other mechanisms of resistance also appear to be involved. Research on the mechanism of chloroquine and how the parasite has acquired chloroquine resistance is still ongoing, as other mechanisms of resistance are likely.
- Absorption: Rapid and almost completely
- Distribution: Widely distributed into body tissues
- Protein binding: 55%
- Metabolism: Partially hepatic to main metabolite, desethylchloroquine
- Excretion: Urine (≥50% as unchanged drug); acidification of urine increases elimination
Chloroquine has a very high volume of distribution, as it diffuses into the body's adipose tissue. Chloroquine and related quinines have been associated with cases of retinal toxicity, particularly when provided at higher doses for longer times. Accumulation of the drug may result in deposits that can lead to blurred vision and blindness. With long-term doses, routine visits to an ophthalmologist are recommended.
Chloroquine is also a lysosomotropic agent, meaning it accumulates preferentially in the lysosomes of cells in the body. The pKa for the quinoline nitrogen of chloroquine is 8.5, meaning it is about 10% deprotonated at physiological pH as calculated by the Henderson-Hasselbalch equation. This decreases to about 0.2% at a lysosomal pH of 4.6. Because the deprotonated form is more membrane-permeable than the protonated form, a quantitative "trapping" of the compound in lysosomes results. (A quantitative treatment of this phenomenon involves the pKas of all nitrogens in the molecule; this treatment, however, suffices to show the principle.)
The lysosomotropic character of chloroquine is believed to account for much of its antimalarial activity; the drug concentrates in the acidic food vacuole of the parasite and interferes with essential processes. Its lysosomotropic properties further allow for its use for in vitro experiments pertaining to intracellular lipid related diseases, autophagy, and apoptosis.
Mechanism of actionEdit
Inside red blood cells, the malarial parasite, which is then in its asexual lifecycle stage, must degrade hemoglobin to acquire essential amino acids, which the parasite requires to construct its own protein and for energy metabolism. Digestion is carried out in a vacuole of the parasitic cell.
Hemoglobin is composed of a protein unit (digested by the parasite) and a heme unit (not used by the parasite). During this process, the parasite releases the toxic and soluble molecule heme. The heme moiety consists of a porphyrin ring called Fe(II)-protoporphyrin IX (FP). To avoid destruction by this molecule, the parasite biocrystallizes heme to form hemozoin, a nontoxic molecule. Hemozoin collects in the digestive vacuole as insoluble crystals.
Chloroquine enters the red blood cell, inhibiting the parasite cell and digestive vacuole by simple diffusion. Chloroquine then becomes protonated (to CQ2+), as the digestive vacuole is known to be acidic (pH 4.7); chloroquine then cannot leave by diffusion. Chloroquine caps hemozoin molecules to prevent further biocrystallization of heme, thus leading to heme buildup. Chloroquine binds to heme (or FP) to form the FP-chloroquine complex; this complex is highly toxic to the cell and disrupts membrane function. Action of the toxic FP-chloroquine and FP results in cell lysis and ultimately parasite cell autodigestion. In essence, the parasite cell drowns in its own metabolic products. Parasites that do not form hemozoin are therefore resistant to chloroquine.
Against rheumatoid arthritis, it operates by inhibiting lymphocyte proliferation, phospholipase A2, antigen presentation in dendritic cells, release of enzymes from lysosomes, release of reactive oxygen species from macrophages, and production of IL-1.
Brand names include Chloroquine FNA, Resochin, and Dawaquin.
Chloroquine was discovered in 1934 by Hans Andersag and coworkers at the Bayer laboratories, who named it "Resochin". It was ignored for a decade because it was considered too toxic for human use. During World War II, United States government-sponsored clinical trials for antimalarial drug development showed unequivocally that chloroquine has a significant therapeutic value as an antimalarial drug. It was introduced into clinical practice in 1947 for the prophylactic treatment of malaria.
- Chloroquine is in clinical trials as an investigational antiretroviral in humans with HIV-1/AIDS and is being considered in pre-clinical models as a potential antiviral agent against chikungunya fever.
- The radiosensitizing and chemosensitizing properties of chloroquine are beginning to be exploited in anticancer strategies in humans.
- In biomedicinal science, chloroquine is used for in vitro experiments to inhibit lysosomal degradation of protein products.
- "Aralen Phosphate". The American Society of Health-System Pharmacists. Archived from the original on 8 December 2015. Retrieved 2 December 2015.
- "Chloroquine Use During Pregnancy". Drugs.com. Retrieved 16 April 2019.
There are no controlled data in human pregnancies.
- Zumla, edited by Gordon C. Cook, Alimuddin I. (2009). Manson's tropical diseases (22nd ed.). [Edinburgh]: Saunders. p. 1240. ISBN 9781416044703. Archived from the original on 8 December 2015.CS1 maint: Extra text: authors list (link)
- Bhattacharjee, Mrinal (2016). Chemistry of Antibiotics and Related Drugs. Springer. p. 184. ISBN 9783319407463. Archived from the original on 1 November 2016.
- "WHO Model List of Essential Medicines (19th List)" (PDF). World Health Organization. April 2015. Archived (PDF) from the original on 13 December 2016. Retrieved 8 December 2016.
- "Chloroquine (Base)". International Drug Price Indicator Guide. Retrieved 4 December 2015.
- Plowe CV (2005). "Antimalarial drug resistance in Africa: strategies for monitoring and deterrence". Curr. Top. Microbiol. Immunol. Current Topics in Microbiology and Immunology. 295: 55–79. doi:10.1007/3-540-29088-5_3. ISBN 3-540-25363-7. PMID 16265887.
- Uhlemann AC, Krishna S (2005). "Antimalarial multi-drug resistance in Asia: mechanisms and assessment". Curr. Top. Microbiol. Immunol. Current Topics in Microbiology and Immunology. 295: 39–53. doi:10.1007/3-540-29088-5_2. ISBN 3-540-25363-7. PMID 16265886.
- "DailyMed - CHLOROQUINE- chloroquine phosphate tablet CHLOROQUINE- chloroquine phosphate tablet, coated". dailymed.nlm.nih.gov. Archived from the original on 8 December 2015. Retrieved 4 November 2015.
- CDC. Health information for international travel 2001–2002. Atlanta, Georgia: U.S. Department of Health and Human Services, Public Health Service, 2001.
- Amebic Hepatic Abscesses~treatment at eMedicine
- "DailyMed - CHLOROQUINE- chloroquine phosphate tablet CHLOROQUINE- chloroquine phosphate tablet, coated". dailymed.nlm.nih.gov. Archived from the original on 8 December 2015. Retrieved 3 November 2015.
- Ajayi AA (September 2000). "Mechanisms of chloroquine-induced pruritus". Clin. Pharmacol. Ther. 68 (3): 336. PMID 11014416.
- Vaziri, A.; Warburton, B. (1994). "Slow release of chloroquine phosphate from multiple taste-masked W/O/W multiple emulsions". Journal of Microencapsulation. 11 (6): 641–8. doi:10.3109/02652049409051114. PMID 7884629.
- Michaelides, Michel (2011). "Retinal Toxicity Associated With Hydroxychloroquine and Chloroquine". Archives of Ophthalmology. 129 (1): 30–9. doi:10.1001/archophthalmol.2010.321. PMID 21220626.
- "Determine the safe dose of medicins: Chloroquine and Hydroxychloroquine (Plaquenil)". Archived from the original on 6 September 2015.[unreliable source?]
- Tönnesmann, Ernst; Kandolf, Reinhard; Lewalter, Thorsten (2013). "Chloroquine cardiomyopathy – a review of the literature". Immunopharmacology and Immunotoxicology. 35 (3): 434–42. doi:10.3109/08923973.2013.780078. PMID 23635029.
- "ARALEN® CHLOROQUINE PHOSPHATE, USP" (PDF). Archived (PDF) from the original on 8 December 2015. Retrieved 5 November 2015.
- "Malaria - Chapter 3 - 2016 Yellow Book | Travelers' Health | CDC". wwwnc.cdc.gov. Archived from the original on 14 January 2016. Retrieved 11 November 2015.
- Ullberg S, Lindquist NG, Sjòstrand SE (September 1970). "Accumulation of chorioretinotoxic drugs in the foetal eye". Nature. 227: 1257–8. doi:10.1038/2271257a0. PMID 5452818.
- Cann, Howard M.; Verhulst, Henry L. (1961). "Fatal acute chloroquine poisoning in children". Pediatrics. 27: 95–102. PMID 13690445.
- Molina, D. Kimberley (2012). "Postmortem Hydroxychloroquine Concentrations in Nontoxic Cases". The American Journal of Forensic Medicine and Pathology. 33 (1): 41–2. doi:10.1097/PAF.0b013e3182186f99. PMID 21464694.
- Martin, R. E.; Marchetti, R. V.; Cowan, A. I.; Howitt, S. M.; Broer, S.; Kirk, K. (2009). "Chloroquine Transport via the Malaria Parasite's Chloroquine Resistance Transporter". Science. 325 (5948): 1680–2. Bibcode:2009Sci...325.1680M. doi:10.1126/science.1175667. PMID 19779197.
- Essentials of medical pharmacology fifth edition 2003, reprint 2004, published by-Jaypee Brothers Medical Publisher Ltd, 2003, KD Tripathi, pages 739,740.
- Alcantara, Laura M.; Kim, Junwon; Moraes, Carolina B.; Franco, Caio H.; Franzoi, Kathrin D.; Lee, Sukjun; Freitas-Junior, Lucio H.; Ayong, Lawrence S. (2013). "Chemosensitization potential of P-glycoprotein inhibitors in malaria parasites". Experimental Parasitology. 134 (2): 235–43. doi:10.1016/j.exppara.2013.03.022. PMID 23541983.
- Chen, Patrick M; Gombart, Zoë J; Chen, Jeff W (2011). "Chloroquine treatment of ARPE-19 cells leads to lysosome dilation and intracellular lipid accumulation: possible implications of lysosomal dysfunction in macular degeneration". Cell & Bioscience. 1 (1): 10. doi:10.1186/2045-3701-1-10. PMC 3125200. PMID 21711726.
- Kurup, Pradeep; Zhang, Yongfang; Xu, Jian; Venkitaramani, Deepa V.; Haroutunian, Vahram; Greengard, Paul; Nairn, Angus C.; Lombroso, Paul J. (2010). "Aβ-Mediated NMDA Receptor Endocytosis in Alzheimer's Disease Involves Ubiquitination of the Tyrosine Phosphatase STEP61". Journal of Neuroscience. 30 (17): 5948–57. doi:10.1523/JNEUROSCI.0157-10.2010. PMC 2868326. PMID 20427654.
- Kim, Ella L.; Wüstenberg, Robin; Rübsam, Anne; Schmitz-Salue, Christoph; Warnecke, Gabriele; Bucker, Eva-Maria; Pettkus, Nadine; Speidel, Daniel; Rohde, Veit; Schulz-Schaeffer, Walter; Deppert, Wolfgang; Giese, Alf (2010). "Chloroquine activates the p53 pathway and induces apoptosis in human glioma cells". Neuro-Oncology. 12 (4): 389–400. doi:10.1093/neuonc/nop046. PMC 2940600. PMID 20308316.
- Hempelmann E. (2007). "Hemozoin biocrystallization in Plasmodium falciparum and the antimalarial activity of crystallization inhibitors". Parasitol Research. 100 (4): 671–676. doi:10.1007/s00436-006-0313-x. PMID 17111179.
- Lin JW, Spaccapelo R, Schwarzer E, et al. (2015). "Replication of Plasmodium in reticulocytes can occur without hemozoin formation, resulting in chloroquine resistance" (PDF). J Exp Med. 212: 893–903. doi:10.1084/jem.20141731. PMC 4451122. PMID 25941254.
- Liu, Jun; Huang, Zhiwei; Srinivasan, Sankaranarayanan; Zhang, Jianhuai; Chen, Kaifu; Li, Yongxiang; Li, Wei; Quiocho, Florante A.; Pan, Xuewen (2012). "Discovering Thiamine Transporters as Targets of Chloroquine Using a Novel Functional Genomics Strategy". PLoS Genetics. 8 (11): e1003083. doi:10.1371/journal.pgen.1003083. PMC 3510038. PMID 23209439.
- Krafts, Kristine; Hempelmann, Ernst; Skórska-Stania, Agnieszka (2012). "From methylene blue to chloroquine: a brief review of the development of an antimalarial therapy". Parasitology Research. 111 (1): 1–6. doi:10.1007/s00436-012-2886-x. PMID 22411634.
- "The History of Malaria, an Ancient Disease". Centers for Disease Control. Archived from the original on 28 August 2010.
- Savarino A, Boelaert JR, Cassone A, Majori G, Cauda R (November 2003). "Effects of chloroquine on viral infections: an old drug against today's diseases?". Lancet Infect Dis. 3 (11): 722–7. doi:10.1016/S1473-3099(03)00806-5. PMID 14592603.
- Savarino A, Lucia MB, Giordano F, Cauda R (October 2006). "Risks and benefits of chloroquine use in anticancer strategies". Lancet Oncol. 7 (10): 792–3. doi:10.1016/S1470-2045(06)70875-0. PMID 17012039.
- Sotelo J, Briceño E, López-González MA (March 2006). "Adding chloroquine to conventional treatment for glioblastoma multiforme: a randomized, double-blind, placebo-controlled trial". Ann. Intern. Med. 144 (5): 337–43. doi:10.7326/0003-4819-144-5-200603070-00008. PMID 16520474.
"Summaries for patients. Adding chloroquine to conventional chemotherapy and radiotherapy for glioblastoma multiforme". Ann. Intern. Med. 144 (5): I31. March 2006. doi:10.7326/0003-4819-144-5-200603070-00004. PMID 16520470.